Multi-modulation remote control communication system

G - Physics – 08 – C

Patent

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Details

G08C 17/02 (2006.01) B60R 16/02 (2006.01) H03C 7/00 (2006.01) H04L 27/32 (2006.01)

Patent

CA 2505890

An AM/FM modulation scheme is presented for optimizing communications between a remote control device held by a user and a receiving unit installed in a vehicle. Historically, these systems communicated with amplitude modulated signals having good range but poor immunity to ambient random radio frequency noise. Frequency modulated systems provide improved immunity to noise however at the expense of range. The object of this invention is to use two or more modulation modes to combine their advantages. A scheme has been devised whereby circuitry capable of alternately operating in at least two modes is used. The same information is therefore transmitted using two or more modulation techniques in succession. The receiving unit also has circuitry and has listening cycles ensuring eventual synchronization with the transmitting unit. If one mode fails due to distance or ambient noise, the other can then attempt to establish a link.

L'invention concerne un schéma de modulation AM/FM pour optimiser la communication entre une télécommande maintenue par l'utilisateur et un organe récepteur installé dans un véhicule. D'habitude, les systèmes communiqués au moyen de signaux modulés en amplitude ont une bonne gamme, mais une faible immunité au bruit radioélectrique ambient aléatoire. Les systèmes à modulation de fréquence offrent une meilleure immunité au bruit, mais au détriment de la gamme. La présente invention a pour objet d'utiliser deux ou plusieurs modes de modulation pour combiner leurs avantages. On a conçu un schéma dans lequel on utilise une circuiterie capable de fonctionner alternativement dans au moins deux modes. La même information est donc transmise au moyen de deux ou plusieurs techniques de modulation de façon successive. L'organe récepteur comporte également une circuiterie et des cycles d'écoute qui assurent une synchronisation éventuelle avec l'unité de transmission. Si un mode échoue à cause de la distance ou du bruit ambiant, l'autre peut alors tenter d'établir une connexion.

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