[sdiy] digital delay, was ...

[Cornutt, David K]

From: harrybissell [mailto:harrybissell at prodigy.net]

> One twilight zone idea of mine would be to separate the audio into
> several different bands (low mid high) and set the gains so that each
> BBD wouls see maximum signal (the highs presumably would be
> lower amplitude than the lows)... then when summing them back together
> you would account for the different gains to get a delayed signal with
> higher signal amplitude (better S/N)

Hmm... Isn't this basically what Dolby-A does?  If one wanted
to experiment, I'll bet that an old Dolby-A unit wouldn't be
too terribly hard to find...

To make it even more bizarre, do an analysis on the BBD device
to get a general idea of what its noise spectrum looks like.
Find the frequency band in which the device has the best S/N.
Then, divide the input signal up into bands, and pitch shift
them all into the optimum band and run them each through their
own channel.  On the output side, pitch shift them back to
their original frequencies and mix them back together.