Infra red communication systems

H - Electricity – 04 – B

Patent

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Details

H04B 10/10 (2006.01) H04R 3/00 (2006.01)

Patent

CA 2171902

A transmitter (10) and one or more receivers (12) are linked by infra red transmission via LED (14) and photodiode (16). In normal use, in-flight entertainment is modulated on left and right channels to give stereo sound on a user's earphones (28a, 28b). Transmitter public address signal on one channel and a code signal on the other channel. At the receiver (12), the code is detected (at 36) to operate receiver switching means (38) which disable the user's volume controls (30), thus ensuring that the public address message is heard at full volume. Also described are improved infrared signal receiving arrangements mitigating the effects of ambient light interference.

Émetteur (10) et un ou plusieurs récepteurs (12) liés par rayons infrarouges au moyen de DEL (14) et photodiodes (16). Normalement, le système de divertissement de bord est modulé sur des voies gauche et droite pour produire un effet stéréophonique sur les écouteurs d'un utilisateur (28a, 28b). Il émet un signal d'annonce sur un canal et un signal de code sur l'autre. Le récepteur (12) détecte le code (au point 36) afin de mettre en marche un dispositif de commutation (38) qui rend inopérantes les commandes de volume de l'utilisateur (30) et permet ainsi l'audition de l'annonce à plein volume. On présente également des moyens améliorés de réception des signaux infrarouges, qui atténuent les effets d'interférences lumineuses ambiantes.

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