////////////////////////////////////////////////////////////////////// PitchTrack is a monophonic autocorrelation pitch tracker with  //// a fast response and extremely high accuracy, even at low       //// frequencies. It is adapted from [helmholtz~] for Pd by Katja,  //// documented at http://www.katjaas.nl/helmholtz/helmholtz.html   ////////////////////////////////////////////////////////////////////// // Options// get(): (read only) get calculated frequency//// fidelity: (float) [0-1], default 0.95//   This is a threshold for certainty about the result. A highly periodic//   signal (ie one that has a strong pitch center) should produce a result//   with a high fidelity, which a non-periodic signal (eg noise) will have//   a very low fidelity. Setting this parameter close to 1 should reduce//   the number of inaccurate reports.//// sensitivity (float) [0-1], default 0.003//   This is the minimum RMS value to trigger a pitch calculation. Setting//   this parameter low forces PitchTrack to attempt to find the pitch of//   even very quiet sounds. Higher values will cause it to trigger only//   on louder notes.//// overlap (int) [1-?], default 2//   How much to overlap successive analysis frames. Higher values should//   produce smoother values, at the cost of an increase of CPU load.//// frame (int) [128-?], default 2048//   Size of FFT frame for analysis. Smaller values result in lower latency//   and high responsiveness but less accuracy. Higher values result in//   considerably greater CPU load. Values that aren't powers of 2 get//   rounded up to the next power of 2. Recommend 512, 1024, or 2048.//// bias (float) [0-1], default 0.2//   Katja's pitch tracker introduces a small bias to help with the tracking.//   (See the link above.) I don't know how this parameter affects the output. // ExampleSinOsc osc => dac; // create an oscillator// PitchTrack must connect to blackhole to runosc => PitchTrack pitch => blackhole; 0.5 => osc.gain; while (true){	// set the oscillator to a random frequency	Math.random2f(200,1000) => osc.freq;	<<< "Actual oscillator frequency:",osc.freq(),"Hz" >>>;	250::ms => now; // pass a little time	<<< "PitchTrack thinks it's this:",pitch.get(),"Hz" >>>;	<<< "Difference:",Math.fabs(osc.freq() - pitch.get()),"Hz\n" >>>;	2::second => now;}