Research/Patents/US 5365592
US 5365592Tier 1 — UAP Program Assignee

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Rescinded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

Technology Domains

Click a domain to browse all patents in this category.

Back to patent indexSource: USPTO 35 USC §181 secrecy order records