The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 1977
Filed:
Apr. 03, 1975
Applicant:
Inventors:
Takashi Araseki, Tokyo, JA;
Kazuo Ochiai, Tokyo, JA;
Assignee:
Nippon Electric Company, Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10L / ;
U.S. Cl.
CPC ...
179 / ; 179 / ; 179 / ;
Abstract
A speech detector which rapidly detects the presence of speech signals in telephone channel broadband noise is useful in TASI type systems. The incoming analog speech signal is sampled and binary-coded, then fed simultaneously to two different detectors: (1) A large-amplitude threshold detector (which detects high-energy vowel and plosive sounds): (2) a high-frequency threshold detector (which detects high-frequency fricative sounds above a 2 Khz threshold, assuming inherent noise in a 4 Khz telephone channel is mostly flat/broadband and 8 Khz sampling noise is filtered out).