Method and apparatus for transmitting and receiving additional information in a television signal
US4079419A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 1975 |
| Grant date | Mar 14, 1978 |
| Priority date | — |
| Expiry date | Oct 29, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Identification of a program being transmitted is encoded digitally on a sub-carrier modulated on the sound carrier of a television signal with each elementary code group occupying a television field interval, the information being transmitted in cycles of several television fields. The sub-carrier frequency is chosen so as to minimize interference with the picture or sound. A receiver is programmed to be in a standby state during a period during which the coded identification of desired programs are compared with detected program identifications. The receiver is shifted from channel to channel so long as the program desired for the particular time is not found. When it is found, the display circuits are turned on and the channel-shifting device is disabled, so long as the identification of the desired program continues to be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.