Process for transmitting digital data, in particular sound data, in a TV channel
US5325127A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 17, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Jul 17, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method of transmitting digitally coded information in a television sound channel, the digitally coded information is inserted on an existing frequency-modulated RF sound carrier as a channel-coded signal above the television audio-frequency base spectrum in the base band. The modulation amplitude is selected so that disturbances during reproduction of the television sound are excluded in the receiver. The spectrum of the channel-coded signal is evenly distributed over the available frequency range using a pseudo-signal during modulation intervals. The clock frequency of the channel-coded signal is coupled with the line frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.