JPS60158329U

JPS60158329U - Automatic scanning circuit for electronic tuning radio

Info

Publication number: JPS60158329U
Application number: JP4420084U
Authority: JP
Inventors: 今川　敏幸
Original assignee: クラリオン株式会社
Priority date: 1984-03-29
Filing date: 1984-03-29
Publication date: 1985-10-22

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 the drawing]

第１図は本考案による電子同調用ラジオの自動スキャン
回路およびそれに関連する受信機の一部のブロック図、
第２図はチャージ・ポンプ出力電圧の時間推移を示すダ
イヤグラム、第３図はパルス整形回路の出力波形図、第
４図はＴ−フリップフロップの出力波形図である。１・・・電子同調用ＡＭチューナ、２・・・電子同調用
ＦＭチューナ、３・・−ＡＭ／ＦＭラジオ用ＰＬＬシン
セサイザおよびコントローラ、４・・・バッファ回路、
５・・・電圧比較器、６・・・パルス整形回路、７，８
・・・Ｔ−フリップフロップ、９．１５・・・スイッチ
ング゛回路、１０・・・パルス発生回路、１１・・・ラ
ジオ電源切換え回路、１２．１３・・・電圧検出回路、
１４・・・パルス幅可変用スイッチング回路、１６・・
・発振器、１７・・・低周波増幅器、１８・・・スピー
カ、１９・・・ＦＭ／ＡＭ検波器の出力端子、２０・・
・音量調節器、２１・・・ＦＭ受信機に至る電源回路、
２２・・・個受信機に至る電源回路、Ｅ　Ｑｌ・・・Ａ
Ｍ位相検波器のチャージ・ポンプ出力、ＥＱ２・・・Ｆ
Ｍ位相検波器のチャージ・ポンプ出力、ＶＴＡＭ・・・
心チューナの可変容量ダイオード制御用端子、ＶＴＦＭ
・・・ＦＭチューナの可変容量ダイオード制御用端子、
Ｔｒ□〜Ｔｒ２・・・８２Ｍトランジスタ、Ｒ□〜Ｒ□
８・・・抵抗、′Ｃ１，Ｃ２・・・Ｔ−フリップフロッ
プの入力、Ｃ３〜Ｃ５・・・コンデンサ。FIG. 1 is a block diagram of a part of an automatic scanning circuit of an electronic tuning radio according to the present invention and a receiver related thereto;
FIG. 2 is a diagram showing the time course of the charge pump output voltage, FIG. 3 is an output waveform diagram of the pulse shaping circuit, and FIG. 4 is an output waveform diagram of the T-flip-flop. DESCRIPTION OF SYMBOLS 1... AM tuner for electronic tuning, 2... FM tuner for electronic tuning, 3... PLL synthesizer and controller for AM/FM radio, 4... Buffer circuit,
5... Voltage comparator, 6... Pulse shaping circuit, 7, 8
... T-flip-flop, 9.15... Switching circuit, 10... Pulse generation circuit, 11... Radio power supply switching circuit, 12.13... Voltage detection circuit,
14... Switching circuit for variable pulse width, 16...
- Oscillator, 17...Low frequency amplifier, 18...Speaker, 19...FM/AM detector output terminal, 20...
・Volume adjuster, 21...Power circuit leading to FM receiver,
22... Power supply circuit leading to the receiver, E Ql...A
M-phase detector charge pump output, EQ2...F
M-phase detector charge pump output, VTAM...
Heart tuner variable capacitance diode control terminal, VTFM
...FM tuner variable capacitance diode control terminal,
Tr□~Tr2...82M transistor, R□~R□
8...Resistor, 'C1, C2...T-flip-flop input, C3-C5...Capacitor.

Claims

[Claims for Utility Model Registration] The output voltage of the charge pump of the phase detector is applied to a variable capacitance diode and used as a tuning voltage, and at the same time, the output voltage is applied to a predetermined standard using a voltage comparator. When the output voltage exceeds the reference voltage, the voltage comparator output passes through a pulse shaping circuit to generate an output pulse. The above output pulse is reduced by a flip-flop circuit, and the thus reduced pulse switches the band and operates the oscillator for a certain period of time to generate an electronic sound, at which time the electronic sound differs from band to band. An automatic scanning circuit for an electronic tuning radio characterized by