What is polygonum doing posting at this silly time? Well €“ I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft €“ which I expect to get
louder and then fade away €“ but it just continues.

For a while I think it is the fridge or the freezer €“ but investigation,
even switching them off, doesnt change the sound. Or the central
heating. Or the gas or electric meters. Or the router. Or the printer.
Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment
the environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours €“ maybe days.
(Funny, you really notice it is there but not when it disappears so it
is difficult to keep track of.)

Oh €“ and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret €“ at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft,
birds, rain, wind, cats, CFLs, hum from battery chargers, and on and on.
This is the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.
snip

It's the blood inside yer head................

Lobotomy would cure it.

RW wrote:
http://en.wikipedia.org/wiki/The_Hum
For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.
snip

It's the blood inside yer head................

Lobotomy would cure it.



And in the spirit of uk.d-i-y I would wish to follow the great Phnieas
Gauge [1] in doing my own. But homemade explosives are somewhat frowned
on in the UK these days. Especially in High Wycombe. So I guess is it is
the Bosch [2] with a hole cutter to get started...

[1] http://en.wikipedia.org/wiki/Phineas_Gage
[2] http://news.bbc.co.uk/1/hi/health/7308077.stm
--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

On Thu, 29 May 2008 05:46:24 +0100, Rod
wrote:

[snip]

House mains electricity?

Geoff wrote:
On Thu, 29 May 2008 05:46:24 +0100, Rod
wrote:

[snip]

House mains electricity?

Actually it was in oart the fact of the power cut on Tuesday that
triggered my post. I was sitting here thinking that if there was a power
cut now, I would be able to categorically eliminate that. But, in truth,
I am as sure as I can be that it is not.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

Rod wrote:
What is polygonum doing posting at this silly time? Well €“ I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft €“ which I expect to get
louder and then fade away €“ but it just continues.

For a while I think it is the fridge or the freezer €“ but investigation,
even switching them off, doesnt change the sound. Or the central
heating. Or the gas or electric meters. Or the router. Or the printer.
Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment
the environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours €“ maybe days.
(Funny, you really notice it is there but not when it disappears so it
is difficult to keep track of.)

Oh €“ and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret €“ at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft,
birds, rain, wind, cats, CFLs, hum from battery chargers, and on and on.
This is the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.


Flick the whole electricity system off.

That will at least identify whether it is something electrical on your
circuit.

Rod wrote:

What is polygonum doing posting at this silly time? Well €“ I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft €“ which I expect to get
louder and then fade away €“ but it just continues.

For a while I think it is the fridge or the freezer €“ but investigation,
even switching them off, doesnt change the sound. Or the central
heating. Or the gas or electric meters. Or the router. Or the printer.
Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

A few months ago I was trying to trace the source of some interference
to MW radio. Being unable to locate a source indoors or nearby
outside, I turned the electricity off at the main switch. What
surprised me was how 'dead' the house was with no electicity, although
there were no pervasive noises before doing so. Perhaps next time
you're awake with this problem, just kill the mains and see what
happens. At least it will tell you if the problem lies in your own
home....

"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central heating.
Or the gas or electric meters. Or the router. Or the printer. Or the
ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in one
room than another. And maybe it is a little. But I hear it everywhere and
am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment the
environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days. (Funny,
you really notice it is there but not when it disappears so it is
difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft, birds,
rain, wind, cats, CFLs, hum from battery chargers, and on and on. This is
the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

I'll be keeping tabs on this thread - my hum is outside.
I've traipsed the streets at night and the hum always seems to be just
around the corner, once I get around the corner it seems to be coming from
the next corner and so on - I'll end up at Lands End eventually.
The Missus sometimes claims that she hears it but is well able to sleep
through it so I suffer alone mostly.
Franko.

On Thu, 29 May 2008 06:36:41 +0100, "RW" wrote:


http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.
snip

It's the blood inside yer head................

Lobotomy would cure it.

I'd rather have a full bottle in front of me than a full frontal
lobotomy.

--
Frank Erskine

"Terry Fields" wrote in message
...

Rod wrote:

What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central
heating. Or the gas or electric meters. Or the router. Or the printer.
Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

A few months ago I was trying to trace the source of some interference
to MW radio. Being unable to locate a source indoors or nearby
outside, I turned the electricity off at the main switch. What
surprised me was how 'dead' the house was with no electicity, although
there were no pervasive noises before doing so. Perhaps next time
you're awake with this problem, just kill the mains and see what
happens. At least it will tell you if the problem lies in your own
home....


