[sdiy] Ridiculously PC (Phase Correct)

[Don Tillman]

Has anybody ever seen a completely phase correct VCO?  That is, a VCO
with the usual output waveforms, but the phases of these outputs are
such that:

For audio signals, the fundamental components of all waveforms are in
phase, so that panning, switching, or mixing the individual waveforms does
not result in any FM artifacts or unexpected changes in the amplitude
of the fundamental.

Or for LFO control signals, the 0-volt starting points of the various
waveforms occur simultaneously, so that panning, switching or mixing
the outputs does not change the effective rhythm of the LFO modulation
or change the timing the 0-volt starting point.

This is actually a tough problem because the standard way to derrive a
triangle wave from a sawtooth shifts the phase of the fundamental
component 90 degrees.

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com