"John Byrns" wrote in message
...
In article ,

2. The idea expressed above that a "modern sophicated decompressor
circuit could match the curve of the compressor" seems far fetched to me.
In the days of yore when audio processing consisted of a single broad band
compressor, and a broad band "peak limiter" one might have contemplated
this, at least as far as the compression part went, but today's audio
processing is much more complex. Processing today involves broad band
AGC, multiband compressors, plus multiband and broadband clippers in place
of the old "peak limiter". It isn't clear to me that this would be easy
to undo, or even possible. I don't know if the multiband aspect creates
problems for reversing the process or not, but how do you undo clipping,
and if there are any feed forward compressors involved it is possible that
the output isn't even a single valued function of the input, making
recovery mathematically impossible.


Sure, the modern decompressor might be farfetched. There's no doubt that
some things can't be recovered. Maybe the best that can be done is to more
or less de-process the AM radio signal. I think audio processing is a
bigger problem than bandwidth, distortion or noise for a real high fidelity
AM tuner. And I think it's a problem which deserves it's fair share of
consideration.

Frank Dresser