As others have said, first kill your entire house by knocking off the main
trip switch on your consumer unit. The only place within your house that any
hum could then be coming from, is the electricity meter. With no current
being drawn through it, it is highly unlikely that it could be that,
however, it *is* inside your house (or garage or in its lttle box on the
wall outside), and it *is* the very first thing on your property's circuit.

If killing the whole consumer unit gets rid of the noise, you then need to
isolate each individual circuit i.e. upstairs ring, downstairs ring,
upstairs lights, downstairs lights, cooker, immersion heater and so on, by
popping breakers or pulling fuses one at a time.

Sources of hum are anything with a mains transformer in, or anything with a
motor in. Occasionally, heater elements will hum as the resistance wire
inside 'rattles' at 50Hz due to the magnetic field that is generated by the
passage of current through the element, interacting with the element
sheathing or mounting. Hence why your toaster hums.

Candidates might be something in the loft that you've forgotton about - a TV
distribution amplifier perhaps - an immersion heater, an electromechanical
timeclock for central heating, a transformer within the central heating
boiler that's part of the power supply for its control electronics, the
power supply for a cordless phone or answer machine, even a lightbulb can
sometimes hum.

By applying a logical approach to the problem, it shouldn't be that hard to
track down. Good luck with it !

Arfa

On Thu, 29 May 2008 05:46:24 +0100, Rod wrote:

What is polygonum doing posting at this silly time? Well €“ I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

snip


It may be an idea to check with your neighbour if you live in an
adjoining house. Sometimes something like a bell transformer can do
similar things if it is screwed to the other side of a wall. The wall
acts as a sounding board.

--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.info http://mixpix.batcave.net
Filtering everything posted from googlegroups to kill spam.

Rod wrote:
Geoff wrote:
On Thu, 29 May 2008 05:46:24 +0100, Rod
wrote:

[snip]

House mains electricity?

Actually it was in oart the fact of the power cut on Tuesday that
triggered my post. I was sitting here thinking that if there was a
power cut now, I would be able to categorically eliminate that. But,
in truth, I am as sure as I can be that it is not.

Easy enough to eliminate without waiting for a powercut though. Just turn
it off.

Have you thought about noises from the pipework? Occasionally a ballcock
can cause groaning noises. Try turning off your water. While you at it,
turn the gas off as well, then you'll have eliminated all the services. ;-)

Tim

Arfa Daily wrote:
"Terry Fields" wrote in message
...
Rod wrote:

What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central
heating. Or the gas or electric meters. Or the router. Or the printer.
Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.
A few months ago I was trying to trace the source of some interference
to MW radio. Being unable to locate a source indoors or nearby
outside, I turned the electricity off at the main switch. What
surprised me was how 'dead' the house was with no electicity, although
there were no pervasive noises before doing so. Perhaps next time
you're awake with this problem, just kill the mains and see what
happens. At least it will tell you if the problem lies in your own
home....


As others have said, first kill your entire house by knocking off the main
trip switch on your consumer unit. The only place within your house that any
hum could then be coming from, is the electricity meter. With no current
being drawn through it, it is highly unlikely that it could be that,
however, it *is* inside your house (or garage or in its lttle box on the
wall outside), and it *is* the very first thing on your property's circuit.

If killing the whole consumer unit gets rid of the noise, you then need to
isolate each individual circuit i.e. upstairs ring, downstairs ring,
upstairs lights, downstairs lights, cooker, immersion heater and so on, by
popping breakers or pulling fuses one at a time.

Sources of hum are anything with a mains transformer in, or anything with a
motor in. Occasionally, heater elements will hum as the resistance wire
inside 'rattles' at 50Hz due to the magnetic field that is generated by the
passage of current through the element, interacting with the element
sheathing or mounting. Hence why your toaster hums.

Candidates might be something in the loft that you've forgotton about - a TV
distribution amplifier perhaps - an immersion heater, an electromechanical
timeclock for central heating, a transformer within the central heating
boiler that's part of the power supply for its control electronics, the
power supply for a cordless phone or answer machine, even a lightbulb can
sometimes hum.

By applying a logical approach to the problem, it shouldn't be that hard to
track down. Good luck with it !


Drat - I thought the night storage heaters were supposed to be connected
before the meter. That's what the man at the pub told me when he
connected them up. Isn't that what is economical about Economy 7? :-)

I shall try switching off at a convenient time. One of the problems is
that the sound comes and goes - sometimes just a few minutes at a time,
sometimes hour after weary hour. So even if I can't hear it, doesn't
mean it ain't coming back. :-(

Although I have a lousy sense of pitch, I get the feeling, like in the
Wiki article where they mention 56 Hz, that the sound is just a touch
higher than 50 Hz. (Perhaps the grid people are trying to recover the
hertzes they lost on Tuesday?)

