Meter for passively logging the presence and identity of TV viewers
US4626904A · kind A · utility
169Cited by
10References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1985 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Nov 12, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2420/07
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A meter for passively logging the presence of TV viewers including circuitry for disabling the audio of a TV set, a transmitter for wirelessly transmitting the audio to a plurality of headphones, a circuit responsive to the headphones presence upon the head of a viewer for transmitting a headphone ID signal to a monitor, a receiver in the monitor for logging the fact that particular headphones are activated, and a time of day clock for logging the period of time particular headphones are activated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.