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

Revision as of 14:56, 20 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

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 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, FORMANTS

@@ Line 7: / Line 7: @@
 ::*number of frames: N=<code>nrow(''cf'')</code>
 ::*maximum number of candidates M=<code>ncol(''cf'')</code>
-::*''ca'' must be a matrix with the same dimensions as ''cf'' or a scalar (if amplitudes should not be used for formant tracking)
+::*''ca'' must be a matrix with the same dimensions as ''cf''<BR>or a scalar, if amplitudes should not be used for formant tracking
 :;<var>f0</var>: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)
+::*''f0'' must be a vector with length N containing the f0 values int Hz<BR>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
 :;<var>mflag</var>:selects the tracking method