H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 3/42 (2006.01) G10L 9/04 (1995.01) G10L 9/08 (1995.01)
Patent
CA 2218605
A method and apparatus for compressing and decompressing an audio signal is provided. The apparatus comprises an input for receiving an audio signal derived from a spoken utterance, the audio signal being contained into a plurality of successive data frames. A data frame holding a certain portion the audio signal is processed to generate a feature vector including a plurality of discrete elements characterizing at least in part the portion of the audio signal encompassed by the frame, the elements being organized in a certain sequence. The apparatus makes use of a compressor unit having a grouping processor for grouping elements of the feature vector into a plurality of sub-vectors on the basis of a certain grouping scheme, at least one of the sub-vectors including a plurality of elements from the feature vector, the plurality of elements being out of sequence relative to the certain sequence. The plurality of sub-vectors are then quantized by applying a vector quantization method.
Nortel Networks Limited
Northern Telecom Limited
Smart & Biggar
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