[sdiy] digital delay, was ...

[Glen]

At 09:45 PM 9/13/03 , harrybissell wrote:
>Hi Glen....

>I think the compander time constants are a problem not for each individual
>band... but for the difference between (lets say) the 40Hz band and the
>10KHz band.  The 40Hz band will need a time constant in the hundreds of
>milliseconds range... the 10K might only need milliseconds.

You *do* realize that what we might call the "40Hz" band has already been
pitch shifted to a much higher frequency range by the time we apply the
compression? There are no 40Hz signals left anymore, they are all much
higher now. The 10K signals are also gone. They've *also* been shifted to
the center of the audio spectrum. 

All the various compressors see a much more similar incoming spectrum due
to the pitch shifting which has already taken place. There would be no need
to have such a wide range of response times between the compressors,
because they would all be processing narrow-band midrange signals at this
point.

I know that I'm expecting a lot from the pitch shifters--way too much from
real-world devices, I'm sure. Heck, I'm expecting a LOT from everything
EXCEPT the BBDs in this elaborate scheme.  :) 

I think it might actually be fun to try this, but I don't have the money
and time to tackle it. I'd like to see what little (or large) unexpected
artifacts it would have--what sort of unique character it might have. I
suspect it might sound quite "organic" due to the complexity and sheer
amount of  circuitry involved.

I really wouldn't think of using hand-built tube BBDs. I'm not that crazy.
I might consider using a simple tube input or output stage for some
coloration though.


later,
Glen