Programmer Guide/Command Reference/EVAL/formants: Difference between revisions
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;Usage:<code>formants(<var>cf</var>, <var>ca</var>, <var>f0</var>, <var>mflag</var>, <var>bias</var>, <var>lmin</var>)</code> | ;Usage:<code>formants(<var>cf</var>, <var>ca</var>, <var>f0</var>, <var>mflag</var>, <var>bias</var>, <var>lmin</var>)</code> | ||
:;<var>cf</var>:a matrix containing the frequencies of the formant candidates in Hz | :;<var>cf</var>:a matrix containing the frequencies of the formant candidates in Hz | ||
::*number of frames: N=<code>nrow(''cf'')</code> | ::*number of frames: N=<code>nrow(''cf'')</code> | ||
::*maximum number of candidates M=<code>ncol(''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 | ::*each row of ''cf'' contains the candidates of one frame | ||
::*if <code>''cf''[i,k]=0 (0≤i<N, 0≤k<M)</code> the number of candidates in frame i equals k | |||
::*the frequencies of frame i must be in ascending order: <code>''cf''[i,j]<''cf''[i,j+1] (0≤j<k-1)</code> | |||
:;<var>ca</var>:a matrix containing the amplitudes of formant candidates in dB | |||
::*''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 | :;<var>f0</var>:f0 vector | ||
::*''f0'' must be a vector with length N containing the f0 values or a scalar | ::*''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 | ::*if ''f0'' is supplied, the formant tracking is only applied to voiced regions | ||
:;<var>mflag</var>:selects the tracking method | :;<var>mflag</var>:selects the tracking method | ||
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:;<var>lmin</var>:the minimum length of a track in frames | :;<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. | ;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>]] | [[../#Functions|<function list>]] | ||
Latest revision as of 20:16, 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)
- number of frames: N=
- 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
- ca must be a matrix with the same dimensions as cf
- 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
- f0 must be a vector with length N containing the f0 values int Hz
- 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
- lmin
- 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, lpc, cepstrum, ipeak, sp-atom FORMANTS
