JPS59183031U - AFT circuit - Google Patents
AFT circuitInfo
- Publication number
- JPS59183031U JPS59183031U JP7630283U JP7630283U JPS59183031U JP S59183031 U JPS59183031 U JP S59183031U JP 7630283 U JP7630283 U JP 7630283U JP 7630283 U JP7630283 U JP 7630283U JP S59183031 U JPS59183031 U JP S59183031U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- resistor
- aft
- end connected
- tuning
- 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
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
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ａはチューナ部のＶＨＦ用の局部発振回路を示す
概略図、第１図すはＵＨＦ用の局部発振回路を示す概略
図、第２図はアメリカのテレビジョン受像機のチューナ
部の局部発振回路におけるＡＦＴ電圧の変化と発振周波
数の変化との関係を示す図であり、ａはＶＨＦローバン
ドの図、ｂはＶＨＦハイバンドの図、ＣはＵＨＦバンド
の図、第３図は本考案の一実施例を示す図、第４図は第
３図の回路のＡＦＴ電圧の変化と発振周波数の変化との
関係を示す図であり、ａはＶＨＦローバンド、ｂはＶＨ
Ｆハイバンド、ＣはＵＨＦバンドの図であ −る
。 ・
２・・・・・・ＡＦＴ電圧出力端子、５・・・・・・Ａ
ＦＴ電圧入力端子、６・・・・・・比較回路、７・・・
・・・スイッチ部、８・・・・・・端子、Ｒｏ・・・・
・・第１抵抗、Ｒ２・・・・・・第２抵抗。Figure 1a is a schematic diagram showing the local oscillation circuit for VHF in the tuner section, Figure 1 is a schematic diagram showing the local oscillation circuit for UHF, and Figure 2 is a schematic diagram showing the local oscillation circuit for UHF in the tuner section. FIG. 3 is a diagram showing the relationship between changes in AFT voltage and changes in oscillation frequency in an oscillation circuit, where a is a diagram of the VHF low band, b is a diagram of the VHF high band, C is a diagram of the UHF band, and FIG. 3 is a diagram of the VHF low band. FIG. 4 is a diagram showing a relationship between changes in AFT voltage and changes in oscillation frequency in the circuit shown in FIG. 3, where a is a VHF low band and b is a VH
F is a diagram of the high band, and C is a diagram of the UHF band.・2...AFT voltage output terminal, 5...A
FT voltage input terminal, 6... Comparison circuit, 7...
...Switch part, 8...Terminal, Ro...
...First resistor, R2...Second resistor.
Claims (1)
出力端子に接続された第１の抵抗と一端が前記第１の抵
抗の他端に接続され他端が第２の抵抗の一端に接続され
たスイッチ部と、前記第２の抵抗の他端に設けられ前記
ＡＦＴ電圧の中心電圧と同じ値の電圧が印加される端子
と、予め定められた基準電圧値と同調電圧値を比較し前
記同調電圧が前記基準電圧よりも高くなると前記スイッ
チ部をオンとする制御信号を出力する比較回路を備え′
ることを特徴とするＡＦＴ回路。a first resistor having one end connected to an AFT voltage input terminal and the other end connected to an AFT voltage output terminal; one end connected to the other end of the first resistor and the other end connected to one end of a second resistor; and a terminal provided at the other end of the second resistor to which a voltage of the same value as the center voltage of the AFT voltage is applied, and a predetermined reference voltage value and a tuning voltage value are compared and the tuning is performed. A comparison circuit is provided that outputs a control signal that turns on the switch section when the voltage becomes higher than the reference voltage.
An AFT circuit characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7630283U JPS59183031U (en) | 1983-05-20 | 1983-05-20 | AFT circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7630283U JPS59183031U (en) | 1983-05-20 | 1983-05-20 | AFT circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59183031U true JPS59183031U (en) | 1984-12-06 |
Family
ID=30206349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7630283U Pending JPS59183031U (en) | 1983-05-20 | 1983-05-20 | AFT circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59183031U (en) |
-
1983
- 1983-05-20 JP JP7630283U patent/JPS59183031U/en active Pending
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