Television – Bandwidth reduction system – Data rate reduction
Patent
1995-03-14
1997-01-28
Au, Amelia
Television
Bandwidth reduction system
Data rate reduction
348419, H04N 736
Patent
active
055982131
ABSTRACT:
In an encoder having a data formatter, a DCT circuit, a transmission rate controlling apparatus, a quantizer, a variable-length coder and an encoder buffer, for compressing a moving picture signal, the transmission rate controlling apparatus includes a segment complexity estimator for receiving outputs of the quantizer and variable-length coder and estimating the complexity of a segment of a current frame relative to a previous frame, a rate control adjustment coefficient calculator for receiving the output of the segment complexity estimator and calculating a rate control adjustment coefficient, a reference quantization coefficient calculator for receiving the rate control adjustment coefficient and the output of the encoder buffer and calculating a reference quantization coefficient, and an activity calculator for receiving the output of the data formatter, calculating activity by a macroblock unit, performing an operation on the calculated activity using the output of the reference quantization coefficient calculator and outputting a quantization coefficient.
REFERENCES:
patent: 5396567 (1995-03-01), Jass
patent: 5404174 (1995-03-01), Sugahara
patent: 5526052 (1996-06-01), Ar
Chung Tae-yun
Jung Gyu-hwan
Au Amelia
Samsung Electronics Co,. Ltd.
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