Thank you for all the responses.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central heating.
Or the gas or electric meters. Or the router. Or the printer. Or the
ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in one
room than another. And maybe it is a little. But I hear it everywhere and
am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment the
environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days. (Funny,
you really notice it is there but not when it disappears so it is
difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft, birds,
rain, wind, cats, CFLs, hum from battery chargers, and on and on. This is
the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.


I fear it may be tinnitus related - as you will know, changes in background
noise and acoustics (eg out and inside) can change the perception of
tinnitus markedly. I had tinnitus for a while (year or so) and it's sh*t.
Mine was a ~2kHz tone though, so easy to be sure it wasn't other things.
Fortunately my condition arrested and the tinnitus went in the end although
I am left with some conductive hearing loss. The Wikipedia article
referenced mentions this explanation. A decent set of ear defenders would
rule out air borne noise, at least, if the hum is still present.


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not) --
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

On Thu, 29 May 2008 05:46:24 +0100, Rod wrote:

What is polygonum doing posting at this silly time? Well ¡V I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

BTDTGTTS.

Quite a few years ago I was asked to investigate a strange hum that a woman
was hearing. She lived in a village just outside Andover, Hants.

She claimed it was electrical, or it could be water-borne, or it could
be......

To cut a long, long story short, several visits, sitting listening intently
trying to 'hear' this sound - 'Ah, yes; I think I can hear it now. No, no,
it's gone again!' - it was finally identified as the fans at a nearby
slaughterhouse, about 1/2 mile away across the open fields between her
cottage and said slaughterhouse.

Then there was another one, an old cottage, with some internal walls made
out of t&g timber. The meter had been fixed to one of these walls, which
appeared to have a natural resonance round about 50hz. The din was quite
astonishing. Moved the meter round onto an adjacent brick wall, noise gone.

Then there was the old boy who reckoned he could see, hear and catch
'whirls of that electric' dropping off the wires. Just hoped he was using a
rubber bucket to catch them.......

--
the dot wanderer at tesco dot net

Bob Mannix wrote:

I fear it may be tinnitus related - as you will know, changes in background
noise and acoustics (eg out and inside) can change the perception of
tinnitus markedly. I had tinnitus for a while (year or so) and it's sh*t.
Mine was a ~2kHz tone though, so easy to be sure it wasn't other things.
Fortunately my condition arrested and the tinnitus went in the end although
I am left with some conductive hearing loss. The Wikipedia article
referenced mentions this explanation. A decent set of ear defenders would
rule out air borne noise, at least, if the hum is still present.

They aren't so good at cuting out really low-frequency noises. Perhaps
trying a pair of noise-cancelling earphones/earbuds might help?

Bob Mannix wrote:
"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central heating.
Or the gas or electric meters. Or the router. Or the printer. Or the
ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in one
room than another. And maybe it is a little. But I hear it everywhere and
am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment the
environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days. (Funny,
you really notice it is there but not when it disappears so it is
difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft, birds,
rain, wind, cats, CFLs, hum from battery chargers, and on and on. This is
the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.


I fear it may be tinnitus related - as you will know, changes in background
noise and acoustics (eg out and inside) can change the perception of
tinnitus markedly. I had tinnitus for a while (year or so) and it's sh*t.
Mine was a ~2kHz tone though, so easy to be sure it wasn't other things.
Fortunately my condition arrested and the tinnitus went in the end although
I am left with some conductive hearing loss. The Wikipedia article
referenced mentions this explanation. A decent set of ear defenders would
rule out air borne noise, at least, if the hum is still present.


My 'normal' bilateral tinnitus is, I guess, somewhere in the 14+ KHz
range. Annoying I can't even hear that in real sound - though I can hear
a bit above 12 KHz. I have had it for around 43 years so am somewhat
used to it - not every hour of every day - it has become progressively
worse. It is now often the loudest thing around to me unless television
or radio is blaring. What puts me off from this being the cause is a) I
don't get the hum outside b) I don't get the hum anywhere else. But I do
carry the tinnitus everywhere.

Funnily enough, I do actually find it nice to read that someone's
tinnitus has disappeared. I am glad for you.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

"Rod" wrote in message
...
Bob Mannix wrote:
"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central
heating. Or the gas or electric meters. Or the router. Or the printer.
Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment
the environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days.
(Funny, you really notice it is there but not when it disappears so it
is difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft,
birds, rain, wind, cats, CFLs, hum from battery chargers, and on and on.
This is the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.


