Toni: moved Programmer Guide/SPU Reference/CEPSTRUM - cepstrum and smoothed spectrum to Programmer Guide/SPU Reference/CEPSTRUM

2011-04-28T09:57:08Z

moved Programmer Guide/SPU Reference/CEPSTRUM - cepstrum and smoothed spectrum to Programmer Guide/SPU Reference/CEPSTRUM

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2010-05-17T13:05:27Z

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====CEPSTRUM - cepstrum and smoothed spectrum====

The <code>CEPSTRUM</code> atom computes the real cepstrum or the cepstrum smoothed spectrum of the input-spectrum <var>X</var>. The input <var>X</var> must be (!) a logarithmic magnitude spectrum with length n<var>X</var> = 2M+1. If the inputs <var>N</var> and <var>I</var> are not connected, the real cepstrum is computed and the 1st half (n<var>X</var>-1 coefs.) is stored in <var>Y</var>. The cepstrum is multiplied with the scaling factor <var>C</var> (def.=1). If the input <var>N</var> (number of coefs.) is connected, a smoothed (filtered) spectrum is computed and stored in <var>Y</var> (nX samples). For the computation of the smoothed spectrum, the cepstrum coefficients with index <var>I</var> to <var>I</var>+<var>N</var>-1 are used (<var>I</var>>=0, <var>N</var>>0, <var>I</var>+<var>N</var><=nX-1). The smoothing parameters <var>N</var> and <var>I</var> can be changed in each evaluation cycle.

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

<code>CEPSTRUM <var>X</var> <var>N</var> <var>I</var> <var>C</var></code>

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

;<var>X</var>

:A logarithmic magnitude spectrum.

;<var>N</var>

:The number of cepstrum coefficients (coefs.) for smoothing.

;<var>I</var>

:The index of 1st cepstrum coef. for smoothing=0.

;<var>C</var>

:The factor or shift-level; default=1(factor) or 0(dB).

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

;<var>Y</var>

:A real cepstrum (1st half) or smoothed/filtered spectrum.

Programmer Guide/SPU Reference/CEPSTRUM - Revision history

Toni: moved Programmer Guide/SPU Reference/CEPSTRUM - cepstrum and smoothed spectrum to Programmer Guide/SPU Reference/CEPSTRUM

Admin: 1 revision: Initial import

193.171.195.8: initial import