Patent ID: 8612216
Filing Date: 2013-12-17
Classification: G10L

Abstract:
1. A method for forming an audio signal, comprising: receiving a data stream of audio data to create a synthetic audio signal, dividing the received audio data into a first subband of audio data and a second subband of audio data, the first subband of audio data being a first subband of the received audio data within a first frequency range, the second subband of audio data being a second subband of the received audio data within a second frequency range that is a higher range than the first frequency range, decoding the first subband of the audio data into a first audio data signal via a decoder and evaluating parameters of the first subband of audio data, the evaluated parameters comprising an atonal mixing parameter, a tonal mixing parameter, and a fundamental period parameter for each time frame of the first subband of data; creating a synthetic excitation signal based upon the atonal mixing parameter, the tonal mixing parameter, and the fundamental period parameter for each time frame of the second subband of audio data by a process comprising: sending the synthetic excitation signal to an audio synthesis filter to excite the audio synthesis filter; the audio synthesis filter excited via the excitation signal filtering the second subband of the audio data to generate a second audio data signal within the second frequency range for each time frame of the second subband of audio data; and mixing the first and second audio data signals to create the synthetic audio signal in a third frequency range, the third frequency range encompassing frequencies within the first and second frequency ranges.