Vector-quantizing device having a capability of adaptive updatin

Details Vector-quantizing device having a capability of adaptive updatin Vector-quantizing device having a capability of adaptive updatin

1994-06-15

1996-06-04

MacDonald, Allen R.

395 23, G10L 900

Patent

active

055241700

ABSTRACT:
A vector-quantizing device comprises a first code book for storing a plurality of code vectors at respective addresses; a first addressing unit for selecting a code vector stored in the first code; a synthesis unit supplied with the code vector from the first code book for producing a synthetic signal that simulates an input signal; an evaluation unit supplied with the input signal and further with the synthetic signal from the synthesis means for evaluating a difference therebetween and searching for a code vector that minimizes the difference. There, the evaluation unit produces the first index data that specifies a code vector wherein the difference is minimized as a coded output. In addition, the vector-quantizing device includes a second code book for storing a plurality of code vectors at respective addresses; a second addressing unit for selecting a code vector stored in the second code book: and an update unit for counting the frequency of selection of the code vectors for each of the code vectors stored in the first code book. There, the update unit is for replacing a code vector in the first code book, when the frequency of use of the code vector is below a predetermined threshold, with a code vector in the second code book.

REFERENCES:
patent: 5007092 (1991-04-01), Galand et al.
patent: 5194950 (1993-03-01), Murakami et al.
patent: 8068723 (1991-11-01), Dixit et al.

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