formants

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Format tracking algorithm.

Usage
formants(cf, ca, f0, mflag, bias, lmin)
cf
a matrix containing the frequencies of the formant candidates in Hz
ca
a matrix containing the amplitudes of formant candidates in dB
  • each row of cf/ca contains the candidates of one frame
  • number of frames: N=nrow(cf)
  • maximum number of candidates M=ncol(cf)
  • ca must be a matrix with the same dimensions as cf or a scalar (if amplitudes should not be used for formant tracking)
f0
f0 vector
  • f0 must be a vector with length N containing the f0 values or a scalar (if f0 should not be used for formant tracking)
  • if f0 is supplied, the formant tracking is only applied to voiced regions
mflag
selects the tracking method
  • currently only one method (mflag=0) is implemented (see sp-atom FORMANTS for more details)
  • a second method using a formant modell is under development
bias
tracking bias in Hz; This value is used to check if two candidates can be connected (|cf[i1,j1]-cf[i2,j2]) / (cf[i1,j1]+cf[i2,j2]+2*bias) must be lower than 0.1).
lmin
the minimum length of a track in frames
Result
The f0 vector. The vector contains the f0 values in Hz. The vector length depends mainly on the length of the signal vector x and the hopsize dt. For unvoiced frames the f0 values are set to zero.
See also
f0ac, lpc, cepstrum, ipeaks, FORMANTS

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