Quantization control circuit

Details Quantization control circuit Quantization control circuit

1993-03-29

1995-02-14

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348 27, H04N 7133

Patent

active

053899733

ABSTRACT:
A quantization control circuit determines an optimum scaling factor for quantizing orthogonal transformation coefficient data that correspond to a predetermined time period of a digital video signal. A first scaling factor is determined from the orthogonal transformation coefficient data as a function of whether a bit rate determined by quantizing the orthogonal transformation coefficient data using an initial scaling factor is greater than a target bit rate. A corrected scaling factor is determined by calculating second scaling factors that are each derived from the first scaling factor. Error values are calculated from the second scaling factors using the orthogonal transformation coefficient data, and the second scaling factor that corresponds to the minimum error value is selected as the corrected scaling factor.

REFERENCES:
patent: 4901075 (1990-02-01), Vogel
patent: 5251029 (1993-10-01), Enari et al.

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