I fear it may be tinnitus related - as you will know, changes in
background noise and acoustics (eg out and inside) can change the
perception of tinnitus markedly. I had tinnitus for a while (year or so)
and it's sh*t. Mine was a ~2kHz tone though, so easy to be sure it wasn't
other things. Fortunately my condition arrested and the tinnitus went in
the end although I am left with some conductive hearing loss. The
Wikipedia article referenced mentions this explanation. A decent set of
ear defenders would rule out air borne noise, at least, if the hum is
still present.


My 'normal' bilateral tinnitus is, I guess, somewhere in the 14+ KHz
range. Annoying I can't even hear that in real sound - though I can hear a
bit above 12 KHz. I have had it for around 43 years so am somewhat used to
it - not every hour of every day - it has become progressively worse. It
is now often the loudest thing around to me unless television or radio is
blaring. What puts me off from this being the cause is a) I don't get the
hum outside b) I don't get the hum anywhere else. But I do carry the
tinnitus everywhere.

Funnily enough, I do actually find it nice to read that someone's tinnitus
has disappeared. I am glad for you.


So was I! Difficult to explain to others what it's like. At least I have a
small inkling of what it must be for you - I feel for you and thank my lucky
stars mine went. Mine was [almost certainly] caused by a bout of
Otosclerosis (bone growing over the eardrum), or at least they had a common
cause, along with dizzy spells (think buildings apparently moving like cross
channel ferries) and conductive hearing loss. Usually progressive but mine
stopped for some reason. Chatting to people - fine. Sitting alone on top of
a mountain or lying in bed at night, the bloody noise emerges out of the
background to dominate. Insistently.


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)

Bob Mannix wrote:

So was I! Difficult to explain to others what it's like. At least I have a
small inkling of what it must be for you - I feel for you and thank my lucky
stars mine went. Mine was [almost certainly] caused by a bout of
Otosclerosis (bone growing over the eardrum), or at least they had a common
cause, along with dizzy spells (think buildings apparently moving like cross
channel ferries) and conductive hearing loss. Usually progressive but mine
stopped for some reason. Chatting to people - fine. Sitting alone on top of
a mountain or lying in bed at night, the bloody noise emerges out of the
background to dominate. Insistently.


When I was around 6, we had an old (even for then!) 10" or 12"
television. When on it emitted a very high pitched tone. No-one else
seemed able to hear it.

And then I realised that, though it really did make a noise, some of it
was in my head. Had gradually become more insistent over the years. Good
old Radio 4 is about the only thing that I have found which really helps
- maybe as a mask.

I live with a partner who has some degree of ataxia sometimes - and low
frequency tinnitus. Not good.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

In message , Rod
writes

My 'normal' bilateral tinnitus is, I guess, somewhere in the 14+ KHz
range. Annoying I can't even hear that in real sound - though I can
hear a bit above 12 KHz. I have had it for around 43 years so am
somewhat used to it - not every hour of every day - it has become
progressively worse. It is now often the loudest thing around to me
unless television or radio is blaring. What puts me off from this being
the cause is a) I don't get the hum outside b) I don't get the hum
anywhere else. But I do carry the tinnitus everywhere.

Funnily enough, I do actually find it nice to read that someone's
tinnitus has disappeared. I am glad for you.

Does happen.

A friend kindly let off a 12 bore shotgun beside my left ear when we
were out rabbiting.

Tinnitus lasted about 8 months. My hearing is now down to about 12kHz
and I need a couple of extra notches on the volume control beyond what
is comfortable for my wife.

I also had a subsequent middle ear infection which the medical
profession were less than interested in.

regards


--
Tim Lamb

Franko wrote:
"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central heating.
Or the gas or electric meters. Or the router. Or the printer. Or the
ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in one
room than another. And maybe it is a little. But I hear it everywhere and
am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment the
environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days. (Funny,
you really notice it is there but not when it disappears so it is
difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft, birds,
rain, wind, cats, CFLs, hum from battery chargers, and on and on. This is
the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

I'll be keeping tabs on this thread - my hum is outside.
I've traipsed the streets at night and the hum always seems to be just
around the corner, once I get around the corner it seems to be coming from
the next corner and so on - I'll end up at Lands End eventually.
The Missus sometimes claims that she hears it but is well able to sleep
through it so I suffer alone mostly.
Franko.


50hz type sounds are notoriously difficult to locate with the ears.

It could be that there is substation humming away gently in the
neighborhood. I used to get a faint crackly hum off 11KV overheads
across the garden, as well as the pole mounted 'substation' feeding teh
house.

