Method and apparatus for detecting video transmissions
US6297858A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1997 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Sep 23, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/44209
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for detecting validity of video transmissions in accordance with one of a plurality of channel identification plans is be accomplished by first detecting selection of a channel, wherein the channel corresponds to a particular video transmission. The signal strength of the video transmission is then tested over a frequency range relating to the channel. When the signal strength of the video transmission at a particular frequency exceeds a threshold, a video tuner utilizes the frequency to detect the video transmission. Upon detecting the video transmission, the video tuner outputs a base band signal of the video transmission to a video decoder. The video decoder converts the base band signal into a digitized video, which is checked to determine whether it includes a synchronization signal. If the digitized video includes a synchronization signal, the video transmission is deemed to be valid, i.e., it is in accordance with one of the plurality of channel identification plans. If, however, the digitized video does not include the synchronization signal or the signal strength at each of the frequencies of the frequency range did not exceed the threshold, the vide…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.