Phase Distortion
Following in the footsteps of FM (frequency modulation) synthesis, PD (phase distortion) was the
second method of skewing sine waves developed during the 1980s. If you are interested in details,
start with the Wikipedia articles about
.
Whenever you start a fresh instance of Bazille, a version of the
init
patch is automatically loaded.
In this version, PD is set to maximum, resulting in a bright sawtooth-like wave. Try turning PD all
the way down (as in the above image) for a pure sine wave, then modulate the phase distortion by
connecting e.g. envelope 2 to the socket and turning up the modulation amount.
PD
The
PD
knob on the right controls the nominal amount of phase distortion.
PD modulation
(unlabeled knob)
The bipolar knob on the left sets the amount of modulation from whatever signal is connected to
the socket.
Wave selectors
(upper 2 selectors)
The selectors below the PD knob specify a pair of
alternating (see below) non-linear phase functions.
The first five modes (
Saw, Square, Impulse, 2pulse,
Halfsaw
) are simple, they need no explanation.
In the 3 ‘Res’ modes, multiple sine waves are packed
into differently-shaped ‘windows’. The number of cycles
in the window is controlled by the
PD
parameter.
Note that most wave combinations will be an octave
lower than single waves (
Same
in the lower selector).
Here are two of the many possible wave combinations:
Shape
(lower selector)
Sets the basic oscillator waveform before it is phase distorted:
Cosine
for regular phase distortion i.e. the above waves
....................
TapMap1/2
a
as basic waveform
............
23
SAW
SQUARE
IMPULSE
2PULSE
HALFSAW
RES1
RES2
RES3
SAW + SQUARE
I RES2