Programmer Guide/Command Reference/EVAL/formants: Difference between revisions

Revision as of 11:07, 21 April 2011

Format tracking algorithm.

Usage

formants(cf, ca, f0, mflag, bias, lmin)

cf

a matrix containing the frequencies of the formant candidates in Hz

number of frames: N=nrow(cf)
maximum number of candidates M=ncol(cf)
each row of cf contains the candidates of one frame
if cf[i,k]=0 (0<=i<N, 0<=k<M) the number of candidates in frame i equals k
the frequencies of frame i must be in ascending order: cf[i,j]<cf[i,j+1] (0<=j<k-1)

ca

a matrix containing the amplitudes of formant candidates in dB

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 int Hz
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

Result: A matrix with N rows and L columns. Each column l contains the formant track with order l+1. L is the maximum formant order or the maximum number of parallel tracks.
See also: f0ac, lpc, cepstrum, ipeak, sp-atom FORMANTS

@@ Line 19: / Line 19: @@
 :;<var>lmin</var>:the minimum length of a track in frames
 ;Result: A matrix with N rows and L columns. Each column ''l'' contains the formant track with order ''l''+1. L is the maximum formant order or the maximum number of parallel tracks.
-;See also: [[../f0ac|f0ac]], [[../lpc|lpc]], [[../cepstrum|cepstrum]], [[../ipeak|ipeak]],  [[Programmer_Guide/SPU_Reference/FORMANTS|FORMANTS]]
+;See also: [[../f0ac|f0ac]], [[../lpc|lpc]], [[../cepstrum|cepstrum]], [[../ipeak|ipeak]],  [[Programmer_Guide/SPU_Reference/FORMANTS|sp-atom FORMANTS]]
 [[../#Functions|<function list>]]