Quantization of input vectors with and without rearrangement...

Details Quantization of input vectors with and without rearrangement... Quantization of input vectors with and without rearrangement...

H - Electricity

03

M

H03M 7/30 (2006.01) G06T 9/00 (2006.01) G10L 19/12 (2006.01) G10L 3/00 (1995.01) G10L 9/14 (1995.01)

Patent

CA 2147394

For quantizing input vectors into output codes with reference to quantization vectors with reduction of a memory capacity, a vector quantizer device comprises a rearranging unit (21, 23) between a codebook circuit (17) preliminarily loaded, in accordance with codebook indexes, with code vectors selected from the quantization vectors to produce at least one candidate vector in response to a current index and a distance calculator (15) for calculating, between each input vector and comparison vectors given by the candidate vector, distance values for supply to an evaluation circuit (19) for producing a selected index indicative of one of the comparison vectors that minimizes the distance values and for successively producing the output codes with the selected index used as each output code without or with addition of a rearrangement index. When the rearrangement index is and is not added, the rearranging circuit produces the candidate vector in each comparison vector as an unchanged vector and as a rearranged vector in which vector elements of the candidate vector are rearranged, respectively. The rearranging unit may rearrange the candidate vector in compliance with a single predetermined rule or with rules preliminarily stored in a rearrangement table circuit (23) in accordance with table indexes with one of the rules delivered to a rearranging circuit (21) in response to the rearrangement index.

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