Anyone care to venture a guess what's inside this?
http://www.survival-systems.com/yeticom/cp-1.html

On 4 Jan 2007 10:39:31 -0800, "Telstar Electronics"
wrote:

Anyone care to venture a guess what's inside this?
http://www.survival-systems.com/yeticom/cp-1.html


Someone has to briefly describe to me, the difference between Speech Compression
and Speech Proccessor. My Turner +3 mic has compression, which allows a steady
volume regardless of distance. I think my Icom 746 also has compression. But can
anyone be more specific?

Vinnie S.

On Thu, 04 Jan 2007 16:53:09 -0500, Vinnie S.
wrote:

+++On 4 Jan 2007 10:39:31 -0800, "Telstar Electronics"
+++wrote:
+++
+++Anyone care to venture a guess what's inside this?
+++http://www.survival-systems.com/yeticom/cp-1.html
+++
+++
+++Someone has to briefly describe to me, the difference between Speech Compression
+++and Speech Proccessor. My Turner +3 mic has compression, which allows a steady
+++volume regardless of distance. I think my Icom 746 also has compression. But can
+++anyone be more specific?
+++
+++Vinnie S.
*********

Compression is essentially where the output signal is limited by
controlling the gain of a stage. This is accomplished by some means of
feedback of the output to the input to reduce gain as the input signal
becomes larger. The amount of compression is the amount of feedback to
reduce gain. One can go to a point to where the stage becomes an
attenuator by sufficient feedback. With opamps this can be a very
serious problem as they do not work well below unity gain.

Speech processing is a broad term that includes compression, clipping
and even DSP.

james

On Thu, 04 Jan 2007 22:40:02 GMT, james wrote:

On Thu, 04 Jan 2007 16:53:09 -0500, Vinnie S.

Compression is essentially where the output signal is limited by
controlling the gain of a stage. This is accomplished by some means of
feedback of the output to the input to reduce gain as the input signal
becomes larger. The amount of compression is the amount of feedback to
reduce gain. One can go to a point to where the stage becomes an
attenuator by sufficient feedback. With opamps this can be a very
serious problem as they do not work well below unity gain.

Speech processing is a broad term that includes compression, clipping
and even DSP.

james

Thanks !

Vinnie S.

On Thu, 04 Jan 2007 16:53:09 -0500, Vinnie S.
wrote in :

On 4 Jan 2007 10:39:31 -0800, "Telstar Electronics"
wrote:

Anyone care to venture a guess what's inside this?
http://www.survival-systems.com/yeticom/cp-1.html


Someone has to briefly describe to me, the difference between Speech Compression
and Speech Proccessor. My Turner +3 mic has compression, which allows a steady
volume regardless of distance. I think my Icom 746 also has compression. But can
anyone be more specific?

Vinnie S.


A "processor" is a device that does something with the signal. This
can any combination of compression, expansion, limiting, distortion,
effects, automatic gain control (AGC), etc, etc.

The term "compression" is used to describe a type of signal processing
where the dynamic range of a signal is reduced without losing it's
content.

One type of compression is "limiting" which either clips or modifies
the dynamic peaks of a signal. Clipping is simply the 'chopping off'
of signal peaks. Limiting can also be done by automatic reduction of
gain as it peaks (a type of automatic gain control). Limiters are used
in radio because dynamic peaks in the audio can cause modulation to
exceed 100% resulting in splatter and distortion. If those peaks are
limited, the average level of the audio signal, and therefore the
"talk-power", can be increased.

Another type of compressor is called a "Constant Volume Amplifier"
(CVA), which uses AGC to keep the level of the signal at a relatively
constant level. (This is different than a limiter because a CVA works
by changing the gain throughout the dynamic range, while a limiter
only reduces the gain at dynamic peaks.) The CVA is used in sound
studios to compensate for changes in the volume of a person's voice
into a microphone. (If you watch reruns of Hee-Haw you can see the
old-timers will adjust their distance to the mic while they sing; they
learned to do this because they often played without the benefit of a
CVA in the sound system.)

Compared to a limiter, the response of a CVA is slow, and cannot be
used to increase the average audio level (talk-power) because it does
not reduce or eliminate the peaks that drive modulation over 100%.

Brian built a CVA.

