Memory based vector quantization

Details Memory based vector quantization Memory based vector quantization

1987-09-04

1994-04-05

Cangialosi, Salvatore

Coded data generation or conversion

Digital code to digital code converters

Coding by table look-up techniques

341 87, H03M 730

Patent

active

053009312

ABSTRACT:
Apparatus is provided for performing two stages of high-speed compression of vector data inputs. Two input channels of vector data are compressed and encoded through a vector quantizer encoder to provide a first stage of data compression. The output of the first encoder is further decoded then compressed and encoded in a novel high-speed computing mapping means which may be implemented in the form of a look-up table. Vector quantized encoded output is double the previous data compression of a single stage. The second stage of data compression causes very little degradation of the data from the first stage of data compression.

REFERENCES:
patent: 4490786 (1984-12-01), Nakatani
patent: 4606069 (1986-08-01), Johnsen
patent: 4626829 (1986-12-01), Hauck
patent: 4710812 (1987-12-01), Murakami et al.
patent: 4727354 (1988-02-01), Lindsay
patent: 4971407 (1990-11-01), Hoffman
patent: 4988998 (1991-01-01), O'Brien
"Vector Quantization" by Robert M. Gray; IEEE Acoustical Speech and Signal Processing (ASSP) Apr. 1984@ pp. 4-29.

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