Video cassette recorder adapter
US4633302A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 1985 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | Oct 1, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/163
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adapter for metering tv viewing in homes having video cassette recorders ("VCR's"). The adapter disables antenna (cable) input to the VCR except when in the record mode. Record mode is detected by a probe which detects the 70 MHz erase signal of the erase heads. When in record mode, antenna input to the VCR is enabled and a tv meter determines channel tuning. A bandpass filter on the VCR video output restricts the tv's ability to tube channels other than the VCR output. If the tv is tuned to the VCR output channel, the viewer is monitoring the program being recorded or watching a prerecorded tape. Otherwise, he is tuning through the normal antenna (cable) input and a meter determines the tv's channel tuning.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.