Frank Gilliland wrote:
One type of compression is "limiting" which either clips or modifies
the dynamic peaks of a signal. Clipping is simply the 'chopping off'
of signal peaks. Limiting can also be done by automatic reduction of
gain as it peaks (a type of automatic gain control). Limiters are used
in radio because dynamic peaks in the audio can cause modulation to
exceed 100% resulting in splatter and distortion. If those peaks are
limited, the average level of the audio signal, and therefore the
"talk-power", can be increased.

Another type of compressor is called a "Constant Volume Amplifier"
(CVA), which uses AGC to keep the level of the signal at a relatively
constant level. (This is different than a limiter because a CVA works
by changing the gain throughout the dynamic range, while a limiter
only reduces the gain at dynamic peaks.) The CVA is used in sound
studios to compensate for changes in the volume of a person's voice
into a microphone. (If you watch reruns of Hee-Haw you can see the
old-timers will adjust their distance to the mic while they sing; they
learned to do this because they often played without the benefit of a
CVA in the sound system.)

Compared to a limiter, the response of a CVA is slow, and cannot be
used to increase the average audio level (talk-power) because it does
not reduce or eliminate the peaks that drive modulation over 100%.

Brian built a CVA.

Well... Frank is almost right... the processor that I'm prototyping has
an VCA (CVA as Frank puts it) amplifier, amplitude limiting, and a
noise gate to cut off unwanted background sound. I suggest you go here
to read for yourself.
http://www.analog.com/UploadedFiles/...ts/SSM2166.pdf

www.telstar-electronics.com

Telstar Electronics wrote:
Anyone care to venture a guess what's inside this?
http://www.survival-systems.com/yeticom/cp-1.html

So can I assume nobody knows what's inside here?

www.telstar-electrnoics.com

On 5 Jan 2007 04:49:24 -0800, "Telstar Electronics"
wrote in
. com:


Frank Gilliland wrote:
One type of compression is "limiting" which either clips or modifies
the dynamic peaks of a signal. Clipping is simply the 'chopping off'
of signal peaks. Limiting can also be done by automatic reduction of
gain as it peaks (a type of automatic gain control). Limiters are used
in radio because dynamic peaks in the audio can cause modulation to
exceed 100% resulting in splatter and distortion. If those peaks are
limited, the average level of the audio signal, and therefore the
"talk-power", can be increased.

Another type of compressor is called a "Constant Volume Amplifier"
(CVA), which uses AGC to keep the level of the signal at a relatively
constant level. (This is different than a limiter because a CVA works
by changing the gain throughout the dynamic range, while a limiter
only reduces the gain at dynamic peaks.) The CVA is used in sound
studios to compensate for changes in the volume of a person's voice
into a microphone. (If you watch reruns of Hee-Haw you can see the
old-timers will adjust their distance to the mic while they sing; they
learned to do this because they often played without the benefit of a
CVA in the sound system.)

Compared to a limiter, the response of a CVA is slow, and cannot be
used to increase the average audio level (talk-power) because it does
not reduce or eliminate the peaks that drive modulation over 100%.

Brian built a CVA.

Well... Frank is almost right... the processor that I'm prototyping has
an VCA (CVA as Frank puts it) amplifier,


VCA -- Voltage Controlled Amplifier
CVA -- Constant Volume Amplifier

Maybe your confusion lies in the fact that a CVA requires a VCA as a
component of the AGC loop.... or maybe there's just too many anagrams
for your brain to process.


amplitude limiting,


Every amplifier has a limit.


and a
noise gate to cut off unwanted background sound.


Hmmm..... now -that's- useful for a CB radio.


I suggest you go here
to read for yourself.
http://www.analog.com/UploadedFiles/...ts/SSM2166.pdf


And I suggested you go get an education, but so far you have just been
demonstrating your need to do so.

So where's the schematic for your amplifier, Brian?

I noticed that also, you got allot of theories, and all about audio
compressors, limiters, but NOT a dam thing on the posted subject, WHAT'S ON
the inside of the little module was the only thing asked.


"Telstar Electronics" wrote in message
ps.com...
Telstar Electronics wrote:
Anyone care to venture a guess what's inside this?
http://www.survival-systems.com/yeticom/cp-1.html

So can I assume nobody knows what's inside here?

www.telstar-electrnoics.com

JSF wrote:
I noticed that also, you got allot of theories, and all about audio
compressors, limiters, but NOT a dam thing on the posted subject, WHAT'S ON
the inside of the little module was the only thing asked.

Thanks JSF... Frank has a tendancy to wander off topic... LOL
You're absolutely right, nobody has even taken a guess at what's inside
that module.

www.telstar-electronics.com