50hz is also not far off room resonances for some rooms. My small
bathroom with an extractor fan, drives me nuts: there is one place where
phase cancellation happens, but its JUST too far out of the bath level
to read a book in comfort. :-(

The Natural Philosopher wrote:
Franko wrote:
"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't
get back to sleep because of a noise. For some time now (at least
months) I have been noticing a strange noise. Searching around, one
the better descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to
get louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but
investigation, even switching them off, doesn't change the sound. Or
the central heating. Or the gas or electric meters. Or the router. Or
the printer. Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder
in one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component
to my tinnitus. But I cannot do so. It reduces immediately I go
outside and starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment
the environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days.
(Funny, you really notice it is there but not when it disappears so
it is difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to
have very similar sensitivity to sounds so I am constantly surprised
that she cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they go
on long enough. I hear washing machines, lawn mowers, cars, aircraft,
birds, rain, wind, cats, CFLs, hum from battery chargers, and on and
on. This is the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.

--
Rod

Hypothyroidism is a seriously debilitating condition with an
insidious onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

I'll be keeping tabs on this thread - my hum is outside.
I've traipsed the streets at night and the hum always seems to be just
around the corner, once I get around the corner it seems to be coming
from the next corner and so on - I'll end up at Lands End eventually.
The Missus sometimes claims that she hears it but is well able to
sleep through it so I suffer alone mostly.
Franko.

50hz type sounds are notoriously difficult to locate with the ears.

It could be that there is substation humming away gently in the
neighborhood. I used to get a faint crackly hum off 11KV overheads
across the garden, as well as the pole mounted 'substation' feeding teh
house.

50hz is also not far off room resonances for some rooms. My small
bathroom with an extractor fan, drives me nuts: there is one place where
phase cancellation happens, but its JUST too far out of the bath level
to read a book in comfort. :-(


I do keep feeling that there is a complex interference pattern involved
- the loudness seems to vary as I cross a room. We do have a small
substation thing quite close by - but I have gone there many times and
not noticed anything at all.

A few years ago the neighbour's water stopcock made a horrendous din
which came right into our house. But that was relavtively easy to identify.

My gut feeling is something to do with neighbours - meter, water pump,
anything!

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

"Rod" wrote in message
...


My gut feeling is something to do with neighbours - meter, water pump,
anything!

I've been pondering this while cutting back a blown-over, huge, eglantine.
If your house is connected to your neighbour's that's likely. Ask them to
kill their power supply for a short time.

Mary

In article , Franko
scribeth thus

"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't get
back to sleep because of a noise. For some time now (at least months) I
have been noticing a strange noise. Searching around, one the better
descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but investigation,
even switching them off, doesn't change the sound. Or the central heating.
Or the gas or electric meters. Or the router. Or the printer. Or the
ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder in one
room than another. And maybe it is a little. But I hear it everywhere and
am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment the
environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days. (Funny,
you really notice it is there but not when it disappears so it is
difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft, birds,
rain, wind, cats, CFLs, hum from battery chargers, and on and on. This is
the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

I'll be keeping tabs on this thread - my hum is outside.
I've traipsed the streets at night and the hum always seems to be just
around the corner, once I get around the corner it seems to be coming from
the next corner and so on - I'll end up at Lands End eventually.
The Missus sometimes claims that she hears it but is well able to sleep
through it so I suffer alone mostly.
Franko.



I remember reading about this in the press around 1970, so not a new
thing !...
--
Tony Sayer

In article , Tim Lamb
scribeth thus
In message , Rod
writes

My 'normal' bilateral tinnitus is, I guess, somewhere in the 14+ KHz
range. Annoying I can't even hear that in real sound - though I can
hear a bit above 12 KHz. I have had it for around 43 years so am
somewhat used to it - not every hour of every day - it has become
progressively worse. It is now often the loudest thing around to me
unless television or radio is blaring. What puts me off from this being
the cause is a) I don't get the hum outside b) I don't get the hum
anywhere else. But I do carry the tinnitus everywhere.

Funnily enough, I do actually find it nice to read that someone's
tinnitus has disappeared. I am glad for you.

Does happen.

A friend kindly let off a 12 bore shotgun beside my left ear when we
were out rabbiting.

I trust you wrapped it around his right ear;!....

Tinnitus lasted about 8 months. My hearing is now down to about 12kHz
and I need a couple of extra notches on the volume control beyond what
is comfortable for my wife.

I also had a subsequent middle ear infection which the medical
profession were less than interested in.

regards



--
Tony Sayer

When I was around 6, we had an old (even for then!) 10" or 12" television.
When on it emitted a very high pitched tone. No-one else seemed able to
hear it.

Yes, that's normal, even today.
Most CRT TVs scream fairly loudly at just over 15KHz.

That's the line frequency for 625 line 25 field/sec TV.
( Unless the TV is doing some fancy double-scanning at 100Hz, perhaps )
The Line Output Transformer usually rattles away at that frequency.

