Example G09.pitchshift.pd (Figure 7.33) shows a realization of the pitch shifter described in Section 7.9. A delay line (defined and written elsewhere in the patch) is read using two vd~ objects. The delay times vary between a minimum delay (provided as the ``delay" control) and the minimum plus a window size (the ``window" control.)
The desired pitch shift in half-tones ($h$) is first converted into a
transposition factor
Once $f$ is calculated, the production of the two phased sawtooth signals and the corresponding envelopes parallels exactly that of the overlapping sample looper (example B10.sampler.overlap.pd, Page [*]). The minimum delay is added to each of the two sawtooth signals to make delay inputs for the vd~ objects, whose outputs are multiplied by the corresponding envelopes and summed.
