Coding apparatus, decoding apparatus, coding-decoding apparatus for video signals, and optical disks conforming thereto
US5491514A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1994 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Jan 27, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/926
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.