Data transmission system
US4761644A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 1986 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Jun 3, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00793
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A control over data transmission and reception which is utilized in remotely controlled electronic vehicle lock system. During the standby mode, the power dissipation in a receiver is reduced to a required minimum level, while when a radio wave is received, the supply of power is automatically switched to enable the receiver for its proper functioning. A transmitter delivers a carrier for a given time interval in response to a switch being turned on, and then transmits a modulated wave which includes a switch code and an identification code. By utilizing a frequency modulation, the presence or absence of a wave being received is determined in accordance with noise level which appears at the demolulator output. When the presence of a wave being received is determined, the supply of power is switched, and is then maintained for a given time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.