puredata-doc 0.46.2-1 / usr / share / puredata / doc / 3.audio.examples / I09.sheep.from.goats.pd

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#X text 362 148 normalize the amplitudes;
#X text 439 253 add neighboring amplitude to this one;
#X text 437 269 and take squared magnitude of result -;
#X text 437 286 do this for both the left neightbor and;
#X text 436 303 the right one;
#X text 94 82 forward real Hann-windowed FT;
#X text 284 658 I had trouble with the DC bin - this zeros it.;
#X text 594 366 adjust threshold to quadratic;
#X text 594 382 units and scale;
#X text 142 389 total incoherence;
#X text 496 414 compare incoherence with the threshold;
#X text 532 511 multiply by left and right;
#X text 531 529 neighbors \, so 0 if any of;
#X text 531 546 the 3 is "clean".;
#X text 497 429 If greater (dirty) \, the "clip" outputs;
#X text 498 444 1 \, otherwise (if clean) \, zero.;
#X text 161 583 add to let in channels;
#X text 159 597 for either criterion;
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#X text 105 15 TEST SIGNAL: looped sample plus noise. The inlets control
amplitude of each in dB.;
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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 text 354 563 updated for Pd version 0.39;
#X text 11 212 Two separate thresholds may be adjusted to listen to
the "clean" or "dirty" part of the signal. You'll hear anything less
incoherent than the clean threshold \, OR more incoherent than the
dirty one.;
#X text 13 35 This patch applies a very simple coherence test to distinguish
between sinusoids and noise in an input signal. It works very imperfectly
(since noise is random \, no matter what test we place on it it will
sometimes spoof its way in.) Here we just test that neighboring channels
are 180 degrees (pi radians) out of phase \, as they should be in the
main lobe in response to a sinusoid. If any three channels are so arranged
\, all three are considered as contributing to a sinusoid. To do this
we make an "incoherence" measure which is zero if the phase relationship
is perfect and progressively larger otherwise.;
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