[sdiy] Dumb PWM question

[John Mahoney]

Wherein a dumb question begets a dumb answer:

Are you familiar with multi-band compression? Your description of the 
desired audio effect leads me to think that you want something like that.

John


At 11:43 AM 2/26/2008, jbv wrote:

>Hi list,
>
>This might be a really stupid question, but anyway I was wondering
>if there was any analog & digital circuitry that allows to apply REALTIME
>pulse width modulation on ANY input signal (cyclic or not)... providing
>of course that it makes any sense to apply such processing on signals
>other than square waves...
>The basic idea would be, for instance, to "compress" the lower part of a
>
>sine period by a certain percentage while "expanding" the upper part of
>the same period, but the freq of the sine would remain the same...
>I guess that it would be somewhat more tricky on natural sounds in which
>the lower & upper parts (thru-zero) of the signals may be difficult to
>identify...
>
>Thanks in advance (and apologizes for cluttering the list with such a
>question if it happens to be really stupid)...
>
>JB


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