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:
Oct. 13, 1998
Filed:
Jan. 31, 1995
Matthew Whiting Taylor, Gurnee, IL (US);
Ralph Douglas Smallwood, Sleepy Hollow, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A speech presence detector (101) includes a circuit input (105) to couple to a source of input signals. A control signal generator (113) generates control signals. A sampling circuit (112) samples the input signals as a function of the control signal. A processor (116, 616, or 916) is coupled to the sampling circuit to receive the signal samples. The processor is responsive to the sampled signals to identify a background noise threshold and detect the presence of speech. According to one embodiment, the method and apparatus employ a random control signal. According to another embodiment, the average frequency of the control signal is below the Nyquist rate. According to another embodiment, the processor is responsive to the received signal to count the number of samples within a predetermined amplitude range and identifies a background noise threshold from the number of samples which are in the predetermined range.