Apparatus and methodology for coding digital video signals to im

Details Apparatus and methodology for coding digital video signals to im Apparatus and methodology for coding digital video signals to im

1994-08-05

1996-09-24

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348415, 348411, 348414, 348412, H04N 712

Patent

active

055595588

ABSTRACT:
A method of coding a digital video signal and apparatus therefor receives the digital video signal and executes a first compression step in which a frame of the signal is coded using a correlation within the frame. A second compression step is then executed in which a frame of the signal is coded using a correlation between the frame and another frame of the signal. Selection processing is then carried out by which the output of one of the first and second compression steps is selected as an input frame of the video signal such that the output of the second compression step is utilized for at least two continuous frames of the video signal and the output of the first compression step is utilized for a single frame between two continuous frames of the video signal. In each of the first and second compression steps, one frame of the video signal is divided into a predetermined number of data sets, each of which includes a synchronizing code for detecting a start portion of the data set and each of which can be decoded independently of other data sets. The predetermined number of data sets derived at the first coding step being larger than the predetermined number of the data sets derived at the second coding step.

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