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:
Dec. 08, 2015
Filed:
Apr. 18, 2008
Sethu K. Madhavan, Canton, MI (US);
Jijun Yin, San Diego, CA (US);
Qin Jiang, Woodland Hills, CA (US);
Darrel James Van Buer, Los Angeles, CA (US);
Sethu K. Madhavan, Canton, MI (US);
Jijun Yin, San Diego, CA (US);
Qin Jiang, Woodland Hills, CA (US);
Darrel James Van Buer, Los Angeles, CA (US);
General Motors LLC, Detroit, MI (US);
Abstract
A tone detector and associated method for use with EVRC-B and GSM vocoders to enable reliable detection of system connect tones over a wireless communication system. The tone detection method examines a number of sequential data frames of the signal received from the vocoder and determines that the tone is present if the spectral energy at frequencies around the tone is much higher than that at neighboring frequencies and if the calculated center frequency of the data frames is at or near the frequency of the tone.