Compression and coding device for video signals
First Claim
1. A coding device, which transmits digital signals consisting of sampled data obtained by sampling and quantizing an analogue video signal with a number of quantization bits n after having compressed and coded the digital signals, comprising:
- group finishing means for forming one group for every N sampled data, N being an integer greater than two;
reference sampled data setting means for setting one of the N sampled data as a reference sampled data for each of the groups formed by said group forming means;
difference calculating means for calculating the difference between at least one of the remaining sampled data in each of said groups and the reference sampled data;
compressing and coding means for coding the difference obtained by said difference calculating means with a number of bits smaller in number than the number of quantization bits n; and
a data selector for outputting at least the reference sampled data from said reference sampled data setting means and coded differential data from said compressing and coding means as time sequential digital data.
1 Assignment
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Accused Products
Abstract
A coding device in which N digital signals (time-sequential sampled data), obtained by sampling and quantizing analog video signals, are brought together in one group (N being an integer greater than two) and coded. Among these N sampled data, at least one of them serving as a reference is coded with a number of quantization bits n, which is so great that errors due to the quantization can be neglected, and for the other sampled data the difference between the reference sampled data and each of the others is compressed and coded with a number of bits, which is smaller than n. In this way, even if a coding error is produced; effects thereof are restricted within the gorup where it is produced they are not exerted on the other groups, and thus error propagation does not occur.
133 Citations
36 Claims
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1. A coding device, which transmits digital signals consisting of sampled data obtained by sampling and quantizing an analogue video signal with a number of quantization bits n after having compressed and coded the digital signals, comprising:
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group finishing means for forming one group for every N sampled data, N being an integer greater than two; reference sampled data setting means for setting one of the N sampled data as a reference sampled data for each of the groups formed by said group forming means; difference calculating means for calculating the difference between at least one of the remaining sampled data in each of said groups and the reference sampled data; compressing and coding means for coding the difference obtained by said difference calculating means with a number of bits smaller in number than the number of quantization bits n; and a data selector for outputting at least the reference sampled data from said reference sampled data setting means and coded differential data from said compressing and coding means as time sequential digital data. - View Dependent Claims (2, 3, 4, 17, 21, 22, 23)
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5. A coding device, which transmits digital signals consisting of sampled data obtained by sampling and quantizing an analogue video signal with a number of quantization bits n after having compressed and coded the digital signals, comprising:
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group forming means for forming one group for every N sampled data, N being an integer greater than two; reference sampled data setting means for setting one of the N sampled data as a reference sampled data for each of the groups formed by said group forming means; predicted value forming means for forming a predicted value for at least one of the remaining sampled data in each of said groups; difference calculating means for calculating the difference between the predicted data coming from said predicted value forming means and the at least one of the remaining sampled data; compressing and coding means for coding the difference obtained by said difference calculating means with a number of bits smaller in number than the number of quantization bits n; and a data selector for outputting at least the reference sampled data from said reference sampled data setting means and coded differential data from said compressing and coding means as time sequential digital data. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification