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Vector quantizer

  • US 5,194,950 A
  • Filed: 02/27/1989
  • Issued: 03/16/1993
  • Est. Priority Date: 02/29/1988
  • Status: Expired due to Term
First Claim
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1. An input vector quantizer for encoding digital signals with high efficiency for transmission between transmitting and receiving sides and wherein a first codebook of fixed contents is included at each of said transmitting and receiving sides, said vector quantizer comprising one or more random access second codebooks having a learning function and being connected to the intermediate hierarchy of said first codebook, means for transmitting input vector and deciding information for matching of codebooks in the transmitting and receiving sides, and a means for executing, at a high speed, vector quantization through parallel use of said first codebook and said random access one or more second codebooks in a tree-searched minimum distortion process for sequentially storing said input vectors, as the new quantizing representative vectors into said one or more second codebooks when the minimum distortion in the tree-searched vector quantization is larger than threshold value, vectors previously stored in said one or more second codebooks.

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