JPS62151230U - - Google Patents
Info
- Publication number
- JPS62151230U JPS62151230U JP3889386U JP3889386U JPS62151230U JP S62151230 U JPS62151230 U JP S62151230U JP 3889386 U JP3889386 U JP 3889386U JP 3889386 U JP3889386 U JP 3889386U JP S62151230 U JPS62151230 U JP S62151230U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- comparator
- aft
- output
- analog switch
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図ないし第５図は本考案の一実施例を示す
もので、第１図は概略構成を示すブロツク図、第
２図は第１図のコンパレート回路の詳細を示す図
、第３図はチユーニング動作を説明するためのタ
イミングチヤート、第４図はチユーニングアツプ
時の動作を示すフローチヤート、第５図はチユー
ニングダウン時の動作を示すフローチヤート、第
６図は従来のデジタルチユーニング回路の概略構
成を示すブロツク図、第７図は第１図におけるコ
ンパレート回路の構成例を示す図である。
１１……チユーナ、１２……検波回路、１３，
１３Ａ……コンパレート回路、１４，１４Ａ……
パルス幅変調回路、１５……ローパスフイルタ／
増幅回路、３１……コンパレータ、３２……アナ
ログスイツチ。
1 to 5 show an embodiment of the present invention, in which FIG. 1 is a block diagram showing a schematic configuration, FIG. 2 is a diagram showing details of the comparator circuit shown in FIG. 1, and FIG. is a timing chart for explaining the tuning operation, FIG. 4 is a flowchart showing the operation when tuning up, FIG. 5 is a flowchart showing the operation when tuning down, and FIG. 6 is the conventional digital tuning. FIG. 7 is a block diagram showing a schematic configuration of the circuit, and is a diagram showing an example of the configuration of the comparator circuit in FIG. 1. 11... Tuner, 12... Detection circuit, 13,
13A...Comparator circuit, 14,14A...
Pulse width modulation circuit, 15...Low pass filter/
Amplifier circuit, 31... comparator, 32... analog switch.
Claims (1)
力端子に第１の抵抗を介してＡＦＴ信号を供給す
る手段と、上記コンパレータの他方の入力端子に
上記ＡＦＴ信号の中心レベルに対応する基準電圧
を供給する手段と、上記コンパレータの一方の入
力端子と出力端子との間に接続される第２の抵抗
及びアナログスイツチの直列回路と、上記コンパ
レータの出力信号をＡＦＴ―Ｈ信号として出力す
る手段と、上記コンパレータの出力信号を反転し
てＡＦＴ―Ｌ信号として出力するインバータと、
上記ＡＦＴ―Ｈ信号あるいはＡＦＴ―Ｌ信号の出
力状態を検出して上記アナログスイツチをオン／
オフ制御する手段とを具備し、上記アナログスイ
ツチのオン／オフ制御により上記コンパレータの
スレシホールドレベルを切換えて上記ＡＦＴ信号
の中心レベルを検出するように構成したことを特
徴とするデジタルチユーニング回路。 a comparator; means for supplying an AFT signal to one input terminal of the comparator via a first resistor; and means for supplying a reference voltage corresponding to the center level of the AFT signal to the other input terminal of the comparator. , a series circuit of a second resistor and an analog switch connected between one input terminal and an output terminal of the comparator, means for outputting the output signal of the comparator as an AFT-H signal, and an output of the comparator. an inverter that inverts the signal and outputs it as an AFT-L signal;
Detects the output state of the AFT-H signal or AFT-L signal and turns on/off the analog switch.
A digital tuning circuit characterized in that it is configured to detect the center level of the AFT signal by switching the threshold level of the comparator by on/off control of the analog switch. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3889386U JPH0434582Y2 (en) | 1986-03-17 | 1986-03-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3889386U JPH0434582Y2 (en) | 1986-03-17 | 1986-03-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62151230U true JPS62151230U (en) | 1987-09-25 |
| JPH0434582Y2 JPH0434582Y2 (en) | 1992-08-18 |
Family
ID=30851563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3889386U Expired JPH0434582Y2 (en) | 1986-03-17 | 1986-03-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0434582Y2 (en) |
-
1986
- 1986-03-17 JP JP3889386U patent/JPH0434582Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0434582Y2 (en) | 1992-08-18 |
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