Re: Overdue Invention

In article <1220876234.651486@xxxxxxxxxxxx>,
Francis Burton <fburton@xxxxxxx> wrote:
So what do you want to happen in a drama when there is a wide range of
sounds going from whispers to explosions? They wouldn't sound very
realistic if they were normalised to the same volume, and there would be
no surprise "boo!" moments which make you jump (usually with accompanying
music at an unexpected point) if your TV flattened everything to one
level.

You only want to limit the volume of the loudest sections and
leave the quiet bits quiet. The circuit would reduce the gain
slightly, but very rapidly when the power goes above a set
threshold for a short period of time (>0.25s?) and restore it
more slowly when the power is below the threshold.

Not surprisingly, there are circuits/devices that can do that.
See e.g. http://www.ethanwiner.com/compressors.html
and http://en.wikipedia.org/wiki/Dynamic_range_compression

I imagine it would be fairly easy to tweak the response curve
to produce an acceptable ad-listening experience.

Francis
.

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