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In the conventional autocorrelation
method when a finite segment is extracted over
multiple pitch periods, the obtained autocorrelation
sequence is actually an „„aliased‟‟ version of the true
autocorrelation of vocal tract system impulse response.
This is because the replica of autocorrelation of vocal
tract impulse response is repeated periodically with the
periodicity equivalent to pitch period, which overlaps
and distorts the underlying autocorrelation of the
speech waveform. As the pitch period of high-pitched
speech is small, the periodic replicas cause „„aliasing‟‟
of the autocorrelation sequence.
ممنون
In the conventional autocorrelation
method when a finite segment is extracted over
multiple pitch periods, the obtained autocorrelation
sequence is actually an „„aliased‟‟ version of the true
autocorrelation of vocal tract system impulse response.
This is because the replica of autocorrelation of vocal
tract impulse response is repeated periodically with the
periodicity equivalent to pitch period, which overlaps
and distorts the underlying autocorrelation of the
speech waveform. As the pitch period of high-pitched
speech is small, the periodic replicas cause „„aliasing‟‟
of the autocorrelation sequence.
ممنون
