On Sep 14, 6:42 am, Deek wrote:
I understand DISTORTION quite well! I hold an EE degree, managed an EE design
department for 10 years, and served as Chief Engineer on a major Military System
LGM 118A RS/RV.
Speech compression IS IS IS distortion. PERIOD!

I can see why your services were no longer required as Chief
Engineer... thanks for your comments.
www.telstar-electronics.com

Telstar Electronics wrote:
On Sep 14, 6:42 am, Deek wrote:

I understand DISTORTION quite well! I hold an EE degree, managed an EE design
department for 10 years, and served as Chief Engineer on a major Military System
LGM 118A RS/RV.
Speech compression IS IS IS distortion. PERIOD!


I can see why your services were no longer required as Chief
Engineer... thanks for your comments.
www.telstar-electronics.com


I can see why you're more interested in $$ than in accuracy.

If I put a CONSTANT amplitude swept frequency signal, swept from 300 to 3000 Hz,
audio bandwidth, to the input to a transmitting device and I get a VARIABLE
amplitude signal, swept from 300 to 3000 Hz, as the audio output, the device has
DISTORTED the audio.

That's just what speech compressors accomplish.

Every single speech processor is a controlled distortion device. You can market
and do salesmanship all you want. You are still selling a device that distorts
the audio.

Distortion is distortion!!

"Deek" wrote in message
. ..
Telstar Electronics wrote:

On Sep 13, 3:19 pm, Deek wrote:

Telstar Electronics wrote:

Why Do You Need a Speech Processor for Your CB Radio?
Two-way radio communication relies on the modulation contained within
the signal. Maintaining a high modulation level is crucial in
providing the highest possible efficiency from any transmitter
operating on AM, FM, or SSB modes. Two-way radios also rely on
microphones that inherently change audio levels delivered to the
transmitter. This causes transmitter modulation to fluctuate greatly
depending on voice level and pitch. The average modulation of a
typical voice signal is only about 40%. This low percentage applied
to the transmitter, results in less than optimal transmission range.

PURE B--- S---

The peak power is the peak power is the peak power!

Distorting the audio with a speech processor ... distorts the audio.

Distorted audio is distorted audio is distorted audio.

Modulation is supposed to fluctuate greatly. It is supposed to replicate
your
voice which fluctuates greatly. If it does not replicate your voice it is
by
definition DISTORTION!!

Most processors cause 'nasal' and high pitched sounding audio because our
voices
are not 'nasal or high pitched. It is called DISTORTION.



You might want to read this... it's a good explanation of what
VoiceMax is all about.
http://en.wikipedia.org/wiki/VOGAD

I understand DISTORTION quite well! I hold an EE degree, managed an EE
design department for 10 years, and served as Chief Engineer on a major
Military System LGM 118A RS/RV.

Speech compression IS IS IS distortion. PERIOD!


You are correct, of course. But there are instances where distortion
increases intelligibility. as I'm sure an EE knows in spades.

Ed, NM2K

"Deek" wrote in message
. ..
Telstar Electronics wrote:
On Sep 14, 6:42 am, Deek wrote:

I understand DISTORTION quite well! I hold an EE degree, managed an EE
design
department for 10 years, and served as Chief Engineer on a major Military
System
LGM 118A RS/RV.
Speech compression IS IS IS distortion. PERIOD!


I can see why your services were no longer required as Chief
Engineer... thanks for your comments.
www.telstar-electronics.com


I can see why you're more interested in $$ than in accuracy.

If I put a CONSTANT amplitude swept frequency signal, swept from 300 to
3000 Hz, audio bandwidth, to the input to a transmitting device and I get
a VARIABLE amplitude signal, swept from 300 to 3000 Hz, as the audio
output, the device has DISTORTED the audio.

That's just what speech compressors accomplish.

Every single speech processor is a controlled distortion device. You can
market and do salesmanship all you want. You are still selling a device
that distorts the audio.

Distortion is distortion!!

It not only Distorts the audio signal but causes either over deviation on FM
or Splatter on both AM and SSB, and that's the garbage you hear on adjacent
channels.
If you look real close on some built-in CB power meters, instead of the
signal increasing, it actually decreases!
Distortion = Flat topping of the signal...

IDIOT!

