Pitch cycle search range setting apparatus and pitch cycle...

Details Pitch cycle search range setting apparatus and pitch cycle... Pitch cycle search range setting apparatus and pitch cycle...

2007-02-13

2007-02-13

Abebe, Daniel (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S219000, C704S222000

Reexamination Certificate

active

10380626

ABSTRACT:
An Adaptive Sound Source Vector Generator (ASSVG)103sets preceding and succeeding pitch cycles centered on an integral-accuracy pitch cycle T0selected in the previous subframe as a range for searching for a fractional-accuracy pitch frequency, and extracts an adaptive sound source vector P(T-frac) that has fractional-accuracy pitch cycle T-frac within this range from an Adaptive Code Book (ACB)102. A Last Sub Frame Integral Pitch Cycle Storage (LSFIPCS)108stores integral component T0of the optimal pitch cycle selected by a Distortion Comparator (DC)107, and when a pitch cycle of the next subframe is searched for, outputs this optimal pitch cycle integral component T0to the Adaptive Sound Source Vector Generator (ASSVG)103. An Optimal Pitch Cycle Accuracy Judge Section (OPCAJS)109judges whether the optimal pitch cycle is of integral accuracy or fractional accuracy. A Comparison Judge Section (CJS)110restricts the number of times fractional-accuracy pitch information is selected in an optimal pitch cycle.

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