Toni: moved Programmer Guide/SPU Reference/CCANA - general Cohen class analysis to Programmer Guide/SPU Reference/CCANA

2011-04-28T09:27:38Z

moved Programmer Guide/SPU Reference/CCANA - general Cohen class analysis to Programmer Guide/SPU Reference/CCANA

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====CCANA - general Cohen class analysis====

A general Cohen class analysis SPAtom.

=====Usage:=====

<code>SPU CCANA <var>WAVE</var> <var>HOPSIZE</var> <var>ITYP</var> <var>FTYP</var> <var>ANALYTICSIGNAL</var> <var>MAXSIZE</var> <var>DTYP</var> <var>LSIG</var> <var>WSIG</var> <var>LSMO</var> <var>WSMO</var> <var>EPS</var> <var>DB</var> <var>AMAX</var> <var>AREF</var></code>

=====Inputs:=====

;<var>WAVE</var>

:The input signal wave item (mono).

;<var>HOPSIZE</var>

:The distance between frames in samples.

;<var>ITYP</var>

:The input frame alignment (values: BEGIN, CENTER).

;<var>FTYP</var>

:The input filter (NONE, DOUBLESRATE, HALFBANDWIDTH, ANALYTICSIGNAL).

;<var>MAXSIZE</var>

:The maximum signal queue length.

;<var>DTYP</var>

:The Cohen class distribution type (WIGNERVILLE, CHOIWILLIAMS).

;<var>LSIG</var>

:The signal window length in samples.

;<var>WSIG</var>

:The signal window type. The following values are supported(RECTANGLE, HANNING, HAMMING).

;<var>LSMO</var>

:The smoothing window length in samples.

;<var>WSMO</var>

:<var>DTYP</var>=<code>WIGNERVILLE</code> -> smoothing window type (RECTANGLE, HANNING, HAMMING)

:<var>DTYP</var>=<code>CHOIWILLIAMS</code> -> smoothing window coef. sigma (0 < sigma)

;<var>EPS</var>

:<var>DTYP</var>=<code>WIGNERVILLE</code> -> not used

:<var>DTYP</var>=<code>CHOIWILLIAMS</code> -> minimum smoothing window value

;<var>DB</var>

:1 if the amplitude scale is in dB, 0 otherwise. The default is 0.

;<var>AMAX</var>

:An amplitude value > 0. The default is 1.

;<var>AREF</var>

:A reference amplitude > 0. The default is 1.

=====Outputs:=====

;<var>Y</var>

:The amplitudes.

;<var>DT</var>

:The time resolution in seconds

;<var>DF</var>

:The frequency resolution in Hz.

;<var>LMAX</var>

:The maximum frame length in samples.

;<var>I</var>

:The number of processed frames.

;<var>N</var>

:The maximum number of frames.

;<var>SR</var>

:The sampling rate in Hz.

=====Function:=====

The SPAtom CCANA implements a Psuedo Wigner-Ville Distribution (PWD), a Smoothed Pseudo Wigner-Ville Distribution (SPWD) and a Choi-Williams Distribution (CWD).

Pseudo Wigner-Ville Distribution (PWD)

[[File:5501.png]]

where

k - Frequency index, k = 0..N/4

hn - Symmetrical, real signal window function of length 2N-1

xn - The complex signal of length 2(N-1)+1

n - The time index (sample index), n = -(N-1)..(N-1)

N - The transformation length

Smoothed Pseudo Wigner-Ville Distribution (SPWD)

[[File:5503.png]]

where

k - The frequency index, k = 0..N/4

hn - The symmetrical real signal window of length 2N-1

gm - The symmetrical real smoothing window of length 2M-1

xm±n - The real/complex signal of length 2(M-1)+2(N-1)+1

m - The shift index, m = -(M-1)..(M-1)

n - The time index (sample index), n = -(N-1)..(N-1)

M - The smoothing length

N - The transformation length

Choi-Williams Distribution (CWD)

[[File:5504.png]]

where

k - The frequency index, k = 0..N/2

hn - The symmetrical real signal window of length 2N-1

s - The distribution parameter (>0)

xm±n - The real/complex signal of length 2(M-1)+2(N-1)+1

m - The shift index, m = -(M-1)..(M-1)

n - The time index (sample index), n = -(N-1)..(N-1)

M - The smoothing length

N - The transformation length.

Programmer Guide/SPU Reference/CCANA - Revision history

Toni: moved Programmer Guide/SPU Reference/CCANA - general Cohen class analysis to Programmer Guide/SPU Reference/CCANA

Admin: 1 revision: Initial import

193.171.195.8: initial import