On Thu, 5 Jul 2007 20:13:56 +0100, " Peter"
wrote:

+++"cmdr buzz corey" wrote...
+++
+++ You can't change the average level without changing the waveform.
+++
+++Bovine excrement.
+++
+++An amplifier will increase the average level, but by increasing all
+++levels. As many references make clear (some listed below), an
+++amplifier does NOT change the waveform.
+++
**************

Let me be sure that I understand what you are saying.

An amplifier increases or decreases levels, ie voltage and/or current.
Yet the resulting output waveform is identical to the input?

If that is your position then that is utter bovine, canine, feline and
any other *ine excrement you wish to use.

The only way the output waveform is equal to the input waveform is
when the stage is at unity gain and is distortion free, period.
Otherwise the output waveform is different than the input. Either or
both of the voltage and current is greater or less than the input. A
waveform of any continuous time varying signal is defined as a set of
intantaineous points versus time that represent that signal. Simply
putting it.

+++The perfect amplifier or audio processor, would create zero
+++distortion - no change to the waveform. However, the perfect
+++circuit does not exist so some distortion will occur in any active
+++circuit.
+++This includes circuits already in the radio.
+++
*****************

Correct in that a distortion free function is nonexistant in
electronics.

+++A processor may be any circuit that carries out the process the
+++designer (or marketing person) has decided on. This could be as
+++simple as an amplifier... it is carrying out a process.
+++
********

a process called a transfer function.


+++A processor which simply amplifies all signals and clips the higher
+++levels can produce much distortion. A well designed and adjusted
+++processor could produce little more distortion than a simple
+++amplifier.
+++
***************

only if there is sufficient filtering to remove most of the
distortion. Generally distortion results in harmonics and other
highfrequency components of the signal. A properly designed filter of
signifcant response can filter most of the objectinable harmonics
and/or high frequency components.


+++
+++The question is whether "Telstar" and "well designed" go together. I
+++would like to see an independent review from someone without
+++an axe to grind.
************

Now that will depend on examination of the product.

james