DIGITAL VOICE DETECTION APPARATUS AND METHOD USING TRANSFORM DOMAIN PROCESSING
Assignee
Hughes Aircraft
Filed as: HUGHES AIRCRAFT COMPANY
Filed
Jul 19, 1990
Granted
Nov 15, 1994
Location
WHITTIER CA US
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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Apr 17, 1991
Rescinded
May 19, 1994
Duration
3 years, 1 month
Inventor
- 1ROBERT W. HORNER
Record Details
- Patent number
- US 5365592
- Application
- 07555114
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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