User`s guide

Complex Cepstrum
5-84
5Complex Cepstrum
Purpose Compute the complex cepstrum of an input.
Library Transforms
Description The Complex Cepstrum block computes the complex 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 input is altered by the application of a linear phase term so that there is
no phase discontinuity at ±π radians. That is, each input channel is
independently zero padded and circularly shifted to have zero phase at
π radians.
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
complex cepstrum of
the corresponding input column.
y = cceps(u,Mo) % Equivalent MATLAB code
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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