Digital voice detection apparatus and method using transform domain processing
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United States of America Patent
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Nov 15, 1994
Grant Date -
N/A
app pub date -
Jul 19, 1990
filing date -
Jul 19, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A waveform characterizer apparatus is disclosed for extracting cepstrum pitch and spectral properties of a waveform signal such as the baseband audio output of a receiver. The apparatus employs Fourier processing, cepstral processing, magnitude detection, logarithms processing, frequency selective filtering and time/frequency windowing to extract cepstrum pitch and spectral rolloff characteristics which can then be used to determine the signal type. One application of the invention is in a digital voice/squelch apparatus.
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