index :: an

an.pitchtrack~

aliases: [ceammc/helmholtz~], [helmholtz~]

pitch tracker

available since version: 0.7

---

information

Period-length detector using Philip McLeod's Specially Normalized AutoCorrelation function (SNAC)

arguments:

• FRAMESIZE frame size in samples
  type: int
  units: samp
  

properties:

• @framesize Get/set frame size in samples
  type: int
  units: samp
  enum: 128, 256, 512, 1024, 2048
  default: 1024
  

• @overlap Get/set overlap of analysis frames
  type: int
  enum: 1, 2, 4, 8
  default: 1
  

• @bias Get/set bias which favours small lags over large lags in the period detection, thereby avoiding low-octave jumps
  type: float
  range: 0..1
  default: 0.2
  

• @fidthr Get/set min fidelity threshold to report the pitch
  type: float
  range: 0..1
  default: 0.95
  

• @maxfreq Get/set max tracked frequency
  type: float
  units: Hz
  range: 10..10000
  default: 1500
  

inlets:

• input signal
  type: audio

outlets:

• output signal
  type: audio
• output frequency in Hz
  type: control
• track fidelity: a value between 0 and 1, indicating to which extent the input signal is periodic. A fidelity of ~0.95 can be considered to indicate a periodic signal.
  type: control

keywords:

pitchtrack

See also: [sigmund~] [fiddle~]

Authors: Katja Vetter, Serge Poltavsky

License: GPL3 or later