"Telstar Electronics" wrote in message
I can see why my services were no longer required

IDIOT!

"Telstar Electronics" wrote in message
s.com...

On Fri, 14 Sep 2007 16:16:32 -0400, Deek wrote:

Telstar Electronics wrote:
On Sep 14, 6:42 am, Deek wrote:

I understand DISTORTION quite well! I hold an EE degree, managed an EE design
department for 10 years, and served as Chief Engineer on a major Military System
LGM 118A RS/RV.
Speech compression IS IS IS distortion. PERIOD!


I can see why your services were no longer required as Chief
Engineer... thanks for your comments.
www.telstar-electronics.com


I can see why you're more interested in $$ than in accuracy.

If I put a CONSTANT amplitude swept frequency signal, swept from 300 to 3000 Hz,
audio bandwidth, to the input to a transmitting device and I get a VARIABLE
amplitude signal, swept from 300 to 3000 Hz, as the audio output, the device has
DISTORTED the audio.

That's just what speech compressors accomplish.

Every single speech processor is a controlled distortion device. You can market
and do salesmanship all you want. You are still selling a device that distorts
the audio.

Distortion is distortion!!

Far be it for me to in any way shape or form, defend the spamming
hype, marketing what is nothing more than a common IC made for the
purpose, but I'm going to disagree with you to some extent.

By your definition, any bandpass filtering, such as you set up in your
example, would cause "distortion." The transfer function with respect
to frequency is nonlinear, i.e. it's distorted.

Unless you're one of the guys gargling on 14.18 MHZ, I hope you would
not argue that frequency response shaping is not something that we
want to do in (voice) communications systems.

So assuming we agree on that, then like the guy negotiating with the
gal he's trying to bed, we now are just negotiating the price, or
acceptable amount of distortion.

Since the purpose of a communication system (unless you're just
peddling hardware) is to communicate, then one has to look at the
trade-off between distortion and intelligibility. If purposefully
"distorting" the signal by frequency shaping, compression, clipping or
any combination thereof improves the intelligibility at the other end
of the circuit then "distortion" is a good thing, semantics aside.


Wes N7WS

On Fri, 14 Sep 2007 16:41:54 -0400, "John Doe"
wrote:
[snip]

It not only Distorts the audio signal but causes either over deviation on FM
or Splatter on both AM and SSB, and that's the garbage you hear on adjacent
channels.

Not necessarily so!

On Thu, 13 Sep 2007 10:36:06 -0700, Telstar Electronics
wrote:

I'm hesitant to reply to this crap but I can't help myself.

Other Processors Have a Problem...
Other speech processors use a low-cost "audio clipping" approach to
achieve compression. While this method is economical for the
manufacturer, clipping distorts the original signal and sounds fuzzy
on the air.

Bafflegab.

http://k6mhe.com/n7ws/

Note 5.

Ed Cregger wrote:

SNIPPED

You are correct, of course. But there are instances where distortion
increases intelligibility. as I'm sure an EE knows in spades.

Ed, NM2K



Ed, of course you are correct. The problem with CB compressors and the folks who
use them is that they don't know or pay attention to the reasonable limits.

My oldest son owns and runs an interstate long haul trucking business. I have
heard more garbage on 27.185 MHz from over compressed, over powered, over
distorted, off frequency, boosted radios while riding shotgun with him than I
care to recall.

Most audio 'power' is in the lower portion of the voice spectrum. Increasing the
mid range by 2 to 4 dB, adding 2 to 4 dB of audio spectral distortion, does
increase received intelligibility AND it does sound un-natural. Also, increasing
the average audio power output from 30% duty cycle to 50 or 60% audio power
output increases the thermal load on the PA final and heat sink by 100% in SSB
and by approximately 40-50% in AM. I don't believe CB rigs have thermal designs
for the heavier duty cycle.

When I chase DX on the ham bands I do not use compression. My transmitted audio
passband is 300 to 2400 Hz [IC 756 P3]. I have four HF radios [IC756P3, IC746,
IC706MKIIg, and KW TS570D] all with built in compression capability.

If I can't work them on SSB I do it the easiest way possible ... CW [Don't need
compression on CW] :-)

I have heard so many over-compressed signals on 75 and 20 meters that I'll turn
on two meters and join a local rag chew or round table where we old farts solve
all the world's problems.