Method and apparatus for constant data rate output of encoders

Details Method and apparatus for constant data rate output of encoders Method and apparatus for constant data rate output of encoders

1996-09-03

1998-09-22

Britton, Howard

Television

Bandwidth reduction system

Data rate reduction

340 19, 340408, H04N 750

Patent

active

058122001

ABSTRACT:
An apparatus for encoding data blocks and methods of operating the same result in an encoder that provides constant data rate outputs. The encoder comprises DCT (discrete cosine transformer) resources having a truncate controller configured to receive a truncate signal to truncate the data blocks to provide reduced data blocks. Quantizing resources is coupled to the DCT resources to quantize the reduced data blocks to provide quantized data blocks. Inverse quantizing resources is coupled to the quantizing resources to inverse quantize the quantized data blocks to provide inverse quantized data blocks. Frame reconstruction resources is coupled to the inverse quantizing resources to reconstruct previous compressed frames. Motion estimation resources is coupled to the frame reconstruction resources to provide predicted data blocks. Subtraction resources is coupled to the DCT resources and the motion estimation resources to subtract the data blocks and the predicted data blocks. An output data buffer having a data rate controller is coupled to the quantizing resources and the inverse quantizing resources to provide the truncate controller the truncate signal in response to excessive output image rates so that a constant output image rate is maintained.

REFERENCES:
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patent: 5321440 (1994-06-01), Yanagihara
patent: 5337087 (1994-08-01), Mishima
patent: 5541640 (1996-07-01), Larson
patent: 5583657 (1996-12-01), Jeong
patent: 5666161 (1997-09-01), Kohiyama

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