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:
Feb. 21, 2006
Filed:
Aug. 23, 2001
Raghavendra S. Prabhu, Costa Mesa, CA (US);
Adam Strauss, Brea, CA (US);
Stan Hsieh, Diamond Bar, CA (US);
Zhen Zhu, Irvine, CA (US);
Anurag Bist, Irvine, CA (US);
Raghavendra S. Prabhu, Costa Mesa, CA (US);
Adam Strauss, Brea, CA (US);
Stan Hsieh, Diamond Bar, CA (US);
Zhen Zhu, Irvine, CA (US);
Anurag Bist, Irvine, CA (US);
Intel Corporation, Santa Clara, CA (US);
Abstract
Disclosed is an integrated tone detection processor for discriminating between tone and voice signals and determining the tones. The tone detection processor performs Automatic Gain Control (AGC) to normalize the power of the tone or voice signal. Further, the energy of the tone or voice signals are determined at specific frequencies utilizing a Goertzel Filter process. The tone detection processor determines whether or not a tone is present, and if a tone exists, determines the type of tone. Based upon determining the two maximum energy levels of the Goertzel filtered tone, whether the tone is a single tone, dual tone, silence, or other (e.g. speech) can be discriminated. The tone can then be identified by a user-defined dictionary of tones. Based upon various ON and OFF cadence checks in combination with the use of TONE ON and TONE OFF counters, tones can be declared.