JPS62117836U - - Google Patents
Info
- Publication number
- JPS62117836U JPS62117836U JP355786U JP355786U JPS62117836U JP S62117836 U JPS62117836 U JP S62117836U JP 355786 U JP355786 U JP 355786U JP 355786 U JP355786 U JP 355786U JP S62117836 U JPS62117836 U JP S62117836U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- aft
- output
- circuit
- 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
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Television Receiver Circuits (AREA)
Description
第１図ないし第３図は本考案の一実施例を示す
もので、第１図は回路構成を示すブロツク図、第
２図は動作を説明するためのフローチヤート、第
３図は第１図におけるデジタルＡＦＴ回路の詳細
を示すブロツク図、第４図は従来のオートチユー
ニング回路を示すブロツク図である。
１１…チユーナ、１２…リニアＡＦＴ回路、１
３…チユーニング電圧制御回路、１４…リニア回
路、１５…コンパレータ、１６，１６ａ…カウン
タ制御回路、１７…Ｕ／Ｄカウンタ、１８…パル
ス幅変調回路、２０…デジタルＡＦＴ回路。
Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a block diagram showing the circuit configuration, Figure 2 being a flowchart for explaining the operation, and Figure 3 being the same as Figure 1. FIG. 4 is a block diagram showing details of the digital AFT circuit in FIG. 4, and FIG. 4 is a block diagram showing the conventional autotuning circuit. 11...Tuner, 12...Linear AFT circuit, 1
3... Tuning voltage control circuit, 14... Linear circuit, 15... Comparator, 16, 16a... Counter control circuit, 17... U/D counter, 18... Pulse width modulation circuit, 20... Digital AFT circuit.
Claims (1)
するチユーナと、このチユーナから出力される中
間周波信号を検波してＡＦＴ信号を発生する手段
と、この手段から出力されるＡＦＴ信号を基準信
号と比較してＡＦＴ―Ｌ信号及びＡＦＴ―Ｈ信号
を出力するコンパレータと、上記ＡＦＴ―Ｌ信号
、ＡＦＴ―Ｈ信号及びチヤンネルのアツプ／ダウ
ン操作信号に従つてアツプ／ダウン指令、クロツ
クパルス、チユーニング終了信号を出力するカウ
ンタ制御回路と、上記アツプ／ダウン操作信号に
基づくチユーニング中は上記カウンタ制御回路か
らのアツプ／ダウン指令及びクロツクパルスをそ
のまま出力し、上記カウンタ制御回路からチユー
ニング終了信号が出力された後は、上記コンパレ
ータから出力されるＡＦＴ―Ｌ信号及びＡＦＴ―
Ｈ信号に基づいてアツプ／ダウン指令及びクロツ
クパルスを出力するデジタルＡＦＴ回路と、この
デジタルＡＦＴ回路の出力信号に従つてアツプ／
ダウン動作するＵ／Ｄカウンタと、このＵ／Ｄカ
ウンタのカウント値に応じて上記チユーナのチユ
ーニング動作を制御する手段とを具備したことを
特徴とするオートチユーニング回路。 A tuner that receives television broadcast radio waves and converts them into an intermediate frequency signal, means that detects the intermediate frequency signal output from the tuner and generates an AFT signal, and compares the AFT signal output from this means with a reference signal. A comparator that outputs the AFT-L signal and AFT-H signal, and outputs up/down commands, clock pulses, and tuning end signals according to the AFT-L signal, AFT-H signal, and channel up/down operation signals. During tuning based on the up/down operation signal, the up/down commands and clock pulses from the counter control circuit are output as they are, and after the tuning end signal is output from the counter control circuit, the up/down commands and clock pulses are output as they are. AFT-L signal and AFT- output from the comparator
A digital AFT circuit outputs an up/down command and a clock pulse based on the H signal, and an up/down circuit outputs an up/down command according to the output signal of this digital AFT circuit.
An auto-tuning circuit comprising: a U/D counter that performs a down operation; and means for controlling the tuning operation of the tuner according to the count value of the U/D counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP355786U JPS62117836U (en) | 1986-01-14 | 1986-01-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP355786U JPS62117836U (en) | 1986-01-14 | 1986-01-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62117836U true JPS62117836U (en) | 1987-07-27 |
Family
ID=30783425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP355786U Pending JPS62117836U (en) | 1986-01-14 | 1986-01-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62117836U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5278302A (en) * | 1975-12-24 | 1977-07-01 | Sony Corp | Channel selection equipment |
| JPS5396602A (en) * | 1977-02-02 | 1978-08-24 | Matsushita Electric Ind Co Ltd | Channel selector |
| JPS5639619A (en) * | 1979-09-06 | 1981-04-15 | Pioneer Electronic Corp | Automatic controller for tuning frequency |
-
1986
- 1986-01-14 JP JP355786U patent/JPS62117836U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5278302A (en) * | 1975-12-24 | 1977-07-01 | Sony Corp | Channel selection equipment |
| JPS5396602A (en) * | 1977-02-02 | 1978-08-24 | Matsushita Electric Ind Co Ltd | Channel selector |
| JPS5639619A (en) * | 1979-09-06 | 1981-04-15 | Pioneer Electronic Corp | Automatic controller for tuning frequency |
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