Patent ID: 8090577
Filing Date: 2012-01-03
Classification: G10L

Abstract:
1. A method for processing an acoustic signal, said method comprising performing each of the following acts within a device that is configured to process acoustic signals: calculating an energy of a first frame of the acoustic signal in each of a first frequency band and a second frequency band that is higher than the first frequency band; calculating an energy of a second frame of the acoustic signal in each of the first and second frequency bands; based on the calculated energies of said first frame in said first and second frequency bands, classifying the first frame as speech, including selecting a first coding rate for said first frame as an initial rate decision for said first frame; based on the calculated energies of said second frame in said first and second frequency bands, classifying the second frame as speech, including selecting a second coding rate for said second frame as an initial rate decision for said second frame; calculating an energy of said first frame in a third frequency band that is higher than said second frequency band; calculating an energy of said second frame in a fourth frequency band that includes at least the first frequency band; based on the calculated energy of said first frame in said third frequency band, deciding to alter the initial rate decision for said first frame; based on the calculated energy of said second frame in said fourth frequency band, deciding to alter the initial rate decision for said second frame; in response to said deciding to alter the initial rate decision for said first frame, selecting a third coding rate for said first frame that is different than said first coding rate; and in response to said deciding to alter the initial rate decision for said second frame, selecting a fourth coding rate for said second frame that is different than said second coding rate, wherein said deciding to alter the initial rate decision for said second frame is not based on a calculated energy of said second frame in said third frequency band.