What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

It occurs to me that there might be a PLL in there somewhere, but I've got
blank sheet of paper syndrome.

TIA.

On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

It occurs to me that there might be a PLL in there somewhere, but I've got
blank sheet of paper syndrome.

TIA.


Tape loop ?:-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Obama says, "I AM NOT a cry baby, Fox REALLY IS out to get me!"

Jim Thompson wrote:

On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

It occurs to me that there might be a PLL in there somewhere, but I've got
blank sheet of paper syndrome.

TIA.


Tape loop ?:-)


A well trained mocking bird? ;-)


--
The movie 'Deliverance' isn't a documentary!

"ian field" wrote in message
...
What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

It occurs to me that there might be a PLL in there somewhere, but I've got
blank sheet of paper syndrome.

TIA.


The Boss DF-2 pedal does something like that. See
http://www.schematicx.com/view-schem...dal-schematic/
for example.

Chris

On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?


JF

On Wed, 04 Nov 2009 10:34:20 -0600, John Fields
wrote:

On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?


JF

Wasn't there at one time something called a "bucket brigade" that
could take snap-shot recordings?

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Calling an illegal alien an "undocumented immigrant" is like
Calling a drug dealer an "unlicensed pharmacist"

Jim Thompson wrote:

On Wed, 04 Nov 2009 10:34:20 -0600, John Fields
wrote:

On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?


JF

Wasn't there at one time something called a "bucket brigade" that
could take snap-shot recordings?


Digikey was still selling the Panasonic 'Bucket Brigade Analog Delay
Lines' a few years ago.


--
The movie 'Deliverance' isn't a documentary!

On Wed, 04 Nov 2009 13:58:37 -0500, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

On Wed, 04 Nov 2009 10:34:20 -0600, John Fields
wrote:

On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?


JF

Wasn't there at one time something called a "bucket brigade" that
could take snap-shot recordings?


Digikey was still selling the Panasonic 'Bucket Brigade Analog Delay
Lines' a few years ago.

Of course, the best response to the OP is, "WHY?"

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

Obama says, "I AM NOT a cry baby, Fox REALLY IS out to get me!"

On Wed, 04 Nov 2009 12:39:06 -0700, Jim Thompson
wrote:

On Wed, 04 Nov 2009 13:58:37 -0500, "Michael A. Terrell"
wrote:


Jim Thompson wrote:

On Wed, 04 Nov 2009 10:34:20 -0600, John Fields
wrote:

On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?


JF

Wasn't there at one time something called a "bucket brigade" that
could take snap-shot recordings?


Digikey was still selling the Panasonic 'Bucket Brigade Analog Delay
Lines' a few years ago.

Of course, the best response to the OP is, "WHY?"

---
I don't much care about why, since the fun for me is doing the design.
:-)

Seems what the OP wants to do is monitor a sine wave source and then
when the source's tone gets to some "threshold", have the device
monitoring the source generate that tone forever.

But, who knows for sure, since his "specs" were pretty sketchy?

JF

"John Fields" wrote in message
...
On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?

Sample a frequency - the analogy with "sample and hold" is once the
frequency is recognised, something like a VCO continues to reproduce the
frequency until a reset.

Threshold is when a tone exceeds a set amplitude it triggers the sample
action, so as to prevent background sounds confusing the circuit.

On Wed, 4 Nov 2009 22:09:04 -0000, "ian field"
wrote:


"John Fields" wrote in message
.. .
On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?

Sample a frequency - the analogy with "sample and hold" is once the
frequency is recognised, something like a VCO continues to reproduce the
frequency until a reset.

Threshold is when a tone exceeds a set amplitude it triggers the sample
action, so as to prevent background sounds confusing the circuit.

---
OK, that's doable.

Next, do you need the copy to be a sine wave, like the original, or can
it be a square wave

Also, what kind of frequency/phase accuracy are you looking for with
regard to the difference between the source and the copy?

What else can you tell us? Voltages, power, etc, etc.

You know, the details the devil's in.


JF

"John Fields" wrote in message
...
On Wed, 4 Nov 2009 22:09:04 -0000, "ian field"
wrote:


"John Fields" wrote in message
. ..
On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain
sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a
pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?

Sample a frequency - the analogy with "sample and hold" is once the
frequency is recognised, something like a VCO continues to reproduce the
frequency until a reset.

Threshold is when a tone exceeds a set amplitude it triggers the sample
action, so as to prevent background sounds confusing the circuit.

---
OK, that's doable.

Next, do you need the copy to be a sine wave, like the original, or can
it be a square wave

Also, what kind of frequency/phase accuracy are you looking for with
regard to the difference between the source and the copy?

What else can you tell us? Voltages, power, etc, etc.

You know, the details the devil's in.

Its for feeding a digital frequency counter, so it can be converted to a
square wave at any point in the process.

The objective is for a frequency range equal to all the keys on a piano, it
needs to be fairly accurate.

On Thu, 5 Nov 2009 16:20:21 -0000, "ian field"
wrote:


"John Fields" wrote in message
.. .
On Wed, 4 Nov 2009 22:09:04 -0000, "ian field"
wrote:


"John Fields" wrote in message
...
On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain
sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a
pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?

Sample a frequency - the analogy with "sample and hold" is once the
frequency is recognised, something like a VCO continues to reproduce the
frequency until a reset.

Threshold is when a tone exceeds a set amplitude it triggers the sample
action, so as to prevent background sounds confusing the circuit.

---
OK, that's doable.

Next, do you need the copy to be a sine wave, like the original, or can
it be a square wave

Also, what kind of frequency/phase accuracy are you looking for with
regard to the difference between the source and the copy?

What else can you tell us? Voltages, power, etc, etc.

You know, the details the devil's in.

Its for feeding a digital frequency counter, so it can be converted to a
square wave at any point in the process.

The objective is for a frequency range equal to all the keys on a piano, it
needs to be fairly accurate.

---
There may be a much simpler way to solve whatever problem you need the
gadget for.

What's your application?

JF

On Wed, 4 Nov 2009 22:09:04 -0000, "ian field"
wrote:


"John Fields" wrote in message
.. .
On Wed, 4 Nov 2009 13:17:24 -0000, "ian field"
wrote:

What would be the minimalist circuit blocks for a frequency domain sample
and hold?

What I envisage is the sampling triggered by a tone that exceeds a pre-set
threshold and continues to generate a copy of the tone until reset.

---
I'm confused...

What do you mean by 'sampling' and what do you mean by 'threshold'?

Sample a frequency - the analogy with "sample and hold" is once the
frequency is recognised, something like a VCO continues to reproduce the
frequency until a reset.

Threshold is when a tone exceeds a set amplitude it triggers the sample
action, so as to prevent background sounds confusing the circuit.

---
OK, that's doable.

Next, do you need the copy to be a sine wave, like the original, or can
it be a square wave

Also, what kind of frequency/phase accuracy are you looking for with
regard to the difference between the source and the copy?

What else can you tell us? Voltages, power, etc, etc.

You know, the details the devil's in.


JF