Coding apparatus, decoding apparatus, coding-decoding apparatus

Details Coding apparatus, decoding apparatus, coding-decoding apparatus Coding apparatus, decoding apparatus, coding-decoding apparatus

1994-01-27

1996-02-13

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348390, H04N 726

Patent

active

054915147

ABSTRACT:
A coding and decoding apparatus is used to code and decode video signals. Input video signals are enhanced by an emphasis circuit having a nonlinear characteristic increasing an enhancement degree as amplitude of the input video signal decreases. The enhanced video signal, outputted from the emphasis circuit, is compression coded in an encoder and a code stream, representing a compression coded video signal, is outputted from the encoder. The code stream is transmitted to a decoder and the decoder decodes the code stream, outputting a decoded video signal. The decoded video signal is fed to a de-emphasis circuit having a nonlinear characteristic increasing a suppression degree as amplitude of the input signal decreases. As a result, low noise high quality video signals is reproduced from the de-emphasis circuit.

REFERENCES:
patent: 4268861 (1981-05-01), Schreiber
patent: 5089917 (1992-02-01), Kanota

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