Patent ID: 8219391
Filing Date: 2012-07-10
Classification: G10L

Abstract:
1. A method for processing a signal, comprising the steps of: receiving an input sound signal including speech and environmental noise; temporally parsing the input sound signal into input frame sequences of at least three input frames, wherein an input frame represents a segment of a waveform of the input sound signal; providing a speech codebook including a plurality of entries corresponding to speech spectral trajectories of reference frame sequences that include at least three reference frames, wherein a reference frame represents a segment of a waveform of a reference sound signal, wherein the reference frame sequence corresponding to the entries are derived from allowable sequences of at least three reference frames, and wherein the speech codebook substantially lacks entries corresponding to (1) reference frame sequences that include a single unvoiced frame between a pair of voiced frames, and (2) reference frame sequences that include a single voiced frame between a pair of unvoiced frames; identifying phones within the speech based on a comparison of an input frame sequence with a plurality of the speech spectral trajectories of reference frame sequences; and encoding the phones.