System comprising a preliminary processing device controlled in accordance with an amount of information stored in a buffer
US4517596A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1982 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Sep 29, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/50
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an encoding system comprising a buffer circuit for successively storing variable length codes and for producing the stored codes at a predetermined rate as transmission codes, a controller produces a control signal which stepwise specifies a variable amount of the stored codes. Responsive to the control signal, a preliminary processing circuit preliminarily processes the digital video signals into preliminarily processed signals which are dependent on the amounts and which are predictively encoded in accordance with an encoding rule by a non-recursive predictive encoder into predictive error signals with information of the preliminarily processed signals preserved. For use in the buffer circuit, a variable length encoder controlled by the control signal further encodes the predictive error signals into the variable length codes of code lengths related to the amounts. The processing circuit may comprise at least one of a quantizer, a thinning circuit, and a band compression circuit. A decoding system decodes the transmission codes in accordance with a decoding rule reversible to the encoding rule to produce reproductions of the preliminarily processed signals. A combination of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.