JPS5917653U

JPS5917653U - receiving device

Info

Publication number: JPS5917653U
Application number: JP11056382U
Authority: JP
Inventors: 正和藤島
Original assignee: ヤマハ株式会社
Priority date: 1982-07-21
Filing date: 1982-07-21
Publication date: 1984-02-02

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図は従来のスーパヘテロゲイン式受信機の概略構成
を示す回路図、第２図は従来の受信機における高周波増
幅段の同調周波数と、希望受信局との関係を示すグラフ
、第３図は第２図のグラフにおいて、高周波増幅段にお
ける減衰特性を示すグラフ、第４図は本考案に係わる受
信装置の一実施例を示す回路図、第５図は本考案の受信
装置の妨害除去原理を示すグラフ、第６図は受信最良点
サーチ回路を構成するマイクロプロセッサで実行サレる
、システムプログラムの構成を示スフローチャートであ
る。１・・・ＰＬＬシステム、２・・・妨害検出回路、３・
・・受信最良点サーチ回路、４・・・ボリューム、ＲＦ
・・・高周波増幅段、ＭＩＸ・・・混合段、ＩＦ・・・
中間周波増幅段、ＤＥＴ・・・検波段、Ｏ８Ｃ・・・局
部発振器。Figure 1 is a circuit diagram showing the schematic configuration of a conventional super-hetero gain type receiver, Figure 2 is a graph showing the relationship between the tuning frequency of the high-frequency amplification stage and the desired receiving station in the conventional receiver, and Figure 3. is a graph showing the attenuation characteristics in the high frequency amplification stage in the graph of Fig. 2, Fig. 4 is a circuit diagram showing an embodiment of the receiving device according to the present invention, and Fig. 5 is the interference removal principle of the receiving device of the present invention. FIG. 6 is a flowchart showing the structure of a system program executed by the microprocessor constituting the reception best point search circuit. 1...PLL system, 2...disturbance detection circuit, 3.
...Reception best point search circuit, 4...Volume, RF
...High frequency amplification stage, MIX...Mixing stage, IF...
Intermediate frequency amplification stage, DET...detection stage, O8C...local oscillator.

Claims

[Scope of utility model registration request]

1. A super-hetero gain type receiving device, characterized in that the tuning frequency in a high frequency amplification stage of the receiving device is configured to be independently variable.