Signal processor (system) for reducing bandwidth and for multiplexing a plurality of signals onto a single communications link
US4589110A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1984 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | Sep 19, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/122
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The bandwidth required for a regularly occurring signal, such as a television signal, as received from a signal source can be substantially reduced by not transmitting each and every one of the horizontal scan lines. Rather, firstly, one or more selected lines may be transmitted and, secondly, instead of transmitting the remaining, unselected lines, a signal representing a predetermined arithmetic difference among predetermined ones of the scan lines may be transmitted. The bandwidth may be further reduced by a time expansion of the time interval of the selected line signal and by a time compression of the time interval of the differential signal. The bandwidth required for each regularly occurring signal as received from each of a plurality of N signal sources may be more efficiently used by time compression multiplexing the respective time expanded and time compressed signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.