On 14/03/2017 10:50, Dave Plowman (News) wrote:
In article ,
John Rumm wrote:
On 13/03/2017 15:01, Dave Plowman (News) wrote:
In article ,
John Rumm wrote:
2) Totally blank the screen (and audio) so there is no indication it is on.

The screen and audio would not need to be on in the first place. Its
not on in standby is it?

How many separately switched power rails do you think are in the
average TV - all controlled via the software?

Judging by what is in a typical laptop - a few dozen.

So just what can be switched off on a laptop that wouldn't be needed under
normal use?

Laptops (like most PCs) have a number of discrete power states:

https://msdn.microsoft.com/en-gb/lib...(v=vs.85).aspx

However the control is *far* more fine grained than that. The power
management controller will typically control a multitude of individual
rails - combinations of which will need to be switched for any given
power state (laptops are much more complex than desktops in this respect
since they also have to allow multiple power sources as well as deal
with charging). Quite often there is a logic chain that will detect and
prove one bit of circuitry before powering the next. That allows for
more comprehensive fault reporting.

Generally when making things by the million you don't put in
facilities that will never be needed.

True, but you can get off the shelf power management controllers that do
much of the grunt work for you. It may cost you a bit more at board
layout time, but not a large change to the BoM once into production.

Why would you provide the ability to
turn off picture and sound etc but power up the rest if this was never
needed in practice?

Its already used in practice... as I mentioned before timed recording,
OTT updates etc.

Have you actually known any set do a software update without switching on?

Yup. Mine certainly does timed recordings without turning the screen or
audio on.

But surely for this system to be of much use, it's going to have to work
with any TV with a built in mic?

Custom software would need to be written at least for each individual
platform, and possibly even tuned for individual sets.

The 2014 hack that was described in the leak, was for a particular range
or possibly even model of set from 2013.

--
Cheers,

John.

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