Audience rating measuring system
US4622583A · kind A · utility
77Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1984 |
| Grant date | Nov 11, 1986 |
| Priority date | — |
| Expiry date | Dec 17, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system which detects the operation of a video tape recorder to obtain data related to the operation of the video tape recorder. The system is also capable of determining the dubbing condition of the video tape recorder over the recording of an ordinary broadcast. The system further determines the receiving channel of the video tape recorder or the television set by directly comparing video signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.