Lots of other people can hear it.
When I was younger, I could hear a TV singing from a long way off; like in
another room.
I can still hear it in the same room.
I don't know why others claim not to hear it. Perhaps they actually can't,
or perhaps they just are so accustomed to it they don't recognise it for
what it is.

You can use it as a diagnostic test on dead TVs ( if your hearing's up to
it. ) No whistle: Line Timebase is down and no EHT. Whistle: Line
timebase is up, and EHT likely present. 'Crackle' sound and static on tube
face confirms. Also neon within a few inches of tube anode glows. Mind
where you poke your fingers.

--
Ron

Just as matter of interest mains transformers hum at 100Hz.

Its the plates that move in and out every half cycle.

On 29 May, 16:07, "Ron Lowe" ronATlowe-famlyDOTmeDOTukSPURIOUS
wrote:
When I was around 6, we had an old (even for then!) 10" or 12" television.
When on it emitted a very high pitched tone. No-one else seemed able to
hear it.

Yes, that's normal, even today.
Most CRT TVs scream fairly loudly at just over 15KHz.

That's the line frequency for 625 line 25 field/sec TV.
( Unless the TV is doing some fancy double-scanning at 100Hz, perhaps )
The Line Output Transformer usually rattles away at that frequency.

Lots of other people can hear it.
When I was younger, I could hear a TV singing from a long way off; like in
another room.
I can still hear it in the same room.

Me too. When I was considerably younger, I actively avoided certain
TVs because their 15kHz was too loud!

As for the Hum, Wikipedia has an overview of this. Taken with the
usual scepticism about the veracity of Wikipedia article, on the face
of it, it appears to be relatively good.

URL:http://en.wikipedia.org/wiki/The_Hum

Cheers,

Sid

Rod wrote:
The Natural Philosopher wrote:
Franko wrote:
"Rod" wrote in message
...
What is polygonum doing posting at this silly time? Well - I can't
get back to sleep because of a noise. For some time now (at least
months) I have been noticing a strange noise. Searching around, one
the better descriptions appears on Wiki:

http://en.wikipedia.org/wiki/The_Hum

For a moment, I think it is a distant aircraft - which I expect to
get louder and then fade away - but it just continues.

For a while I think it is the fridge or the freezer - but
investigation, even switching them off, doesn't change the sound. Or
the central heating. Or the gas or electric meters. Or the router.
Or the printer. Or the ioniser. Or the clock on the oven.

For even longer I traipse round the house expecting it to be louder
in one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass
component to my tinnitus. But I cannot do so. It reduces immediately
I go outside and starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the
moment the environment is quiet again it returns.

Sometimes I can go without hearing the hum for hours - maybe days.
(Funny, you really notice it is there but not when it disappears so
it is difficult to keep track of.)

Oh - and partner never hears the hum. In every other way we seem to
have very similar sensitivity to sounds so I am constantly surprised
that she cannot hear it at all. Ever.

Every other sound I hear I feel I can interpret - at least if they
go on long enough. I hear washing machines, lawn mowers, cars,
aircraft, birds, rain, wind, cats, CFLs, hum from battery chargers,
and on and on. This is the only thing that completely defeats me.

Any ideas?

A tired, sleepy polygonum.

--
Rod

Hypothyroidism is a seriously debilitating condition with an
insidious onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

I'll be keeping tabs on this thread - my hum is outside.
I've traipsed the streets at night and the hum always seems to be
just around the corner, once I get around the corner it seems to be
coming from the next corner and so on - I'll end up at Lands End
eventually.
The Missus sometimes claims that she hears it but is well able to
sleep through it so I suffer alone mostly.
Franko.

50hz type sounds are notoriously difficult to locate with the ears.

It could be that there is substation humming away gently in the
neighborhood. I used to get a faint crackly hum off 11KV overheads
across the garden, as well as the pole mounted 'substation' feeding
teh house.

50hz is also not far off room resonances for some rooms. My small
bathroom with an extractor fan, drives me nuts: there is one place
where phase cancellation happens, but its JUST too far out of the bath
level to read a book in comfort. :-(


I do keep feeling that there is a complex interference pattern involved
- the loudness seems to vary as I cross a room. We do have a small
substation thing quite close by - but I have gone there many times and
not noticed anything at all.

Thats may well be the case..it may be that your room is effectvely a
50hz resonator and is picking it up through maybe ground vibrations.



A few years ago the neighbour's water stopcock made a horrendous din
which came right into our house. But that was relavtively easy to identify.

My gut feeling is something to do with neighbours - meter, water pump,
anything!

"Rod" wrote in message
...
RW wrote:
http://en.wikipedia.org/wiki/The_Hum
For a moment, I think it is a distant aircraft - which I expect to get
louder and then fade away - but it just continues.
snip

It's the blood inside yer head................

