Coder and decoder for a system designed to disseminate color television audio video signals
US4068259A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 1975 |
| Grant date | Jan 10, 1978 |
| Priority date | — |
| Expiry date | May 16, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/86
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A coder designed to receive color television audio video signals where a carrier wave is frequency modulated by the luminance signal and a sub-carrier wave is modulated by time multiplexed chrominance signal and audio signal; the carrier and the sub-carrier waves are linearly mixed and the resultant signal is converted into a multiplex wave formed by a train of length modulated pulses; the sub-carrier frequency is higher than the highest frequency of the luminance signal and the lowest instantaneous frequency of the carrier minus the highest frequency of the luminance signal is at least equal to the sub-carrier frequency; the multiplex signal may be transmitted and registered on a data carrier; and a decoder adapted for cooperating with the coder, for decoding the multiplex signal coming from the transmission channel or the read out data carrier and delivering the audio video signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.