MN3005, MN3007 BBD.. anyone built one?

[Jeremy Brookes]

>> > I was puzzling over what the NE570N
>> > compander was doing there. Is it normal
>> > to compress the signal before it
>> > goes through the delay stage?
>>
>> Compression at input followed by expansion at output is a noise
>> reduction technique.  Here's my non-technical understanding of this
>> process: Basically you compress the signal before it enters a device
>> which introduces noise (like a delay line), then expand the signal after
>> it leaves the device.  This (ideally) causes no change in the desired
>> signal, but the noise which was introduced while the signal was
>> compressed will become proportionally quieter to the desired signal
>> after expansion.
>>
>
>The infinite delay is not practical realizeable without a kind of
>compression. You could dial the feddback only close to infinity, on one
>side the signal would slowly fade, on the other it wold rise and rise,
>until total distortion/and or oscillation. I think it needs a jard limiter
>before the delay to get a real infinite delay without this problems.


The infinite repeat was from Michael Rogers who was referring to a DOD
digital delay pedal. Being digital I guess it would be quite easy for the
feedback to be in the digital domain, whereas the compressing and expansion
only apply to the analogue input and output, not the feedback loop. Or I
might be wrong :)