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:
Mar. 06, 2001
Filed:
Aug. 25, 1999
Applicant:
Inventor:
Masoud Ahmadi, Harlow, GB;
Assignee:
Nortel Networks Limited, Ontario, CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G10L 2/102 ;
U.S. Cl.
CPC ...
G10L 2/102 ;
Abstract
Tone detection in a telecommunication system uses an auto correlation algorithm to detect pitch period, then matches this with known pitch periods for the tones. Enhanced reliability or speed of detection and reduction in computational load can be achieved. This can improve quality of echo cancellation where cancellers treat tones differently to speech. Similarly with speech coding, since implementation of some coding standards involves tones being treated differently to speech. The auto correlation output can be used both for noise detection and tone detection, to save computational resource.