Apparatus for detecting recorded data in a video tape recorder for audience rating purposes
US4792864A · kind A · utility
46Cited by
17References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1986 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Jun 27, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system is disclosed for detecting the recording data of a video tape recorder, which is enabled to detect data concerning the time and channel a program played back was recorded at and through, by adding both calendar data such as the date and time and channel data indicating a channel to be recorded in the recording operation of the video tape recorder and by extracting the above-specified data in the playback operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.