Pitch quantization for distributed speech recognition

Details Pitch quantization for distributed speech recognition Pitch quantization for distributed speech recognition

2005-07-05

2005-07-05

Chawan, Vijay (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S208000, C704S209000, C704S230000, C704S214000

Reexamination Certificate

active

06915256

ABSTRACT:
A system, method and computer readable medium for quantizing pitch information of audio is disclosed. The method includes capturing audio representing a numbered frame of a plurality of numbered frames. The method further includes calculating a class of the frame, wherein a class is any one of a voiced or unvoiced class. If the frame is a voiced class, a pitch is calculated for the frame. If the frame is an even numbered frame and a voiced class, a codeword of a first length is calculated by absolutely quantizing the frame pitch. If the frame is an odd numbered frame and a voiced class and a reliable frame is available, a codeword of a second length is calculated by differentially quantizing the frame pitch. If there is no reliable frame available, a codeword of the second length is calculated by absolutely quantizing the frame pitch.

REFERENCES:
patent: 5081681 (1992-01-01), Hardwick et al.
patent: 5091944 (1992-02-01), Takahashi
patent: 6041297 (2000-03-01), Goldberg
patent: 6199037 (2001-03-01), Hardwick
patent: 6377916 (2002-04-01), Hardwick

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