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#X text 229 417 back up 1/2 window;
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#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.
;
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#X text 91 587 "back" window 1/4 cycle behind "front" one;
#X text 137 205 computation period (msec) for overlap of 4;
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#X text 321 280 loop to precess the location according;
#X text 320 296 to the "speed" parameter.;
#X text 611 31 if location changes \, update number box;
#X text 610 50 in main window via "location-set" \, but;
#X text 613 69 taking care to limit frequency of updates.;
#X text 756 462 reflect control changes;
#X text 756 479 in main window.;
#X text 754 344 setting location by hand;
#X text 752 362 sets speed to zero.;
#X text 760 653 misc controls;
#X text 496 527 "rewind" control takes us;
#X text 499 545 to a location depending on;
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#X text 494 312 desired transposition and sample;
#X text 494 329 rate correction for soundfile;
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#X text 272 5 recall previous output amplitude. Its phase will be added
to the phase difference we measure from two windows in the the recorded
sound.;
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#X text 247 66 divide by the magnitude to make a unit-magnitude complex
amplitude (phase only). The 1e-20 is to prevent overflows. q8_rsqrt~
is reciprocal square root.;
#X text 247 165 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 249 370 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 288 427 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 249 242 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 387 560 'set' message to block;
#X text 390 577 allows variable size;
#X text 259 126 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 164 364 hundredths;
#X text 493 294 in cents;
#X text 389 359 normal;
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#X msg 173 92 resize \$1;
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#X text 15 8 calculate Hann window table (variable window size) and
constants window-hz (fundamental frequency of analysis) \, window-sec
and window-msec (analysis window size in seconds and msec).;
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#X msg 229 511 ../sound/voice.wav;
#X msg 229 536 ../sound/voice2.wav;
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#X text 460 438 <- record;
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#X text 386 335 contract;
#X text 390 380 expand;
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#X text 494 277 detune;
#X text 55 330 location;
#X text 52 346 (stops;
#X text 57 361 motion);
#X text 165 348 motion in;
#X text 232 464 read input sound;
#X text 103 7 PHASE VOCODER FOR TIME STETCHING AND CONTRACTION;
#X text 604 479 length \, msec;
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#X text 607 274 window size \,;
#X text 607 289 samples;
#X text 648 306 <- set;
#X text 100 306 ------- location controls -------;
#X text 660 419 (check);
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#X text 23 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 483 568 updated for Pd version 0.39;
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