Digital signal recording method and apparatus and digital signal reproduction method and apparatus
US6115341A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1998 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Feb 9, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/85
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention enables to record and reproduce a digital signal in a high quality picture mode and in a long time mode with different compression rations on a single disc-shaped recording medium. An output from a tuner 11 is supplied to a sound/data isolation circuit 12 where a video signal, an audio signal, and an accompanying data are isolated. The video signal is supplied via an A/D conversion circuit 14, a Y/C isolation circuit 15, a color demodulation circuit 16, a pre-filter 18, and a resampling circuit 19 to a compression circuit 20 where the video signal is compressed. The audio signal is supplied via an A/D conversion circuit 34, a pre-filter 38, and a resampling circuit 39 to a compression circuit 40 where the audio signal is compressed. Here, the compression ratio is switched by a control signal which specifies the high quality picture/long time mode. The compressed video signal, the compressed audio signal, and the accompanying data is combined into a serial data by a multiplex circuit 41 and via a FIFO memory 42 recorded on a disc-shaped recording medium 100. During a reproduction, the video signal and the audio signal are outputted according to the aforemention…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.