[sdiy] 1-2-4 !

[Yves Usson]

Hi,

yes it's been done and perfected by Bode in his famous pitch shifter.
I have myself designed such a device with two cheap SA602
oscillator/modulator. It is worth making such circuit,
it is not as sophisticated than a pitch shifter but gives nice sound
effects.
You may also check this old elektor article (in french !)  at
http://www-timc.imag.fr/Yves.Usson/personnel/SDIY/archives/cryptophonie.pdf

Cheers

 >Hi guys,
 >
 >Thank you all for kindely answering my question.
 >
 >BTW, here's an idea I've had in mind for quire some
 >time, and was wondering if it's worth testing it...
 >I guess it's related to a 4 quadrant multiplier / ringmod...
 >The best I could describe it is as a coder / decoder :
 >a carrier is used for the coder (a sine for instance),
 >and another carrier is used for the decoder, but slightly
 >different : slightly different freq and/or phase, different
 >harmonic content... Could this make some "ghost harmonics"
 >appear in the decoded signal, a bit like on short-wave radio,
 >when the receiver is not 100% exactly tuned to the radio
 >station frequency ?
 >
 >Has this been done already (and am I re-inventing the wheel
 >as always) or is it just crap ?
 >
 >Thanks,
 >JB
 >
 >
 >