Receiver with an antenna switch, in which sensitivity and...

H - Electricity – 04 – B

Patent

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Details

H04B 1/18 (2006.01) H04B 1/10 (2006.01) H04B 1/44 (2006.01) H04B 1/46 (2006.01) H04B 1/56 (2006.01)

Patent

CA 2208513

In a receiver having an antenna switch (23) which is connected between a receiving section (24) and an antenna (21) for adjusting a received signal so that the received signal has, as a current signal level, one of a first and a second signal level, a switch control section (26) controls an operation of the antenna switch by the use of a current signal level of the received signal and a first and a second reference level which are determined in first and second determining sections (27, 28), respectively. In order to detect the current signal level, a signal level detection circuit (25) is connected to the antenna switch. It is preferable that a signal level holding circuit (34) is connected between the signal level detection circuit and the switch control section and is for holding the current signal level during a predetermined time duration.

Dans un récepteur ayant un commutateur d'antenne (23) qui est monté entre une section de réception (24) et une antenne (21) pour régler un signal reçu de sorte que le signal reçu ait, comme niveau d'intensité de signal, un d'un premier et d'un second niveaux de signal, une section de commande de commutateur (26) commande le fonctionnement du commutateur d'antenne au moyen d'un niveau d'intensité de signal du signal reçu et d'un premier et d'un second niveaux de référence qui sont établis dans une première et une seconde sections de détermination (27, 28), respectivement. De façon à détecter le niveau d'intensité du signal, un circuit de détection de niveau de signal (25) est connecté au commutateur d'antenne. Il est préférable de connecter un circuit de maintien de niveau de signal (34) entre le circuit de détection de niveau de signal et la section de commande de commutateur pour maintenir le niveau d'intensité du signal pendant une période prédéterminée.

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