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#X text 412 338 contract;
#X text 416 383 expand;
#X text 491 318 detune;
#X text 52 371 location;
#X text 49 387 (stops;
#X text 54 402 motion);
#X text 162 389 motion in;
#X text 234 487 read input sound;
#X text 103 7 PHASE VOCODER FOR TIME STETCHING AND CONTRACTION;
#X text 636 518 length \, msec;
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#X text 645 347 <- set;
#X text 97 347 ------- location controls -------;
#X text 658 452 (check);
#X text 21 35 This patch takes a sound \, analyzes windows in it both
for channel magnitude and for phase precession in each channel (compared
to another operlapping window). The real-time output recreates the
same magnitudes and phase precession \, althought the phases themselves
are in general different. You can control either the location or its
motion (setting location stops motion \, while setting a non-zero motion
causes the location to change automatically). "Rewind" goes back to
the beginning. You can use different window sizes (use the message
boxes - the number box is for readout). The "lock" feature forces phase
coherency between neighboring channels \, which makes a more present
sound but can add artifacts to the sound. Look in "pd fft-analysis"
to see the workings.;
#X text 500 614 updated for Pd version 0.39;
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#X text 644 15 recall previous output amplitude. Its phase will be
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recorded sound.;
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#X text 619 76 divide by the magnitude to make a unit-magnitude complex
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#X text 619 175 Take FT of the window in back. Multiply its conjugate
by the normalized previous output. The result has the magnitude of
the input sound and phase (previous output phase) minus (back window
phase).;
#X text 621 380 Normalize again \, this time taking care to salt each
channel with 1e-15 so that we get a unit complex number even if everything
was zero heretofore.;
#X text 659 433 Now take the FT of the forward window and multiply
it by the unit complex number from above. The magnitude will be that
of the forward window and the phase will be the previous output phase
plus the phase difference between the two analysis windows -- except
that if "lock" is on \, they will be modified to agree progressively
better with the inter-channel phase relationships of the input.;
#X text 621 252 If "lock" is on \, encourage neighboring channels to
stay in phase by adding the two neighboring complex amplitudes. The
result will tend toward the channel with the strongest amplitude. If
the phase relationships between channels in the output and those in
the input are in parallel \, then neighboring channels of the quotient
will all have the same phase and this will not change any phases. (lrshift
shifts the signal to the left or right depending on its argument.)
;
#X text 673 574 'set' message to block;
#X text 676 591 allows variable size;
#X text 631 136 Read two windows \, one 1/4 length behind the other
\, of the input sound \, with Hann window function (see inside).;
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#X text 231 478 back up 1/2 window;
#X text 43 6 Read two windows out of the recorded sample \, one 1/4
ahead of the other. The mid point of the front window is specified
by "location". If "speed" is nonzero \, "location" automatically precesses.
;
#X text 93 648 "back" window 1/4 cycle behind "front" one;
#X text 137 205 computation period (msec) for overlap of 4;
#X text 164 186 msec in a window;
#X text 326 275 loop to precess the location according;
#X text 325 291 to the "speed" parameter.;
#X text 759 28 if location changes \, update number box;
#X text 758 47 in main window via "location-set" \, but;
#X text 761 66 taking care to limit frequency of updates.;
#X text 792 538 reflect control changes;
#X text 792 555 in main window.;
#X text 756 405 setting location by hand;
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