Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1990-07-19
1994-11-15
Swann, Tod R.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 49, G10L 500
Patent
active
053655923
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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patent: 4884247 (1989-11-01), Hadidi et al.
"Cepstrum Pitch Determination", The Journal of the Acoustical Society of America vol. 41; 1967 pp. 293-309; A. Noll.
"Digital Signal Processing," Oppenheim & Schafer, Prentice-Hall, 1975, pp. 512-519.
Bergen Ronald L.
Cai Kheim V.
Horner Robert W.
Lane Keith A.
Denson-Low W. K.
Hughes Aircraft Company
Swann Tod R.
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