I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph 5 saying - that my *analogue* tuner is carrying out A/D and
D/A conversions..??

"Keith G"

I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is paragraph
5 saying - that my *analogue* tuner is carrying out A/D and D/A
conversions..??


** A " sample and hold " is an ANALOGUE circuit.

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


The blurb in that para is all gobbledegook.




........ Phil

Keith G wrote:

I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph 5 saying - that my *analogue* tuner is carrying out A/D and
D/A conversions..??

Sampling doesn't imply any form of 'digital' operation.

Graham

On Thu, 23 Aug 2007 03:05:30 +0100, "Keith G"
wrote:


I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph 5 saying - that my *analogue* tuner is carrying out A/D and
D/A conversions..??



No. It is making the audio output the same way a class D amplifier
does. It generates pulses of constant width and measures their average
level. When the frequency is higher, they are closer together and the
average level goes up. When the frequency is lower they are further
apart and the level goes down. That gives you your audio from the
frequency modulation.

d

--
Pearce Consulting
http://www.pearce.uk.com

On Thu, 23 Aug 2007 12:17:26 +1000, "Phil Allison"
wrote:


"Keith G"

I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is paragraph
5 saying - that my *analogue* tuner is carrying out A/D and D/A
conversions..??


** A " sample and hold " is an ANALOGUE circuit.

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


The blurb in that para is all gobbledegook.


Why are you talking about sample and hold? It uses a monostable with a
duration roughly half the repetition rate.

d

--
Pearce Consulting
http://www.pearce.uk.com

In article ,
Keith G wrote:

I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph 5 saying - that my *analogue* tuner is carrying out A/D and
D/A conversions..??

Love 'the new approach to mode switching' - car radios have used blending
from stereo to mono for about 30 years...

--
*If you try to fail and succeed, which have you done? *

Dave Plowman London SW
To e-mail, change noise into sound.

In article , Keith G
scribeth thus

I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph 5 saying - that my *analogue* tuner is carrying out A/D and
D/A conversions..??




Its digital Keith .. but not as we know it...
--
Tony Sayer

"Don Pearce"
"Phil Allison"
"Keith G"

I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph
5 saying - that my *analogue* tuner is carrying out A/D and D/A
conversions..??


** A " sample and hold " is an ANALOGUE circuit.

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


The blurb in that para is all gobbledegook.


Why are you talking about sample and hold?


** Cos the blurb uses that term - ****wit.


It uses a monostable with a
duration roughly half the repetition rate.



** What mind destroying drugs are you one now

- YOU ****ING POMMY IMBECILE.




......... Phil

"Don Pearce" wrote in message
...
On Thu, 23 Aug 2007 03:05:30 +0100, "Keith G"
wrote:


I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph 5 saying - that my *analogue* tuner is carrying out A/D and
D/A conversions..??



No. It is making the audio output the same way a class D amplifier
does. It generates pulses of constant width and measures their average
level. When the frequency is higher, they are closer together and the
average level goes up. When the frequency is lower they are further
apart and the level goes down. That gives you your audio from the
frequency modulation.


OK, like in the diagram:

http://www.apah69.dsl.pipex.com/show/Brochure01.JPG

Which I see as:

1) Wiggly line
2) Chunks
3) More chunks
4) Even more chunks
5) Wiggly line again...

You know what my next question would be, don't you? :-)

(The words 'modem', 'analogue signal' and 'why bother' would figure in
it, I suspect...)

"Dave Plowman (News)" wrote in message
...
In article ,
Keith G wrote:

I don't mind admitting that most of the information on this page:

http://www.apah69.dsl.pipex.com/show/Tuner.JPG

flies right over my head, but it's all very interesting! What is
paragraph 5 saying - that my *analogue* tuner is carrying out A/D and
D/A conversions..??

Love 'the new approach to mode switching' - car radios have used
blending
from stereo to mono for about 30 years...


And a piccy from the brochure for you:

http://www.apah69.dsl.pipex.com/show/Brochure02.JPG