Apparatus and method for remote convenience message transmission and control utilizing frequency diversity
US6265988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1998 |
| Grant date | Jul 24, 2001 |
| Priority date | — |
| Expiry date | Apr 6, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2209/61
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A remote convenience system (10) includes a portable transmitter unit (14) and a receiver unit (18), and by a method, permits remote control of performance of a function, via a signal (16). Preferably, the system (10) is a remote convenience system for a vehicle (12). The transmitter unit (14) has a microcomputer (90) that provides a message that contains a function request. First and second signals are transmitted from the transmitter unit (14). Each signal is provided by a transmitter portion (70) at a different frequency and conveys the complete message. The receiver unit (18) has a detector (e.g., 190) tuned to receive the signal (16) for both the first and second frequencies, and can discern the complete message provided via both frequencies or either frequency. Thus, if the transmitter unit (14) is in a frequency dependent "dead spot", communication is not prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.