User`s guide

Real Cepstrum
5-365
5Real Cepstrum
Purpose Compute the real cepstrum of an input.
Library Transforms
Description The Real Cepstrum block computes the real cepstrum of each channel in the
real-valued M-by-N input matrix,
u. For both sample-based and frame-based
inputs, the block assumes that each input column is a frame containing M
consecutive samples from an independent channel. The block does not accept
complex-valued inputs.
The output is a real M
o
-by-N matrix, where M
o
is specified by the FFT length
parameter. Each output column contains the length-M
o
real cepstrum of the
corresponding input column.
y = real(ifft(log(abs(fft(u,Mo))))) % Equivalent MATLAB code
or, more compactly,
y = rceps(u,Mo)
When the Inherit FFT length from input port dimensions check box is
selected, the output frame size matches the input frame size (M
o
=M). In this
case, a sample-based length-M row vector input is processed as a single channel
(i.e., as an M-by-1 column vector), and the output is a length-M row vector. A
1-D vector input is always processed as a single channel, and the output is a
1-D vector.
The output is always sample-based, and the output port rate is the same as the
input port rate.
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