Lobotomy would cure it.

And in the spirit of uk.d-i-y I would wish to follow the great Phnieas
Gauge [1] in doing my own. But homemade explosives are somewhat frowned on
in the UK these days. Especially in High Wycombe. So I guess is it is the
Bosch [2] with a hole cutter to get started...

[1] http://en.wikipedia.org/wiki/Phineas_Gage
[2] http://news.bbc.co.uk/1/hi/health/7308077.stm

Angle Grinder

Rod wrote:

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment
the environment is quiet again it returns.

Had a similar experience once - a hum that seemed very quiet but
pervasive inside the house but could not be traced. In the end I worked
out what it was - the next door neighbours fish tank. He had tucked a
pump unit down behind it and it was vibrating against a wall. Once we
sat it on a bit of foam rubber the noise went away!


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Thu, 29 May 2008 21:00:12 +0100, John Rumm
wrote:

Rod wrote:

For even longer I traipse round the house expecting it to be louder in
one room than another. And maybe it is a little. But I hear it
everywhere and am never sure whether variations are me or it.

For a bit longer I try to convince myself that it is a bass component to
my tinnitus. But I cannot do so. It reduces immediately I go outside and
starts up again the moment I come back inside.

Any foreground sounds are enough to knock the hum out. But the moment
the environment is quiet again it returns.

Had a similar experience once - a hum that seemed very quiet but
pervasive inside the house but could not be traced. In the end I worked
out what it was - the next door neighbours fish tank. He had tucked a
pump unit down behind it and it was vibrating against a wall. Once we
sat it on a bit of foam rubber the noise went away!

We have the newspaper plant not far away and I can hear that
sometimes. We didn't used to but someone cut a lot of trees down.
--
http://www.orderonlinepickupinstore.co.uk
Ah fetch it yourself if you can't wait for delivery
http://www.freedeliveryuk.co.uk
http://www.holidayunder100.co.uk

"Ron Lowe" ronATlowe-famlyDOTmeDOTukSPURIOUS wrote in message
...

When I was around 6, we had an old (even for then!) 10" or 12"
television. When on it emitted a very high pitched tone. No-one else
seemed able to hear it.

Yes, that's normal, even today.
Most CRT TVs scream fairly loudly at just over 15KHz.

That's the line frequency for 625 line 25 field/sec TV.
( Unless the TV is doing some fancy double-scanning at 100Hz, perhaps )
The Line Output Transformer usually rattles away at that frequency.

Lots of other people can hear it.
When I was younger, I could hear a TV singing from a long way off; like in
another room.
I can still hear it in the same room.
I don't know why others claim not to hear it. Perhaps they actually
can't, or perhaps they just are so accustomed to it they don't recognise
it for what it is.

You can use it as a diagnostic test on dead TVs ( if your hearing's up to
it. ) No whistle: Line Timebase is down and no EHT. Whistle: Line
timebase is up, and EHT likely present. 'Crackle' sound and static on tube
face confirms. Also neon within a few inches of tube anode glows. Mind
where you poke your fingers.

--
Ron


When the line is locked, the LOPTx positively *sings* rather than just
whistling. Little smartarse that I was back when I was a kid, I told the
instructor on a company training course, that I could adjust a line hold
control to be smack in the middle of the flywheel sync 'window', just by
listening to the line whistle. He insisted that this just wasn't possible,
so I had to show him, didn't I ... ? Nearly 40 years later, I can still hear
line whistle ok, but I'm not sure I could still repeat the adjustment trick.

Arfa

On May 29, 4:46 pm, Rod wrote:

Oh – and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Trust your hearing, there will be a cause for the noise. Those who
cannot hear it are simply deaf.

Every other sound I hear I feel I can interpret – at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft,
birds, rain, wind, cats, CFLs, hum from battery chargers, and on and on.
This is the only thing that completely defeats me.

Any ideas?

http://www.amasci.com/hum/tinn2.txt

Note carefully: "sufferers from "The Hum" are able to find certain
places in which they do not experience the noise any time. This is
very different from the experience of anyone with tinnitus in which
the noises are with them wherever they may be."

So discard any suggestion that you have tinnitus or any hearing
problem.

I have managed to record an annoying hum with an ordinary digital
camera that makes videos. You can use the lowest video quality. Wait
until there are no other background noises.
Then feed the sound into an amplifier or play it on your computer.
You and everyone else will now hear the sound.
I was able to prove that my sound was a large diesel generator on a
ship about 2km away. I could go next to the ship and record the same
sound. Since ships come and go every day, the sound changes a lot!

