JPS61174223U - - Google Patents
Info
- Publication number
- JPS61174223U JPS61174223U JP5614685U JP5614685U JPS61174223U JP S61174223 U JPS61174223 U JP S61174223U JP 5614685 U JP5614685 U JP 5614685U JP 5614685 U JP5614685 U JP 5614685U JP S61174223 U JPS61174223 U JP S61174223U
- Authority
- JP
- Japan
- Prior art keywords
- tuner
- input
- voltage
- power supply
- control terminal
- 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
- 238000001514 detection method Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案に係る自動周波数制御装置の一
実施例を示す回路図、第２図は本考案の動作を説
明するための各部動作波形図、第３図は本考案に
用いる電源変動検出手段の他の実施例を示す回路
図、第４図は従来の制御回路の一例を示す回路図
、第５図は制御電圧の特性を示す特性図、第６図
はチユーナのキヤリブレーシヨン特性を示す特性
図である。
１ａ……チユーナ、１ｂ……映像中間周波増幅
回路、２……ＡＦＴスイツチ回路、３……ＡＦＴ
スイツチ・コントロール回路、１１……電源変動
検出回路、Ｑ１，Ｑ３，Ｑ４……トランジスタ、
Ｑ２……電界効果トランジスタ、Ｒ１〜Ｒ９……
抵抗、Ｃ１，Ｃ２……コンデンサ、Ｄ１，Ｄ２…
…ダイオード。
Fig. 1 is a circuit diagram showing an embodiment of the automatic frequency control device according to the present invention, Fig. 2 is a waveform diagram of each part operating to explain the operation of the present invention, and Fig. 3 is a power supply fluctuation detection used in the present invention. FIG. 4 is a circuit diagram showing an example of a conventional control circuit, FIG. 5 is a characteristic diagram showing control voltage characteristics, and FIG. 6 is a diagram showing tuner calibration characteristics. FIG. 1a...Tuner, 1b...Video intermediate frequency amplification circuit, 2...AFT switch circuit, 3...AFT
Switch control circuit, 11...Power supply fluctuation detection circuit, Q1 , Q3 , Q4 ...Transistor,
Q 2 ... field effect transistor, R 1 to R 9 ...
Resistance, C 1 , C 2 ... Capacitor, D 1 , D 2 ...
…diode.
Claims (1)
ずれを補正するＡＦＣ電圧を発生する手段と、 電源電圧に比例した直流電圧をチユーナの周波
数制御端子に供給する手段と、 前記電源電圧の瞬時の低下を検出して制御信号
を発生する電源変動検出手段と、 入・出力端および制御端を有し、入・出力端の
うち一方を前記ＡＦＣ電圧発生手段に接続し、他
方を前記チユーナの周波数制御端子に接続し、制
御端に前記制御信号を供給しその制御信号に応じ
て入・出力端間を断・続せしめるスイツチ手段と
を具備し、 前記電源電圧の瞬時の低下が検出されたとき、
所定期間前記スイツチ手段の入・出力端間を断路
状態にして前記チユーナへのＡＦＣ電圧の供給を
禁止するようにした自動周波数制御装置。[Claims for Utility Model Registration] Means for generating an AFC voltage for correcting deviations in the local oscillation frequency of the tuner, means for supplying a DC voltage proportional to the power supply voltage to the frequency control terminal of the tuner; power supply fluctuation detection means for detecting an instantaneous drop in the power supply voltage and generating a control signal; an input/output terminal and a control terminal, one of the input/output terminals being connected to the AFC voltage generation means; switch means for connecting the other end to the frequency control terminal of the tuner, supplying the control signal to the control terminal and switching on and off the input and output terminals in accordance with the control signal; When a drop is detected,
An automatic frequency control device configured to disconnect the input and output terminals of the switch means for a predetermined period of time, thereby prohibiting the supply of AFC voltage to the tuner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5614685U JPS61174223U (en) | 1985-04-17 | 1985-04-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5614685U JPS61174223U (en) | 1985-04-17 | 1985-04-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61174223U true JPS61174223U (en) | 1986-10-30 |
Family
ID=30579468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5614685U Pending JPS61174223U (en) | 1985-04-17 | 1985-04-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61174223U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635527A (en) * | 1979-08-30 | 1981-04-08 | Matsushita Electric Ind Co Ltd | Afc defeating device |
-
1985
- 1985-04-17 JP JP5614685U patent/JPS61174223U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635527A (en) * | 1979-08-30 | 1981-04-08 | Matsushita Electric Ind Co Ltd | Afc defeating device |
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