Audience monitoring system
US4779198A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1988 |
| Grant date | Oct 18, 1988 |
| Priority date | — |
| Expiry date | Jan 26, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H60/33
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Each doorway or passageway between rooms in which a device may be located is fitted with another device which detects motion and the direction of the motion through the passage. Each room is equipped with a signal emitter that is controlled by the motion detector at the room's passage. The signal emitted by the signal emitter is received by a monitor which monitors the status of the device which happens to be located in that room. The emitted signal informs the monitor when there has been motion into the room (audience increase) or when there has been motion out of the room (audience decrease). Motion between rooms will result in a decrease signal being sent by the signal emitter in one room and an increase signal being sent by the signal emitter in the other room. If no device and monitor are located in a room, the increase or decrease signal is ignored by the audience monitoring system. If a monitor is located in the room, however, the increase or decrease signal received by it from the signal emitter will cause the monitor to issue an immediate prompt, to remind the persons in the room to push the keys of an inputting device to report the identity of the individuals who just ent…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.