Audience rating measuring system for television and video tape recorder
US4574304A · kind A · utility
114Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1984 |
| Grant date | Mar 4, 1986 |
| Priority date | — |
| Expiry date | Apr 20, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H60/32
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to an audience rating measuring system for a television and a video tape recorder and provides an audience rating measuring system which can give accurate audience data under various conditions, such as when a television and a video tape recorder are used in combination, that can not be measured by the conventional audience rating measuring systems in general use. The audience rating measuring system of the invention comprises means for video tape recorder channel discrimination, video tape recorder operation mode discrimination, and television channel discrimination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.