Title:
【発明の名称】符号化装置
Document Type and Number:
Japanese Patent JPH0793584
Kind Code:
B2
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.
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Inventors:
Tomio Okamura
Keizo Nishimura
Higuchi Shigemitsu
Takashi Furihata
Keizo Nishimura
Higuchi Shigemitsu
Takashi Furihata
Application Number:
JP23869787A
Publication Date:
October 09, 1995
Filing Date:
September 25, 1987
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
H03M7/36; H04N5/926; H04N7/26; H04N11/04; (IPC1-7): H03M7/36; H04N7/32; H04N11/04
Domestic Patent References:
| JP59223033A | ||||
| JP59223034A | ||||
| JP61208924A | ||||
| JP6342988B2 | ||||
| JP366854B2 | ||||
| JP528034B2 | ||||
| JP61903B2 | ||||
| JP6161733B2 |
Other References:
【文献】米国特許4907081(US,A)
Attorney, Agent or Firm:
Namiki Akio
Next Patent: IMAGE SHADOWING METHOD