JPS5876240U - Tuning circuit - Google Patents
Tuning circuitInfo
- Publication number
- JPS5876240U JPS5876240U JP17136781U JP17136781U JPS5876240U JP S5876240 U JPS5876240 U JP S5876240U JP 17136781 U JP17136781 U JP 17136781U JP 17136781 U JP17136781 U JP 17136781U JP S5876240 U JPS5876240 U JP S5876240U
- Authority
- JP
- Japan
- Prior art keywords
- tuning
- circuit
- tuning voltage
- oscillation
- generation circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
第１図は本考物の一実施例の選局回路の回路図、第２図
はスキャンスイッチＳ工のオン時の第１図における■点
の電圧変化特性図である。
１・・・アンテナ、２・・・フロントエンド、３・・・
中間周波増幅回路、４・・・同調電圧発生回路、５・・
・発振回路、６・・・同調検出回路、７・・・時定数回
路。FIG. 1 is a circuit diagram of a channel selection circuit according to an embodiment of the present invention, and FIG. 2 is a voltage change characteristic diagram at point ■ in FIG. 1 when the scan switch S is turned on. 1... antenna, 2... front end, 3...
Intermediate frequency amplification circuit, 4... Tuning voltage generation circuit, 5...
- Oscillation circuit, 6... Tuning detection circuit, 7... Time constant circuit.
Claims (1)
ナ内のバリキャップに与えるべき同調電圧を発生する同
調電圧発生回路と、該同調電圧発生回路にて発生する同
調電圧を変化させる速度を決める発振回路と、該発振回
路の発振周波数を２段階に変化させるスイッチ手段と、
上記発振回路による上記同調電圧発生回路の同調電圧変
化を能動にさせるスキャンスイッチとで成り、該スキャ
ンスイッチ操作中に局受信が行なわれることにより上記
スイッチ手段によって発振回路の発振周波数が低下して
同調電圧の変化が遅くなることを特徴とする選局回路。In a receiver equipped with an electronic tuner, a tuning voltage generation circuit generates a tuning voltage to be applied to a varicap in the electronic tuner, and an oscillation circuit determines a speed at which the tuning voltage generated in the tuning voltage generation circuit is changed. , a switch means for changing the oscillation frequency of the oscillation circuit in two steps;
and a scan switch that activates the tuning voltage change of the tuning voltage generation circuit by the oscillation circuit, and when station reception is performed while the scan switch is operated, the oscillation frequency of the oscillation circuit is lowered by the switch means and the tuning is performed. A tuning circuit characterized by slow voltage changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17136781U JPS5876240U (en) | 1981-11-19 | 1981-11-19 | Tuning circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17136781U JPS5876240U (en) | 1981-11-19 | 1981-11-19 | Tuning circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5876240U true JPS5876240U (en) | 1983-05-23 |
Family
ID=29963294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17136781U Pending JPS5876240U (en) | 1981-11-19 | 1981-11-19 | Tuning circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5876240U (en) |
-
1981
- 1981-11-19 JP JP17136781U patent/JPS5876240U/en active Pending
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