Technique for the transmission of video and audio signals over a digital transmission system
US4544950A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1984 |
| Grant date | Oct 1, 1985 |
| Priority date | — |
| Expiry date | Jan 3, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a technique for transmitting both a video and a plurality of audio signals within a predetermined signal format which is compatible with a known signal format not normally used for television transmission. More particularly, the video signal is sampled at a first multiple of the video subcarrier frequency. The digitized video signal and associated video mode status bits are then multiplexed with the plurality of digitized audio signals into an N-bit frame format using a second multiple of the video subcarrier frequency which is less than the line frequency of the known signal format. The N-bit frames are then sectioned into Y-bit subframes and multiplexed with auxiliary and monitoring bit information comprising, for example, frame location bits for the Y-bit subframes using a third multiple of the video subcarrier frequency to generate a system signal format which is compatible with the known signal format. At a receiving end the system signal format is demultiplexed in a reverse manner to the multiplexing sequence at the transmitter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.