JPS606357U

JPS606357U - public address receiver

Info

Publication number: JPS606357U
Application number: JP1983097880U
Authority: JP
Inventors: 細山田　純幸; 松尾　順二
Original assignee: 株式会社東芝
Priority date: 1983-06-27
Filing date: 1983-06-27
Publication date: 1985-01-17

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の拡声受信機のフ狛ツク図、第２図は第１
図の動作のタイミングチャート、第３図は第１図のノツ
チフィルタの周波数特性を示す図、第４図は本考案の一
実施例のブロック図、第５図は第４図の要部ブロック図
、第６図は第４図の動作のタイシングチヤード、第７図
は本考案の他の実施例のブロック図である。１・・・・・・無線受信回路、２・・・・・・ノツチフ
ィルタ、３・・・・・・ゲート回路、４・・・・・・電
力増幅回路、５・・・・・・スピーカ、６・・・・・・
選択呼出応答回路、７・・・・・・終話信号検出回路、
８・・・・・・遅延回路、９・・・・・・Ａ／Ｄコンバ
ータ、１０・・・・・・シフトレジスタ、１１・・・・
・・Ｄ／Ａコンバータ、１２・・・・・・信号通過不通
過制御回路。Figure 1 is a diagram of a conventional loudspeaker receiver, and Figure 2 is a diagram of a conventional loudspeaker receiver.
Fig. 3 is a diagram showing the frequency characteristics of the notch filter shown in Fig. 1, Fig. 4 is a block diagram of an embodiment of the present invention, and Fig. 5 is a block diagram of the main parts of Fig. 4. , FIG. 6 is a timing diagram of the operation of FIG. 4, and FIG. 7 is a block diagram of another embodiment of the present invention. 1... Radio receiving circuit, 2... Notch filter, 3... Gate circuit, 4... Power amplifier circuit, 5... Speaker , 6...
Selective call response circuit, 7...End call signal detection circuit,
8...Delay circuit, 9...A/D converter, 10...Shift register, 11...
...D/A converter, 12...Signal passage/non-passage control circuit.

Claims

[Scope of utility model registration request]

(1) A radio reception circuit that receives, demodulates and outputs a radio signal sent out by a transmitter, a delay circuit that delays and outputs the signal output by the radio reception circuit, and a pre-assignment from the output of the radio reception circuit. a selective call response circuit that detects a selective call signal that has been received; a call end signal detection circuit that detects a call end signal from the output of the radio receiving circuit; A signal passing/not passing control circuit that allows passage by a signal outputted when detected and not passing by a signal outputted when the call ending signal detection circuit detects the ending signal; and an output of the signal passing/not passing control circuit. A public address receiver consisting of a speaker and a speaker that converts the sound into audio.

(2) The signal passing/not passing control circuit is a power amplifier circuit, and the gain of the power amplifier circuit is set to a predetermined amount by the output of the selective call response circuit, and the gain of the power amplifier circuit is set to a predetermined amount by the output of the call termination signal detection circuit. A loudspeaker receiver according to claim 1 of the utility model registration claim, characterized in that:

(3) The signal passing/not passing control circuit is composed of a power amplifying circuit and a gate circuit connected to the power amplifying circuit, and opens the gate circuit by the output of the selective call response circuit, and opens the gate circuit by the output of the end-of-call signal detecting circuit. A public address receiver according to claim 1, characterized in that the circuit is closed.