Buchla 200e series, User Manual

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297 Infinite Phase Shifter
297091218
The Infinite Phase Shifter displaces the phase of an applied signal by up to
1800 degrees, depending on frequency and number of stages selected. The
phase shifted signal may be combined with the original to create a moderately
warped comb filter with complimentary outputs. Notch density and depth can
be varied through feedback (resonance) and stage selection. A wide range
sweep oscillator enables the familiar cyclical phase shift effect.
All parameters (phase shift, notch depth, sweep rate, sweep depth,
resonance) are voltage controlled, with processing control inputs where
appropriate. A built-in envelope follower facilitates the creation of amplitude-
dependant effects.
The 297 is capable of “barber pole” phasing, with the phase shift (and the
consequent filter peaks and notches) continuously moving in one direction.
Unique circuitry provides (or consumes) the extra time involved in this
process. The rate of changes can be varied up to 2.5 octaves per second in
either direction and is voltage controllable.
Note: the 297 is not an “e” module and does not save it’s parameters .