Matty F wrote:
On May 29, 4:46 pm, Rod wrote:

Oh – and partner never hears the hum. In every other way we seem to have
very similar sensitivity to sounds so I am constantly surprised that she
cannot hear it at all. Ever.

Trust your hearing, there will be a cause for the noise. Those who
cannot hear it are simply deaf.

Every other sound I hear I feel I can interpret – at least if they go on
long enough. I hear washing machines, lawn mowers, cars, aircraft,
birds, rain, wind, cats, CFLs, hum from battery chargers, and on and on.
This is the only thing that completely defeats me.

Any ideas?

http://www.amasci.com/hum/tinn2.txt

Note carefully: "sufferers from "The Hum" are able to find certain
places in which they do not experience the noise any time. This is
very different from the experience of anyone with tinnitus in which
the noises are with them wherever they may be."

So discard any suggestion that you have tinnitus or any hearing
problem.

I have managed to record an annoying hum with an ordinary digital
camera that makes videos. You can use the lowest video quality. Wait
until there are no other background noises.
Then feed the sound into an amplifier or play it on your computer.
You and everyone else will now hear the sound.
I was able to prove that my sound was a large diesel generator on a
ship about 2km away. I could go next to the ship and record the same
sound. Since ships come and go every day, the sound changes a lot!

Wonderful! I am located pretty much as far from the sea as it is
possible to get. :-(

I shall try the camera next time I am awake with the hum. Too much other
noise during the day.

Thanks also for the link. (Partner pointed out that is Norfolk and good!
:-) )

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

Rod wrote:

I shall try the camera next time I am awake with the hum. Too much other
noise during the day.

I found that the camera could record the sound outside just fine, but
not inside the house, even though I could hear the noise inside. You
may find it best to turn off the autofocussing, as that will make a
constant clicking noise as it tries to find something to focus on in
the dark.

On May 30, 8:15 pm, Rod wrote:
Matty F wrote:

I have managed to record an annoying hum with an ordinary digital
camera that makes videos. You can use the lowest video quality. Wait
until there are no other background noises.
Then feed the sound into an amplifier or play it on your computer.
You and everyone else will now hear the sound.
I was able to prove that my sound was a large diesel generator on a
ship about 2km away.

Here is the diesel generator noise that I recorded. It's only 300K.

http://tinypic.com/player.php?v=lk39v&s=3

They now face the ships the other way around so that the exhaust
points away from me. I can hardly hear it any more!

The "noise" that is on Wikipedia is not a real hum noise, it's just
generated by a university lecturer who admits that he can't hear the
real noise.

On Thu, 29 May 2008 22:22:30 +0100, Mogga
wrote:

We have the newspaper plant not far away and I can hear that
sometimes. We didn't used to but someone cut a lot of trees down.
Suspicious...

Geo

Ron Lowe wrote:

When I was around 6, we had an old (even for then!) 10" or 12"
television. When on it emitted a very high pitched tone. No-one else
seemed able to hear it.

Yes, that's normal, even today.
Most CRT TVs scream fairly loudly at just over 15KHz.

That's the line frequency for 625 line 25 field/sec TV.
( Unless the TV is doing some fancy double-scanning at 100Hz, perhaps )
The Line Output Transformer usually rattles away at that frequency.


Just realised (having read past this acceptingly first time). Not quite
right for me. Not 625 - good ol' 405.

--
Rod

Hypothyroidism is a seriously debilitating condition with an insidious
onset.
Although common it frequently goes undiagnosed.
www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org

wrote in message ...
On 30 May,
"Arfa Daily" wrote:


When the line is locked, the LOPTx positively *sings* rather than just
whistling. Little smartarse that I was back when I was a kid, I told the
instructor on a company training course, that I could adjust a line hold
control to be smack in the middle of the flywheel sync 'window', just by
listening to the line whistle. He insisted that this just wasn't
possible,
so I had to show him, didn't I ... ?

I could similarly tell.

Nearly 40 years later, I can still hear line whistle ok, but I'm not sure
I
could still repeat the adjustment trick.

I doubt if (I'm sure I can't) hear the line whistle anymore, my ears cut
off
at well below 10.125, nevermind 15.625 kHz.

I had a hugh notch in my hearing at 10.125, but it disappeared within a
year
or so of 405 TV stopping.

--
B Thumbs
Change lycos to yahoo to reply

That's interesting. I guess it's like a sort of 'software notch' in the
brain. Like a very narrow version of the 'broadband' notch that my wife can
apply at will, against intrusive shop music, and kids squealing in
supermarkets. I never could do that ... When 405 was still around, the line
whistle was deafening to me, probably because I knew what I was listening
for. You could walk down a street, and hear it as you went past the front
window of every house !

Arfa