Pseudorandom Noise Shift registers....

[Synthaholic AKA The Shark]

Yet another use for this simple circuit idea available at my web page:
www.flash.net/~chordman called a 'complex waveform generator'.

It is essentially a VCO clocked very short pseudorandom shiftregister
noise generator, but it doesn't generate noise (per se).  It really
(like all of them) generates repeatable waveforms.

The idea behind this one is that these pseudorandom shifters do, in
fact, repeat.  To keep the repeat cycle very short, I built one of
only 4 bits and used toggle switches (4) to control the Xor feedback
configuration.  I then feed each of the 4 shifter outputs to 4 op
amps, each thru it's on 'pan' pot to pan from the inverting to the
non-inverting input.  Then the 4 opamps are summed.  This allows each
of the 4 digital outputs to be level & phase inversion controlled.
The summed output then provides a harmonic rich, timbre treakable (the
pan pots) complex waveform.  There are 15 usable combinations of
switch settings, each offering different harmonic relationships to the
fundamental clock source, which is a VCO.  3rds, 5ths, 7ths, etc. can
be derived and they track the VCO *perfectly*.

- Scott Gravenhorst (Synthaholic)

Programming: The Ultimate Computer Game.  Unfortunately, you never win.
Hell: Windows 95, 16 bit apps and Banyan Vines

A Quote: "I didn't do it."     -- Bart Simpson