JPH01108637U

JPH01108637U -

Info

Publication number: JPH01108637U
Application number: JP315888U
Authority: JP
Priority date: 1988-01-14
Filing date: 1988-01-14
Publication date: 1989-07-24

Description

[Brief explanation of drawings]

第１図は本考案の一実施例のダイバーシチ受信
機１のブロツク図、第２図は停止レベル判定部１
７および時定数回路１８の一構成例を示す電気回
路図、第３図は停止レベル判定部１７および時定
数回路１８の他の構成例を示す電気回路図、第４
図はアンテナ入力に対する音響出力レベルの変化
を示すグラフ、第５図はアンテナ入力レベルに対
するミユート信号レベルを示すグラフ、第６図は
チユーナ入力に対するＳ信号レベルとミユート信
号レベルとの変化を示すグラフ、第７図はダイバ
ーシチ受信機１における離調状態に対するミユー
ト処理を説明するグラフ、第８図はチユーナ入力
とミユート信号レベルおよびＳレベルとの関係を
示すグラフである。１……ダイバーシチ受信機、２……ロツドアン
テナ、３……ガラスアンテナ、４……アンテナ切
換部、６……検波部、１２……離調検出部、１３
……電界強度検出部、１７……停止レベル判定部
、１８……時定数回路、１９……フリツプフロツ
プ回路。 FIG. 1 is a block diagram of a diversity receiver 1 according to an embodiment of the present invention, and FIG. 2 is a stop level determination unit 1.
7 and the time constant circuit 18; FIG. 3 is an electric circuit diagram showing another example of the structure of the stop level determination unit 17 and the time constant circuit 18;
FIG. 5 is a graph showing changes in acoustic output level with respect to antenna input; FIG. 5 is a graph showing changes in mute signal level with respect to antenna input level; FIG. 6 is a graph showing changes in S signal level and mute signal level with respect to tuner input; FIG. 7 is a graph illustrating the mute processing for the detuned state in the diversity receiver 1, and FIG. 8 is a graph showing the relationship between the tuner input, the mute signal level, and the S level. DESCRIPTION OF SYMBOLS 1... Diversity receiver, 2... Rod antenna, 3... Glass antenna, 4... Antenna switching section, 6... Detection section, 12... Detuning detection section, 13
. . . Field strength detection section, 17 . . . Stop level judgment section, 18 . . . Time constant circuit, 19 . . . Flip-flop circuit.

Claims

[Claims for Utility Model Registration] In a diversity receiver that detects electric field strength and detuning state and commonly applies these detection outputs to antenna switching means to switch a plurality of antennas so as to increase receiving sensitivity, A diversity receiver characterized in that antenna switching is stopped during a period when a detection output is within a predetermined level range.