Vector search method

Details Vector search method Vector search method

1998-03-26

2008-12-09

Hudspeth, David R. (Department: 2741)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S230000

Reexamination Certificate

active

07464030

ABSTRACT:
Each of the M basic vectors in a noise code book260is multiplied by a factor ±1 in a sign adder270and combined in an adder280to create 2Mnoise signed vectors. The characteristic of the binary Gray code is utilized as follows. A change ΔGuobtained between a noise signed vector based on a signed word i of the binary Gray code and a noise sign vector based on a sign word u adjacent to the sign word i and different from the sign word i only in a predetermined bit position v is used in such a manner that a sign word u′ which is next to reverse the bit position v on the Gray code sequence can express a change ΔGu′from the noise signed vector by utilizing the fact that the sign word u′ differs from the sign word u only in one bit position w excluding the bit position V. Thus, calculation is simplified, increasing the vector search speed.

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Chan et al. (Efficient codebook search procedure for vector-sum excited liner predective coding of speech); Electronics Letters, vol. 30, No. 22, pp. 1830-1831, Oct. 1994.
I. Gerson et al.,Vector Sum Excited Linear Prediction, Advances in Speech Coding, pp. 69-79 (Jan. 1, 1991).

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