all analog pitch shifting idea (without BBD's)

[Andi]

I seem to recall that the Alesis ModFX Bitrman has frequency shift in it. And it is indeed rather like ring mod (in general terms) - rather atonal if used excessively.

[Transmogrifox]

When I was in my 400-level EE analog RF electronics course I was pondering this as we were studying AM modulation & demodulation.

It came to my head about the time we were talking about homodyne receivers, where the original audio was recovered simply by multiplication with the carrier signal.

My first thought was to make a chorus-like effect where I would modulate the carrier frequency so the pitch of the recovered signal would deviate by small amounts.  I deduced the robot effect of small deviations would not badly impact the recovered sound.

This thought never materialized into a real circuit because the challenge of building tuneable RF oscillators stable enough to do this well intimidated me.

For people interested in noise pedals, I don't see any reason this would necessarily have to be SSB with intense filters.  All you get with the DSB is the combination of the recovered pitch deviating high and low at the same time=more noise.   I imagine this must make an incredible noise-pedal sound.  Stability may not be an issue because we're probably looking for strange and unpredictable stuff.

[Transmogrifox]

When I was in my 400-level EE analog RF electronics course I was pondering this as we were studying AM modulation & demodulation.

It came to my head about the time we were talking about homodyne receivers, where the original audio was recovered simply by multiplication with the carrier signal.

My first thought was to make a chorus-like effect where I would modulate the carrier frequency so the pitch of the recovered signal would deviate by small amounts.  I deduced the robot effect of small deviations would not badly impact the recovered sound.

This thought never materialized into a real circuit because the challenge of building tuneable RF oscillators stable enough to do this well intimidated me.

For people interested in noise pedals, I don't see any reason this would necessarily have to be SSB with intense filters.  All you get with the DSB is the combination of the recovered pitch deviating high and low at the same time = more noise.   I imagine this must make an incredible noise-pedal sound.  Stability may not be an issue because we're probably looking for strange and unpredictable stuff.

EDIT:  OOPS