JPH028266U - - Google Patents
Info
- Publication number
- JPH028266U JPH028266U JP8522188U JP8522188U JPH028266U JP H028266 U JPH028266 U JP H028266U JP 8522188 U JP8522188 U JP 8522188U JP 8522188 U JP8522188 U JP 8522188U JP H028266 U JPH028266 U JP H028266U
- Authority
- JP
- Japan
- Prior art keywords
- tuning
- clock
- voltage
- auto
- aft
- 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 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図乃至第３図はこの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図はチユーニング動作内容を示すフローチヤー
ト、第３図はチユーニングアツプ時のＡＦＴ信号
と比較電圧の特性を示す図、第４図は従来のオー
トチユーニング回路の構成を示すブロツク図、第
５図は第４図のチユーニング動作内容を示すフロ
ーチヤート、第６図は第５図に基づいたチユーニ
ングアツプ時のＡＦＴ信号と比較電圧の特性原理
を示す図、第７図はチユーニングアツプ時のＡＦ
Ｔ信号と比較電圧の実際の変化特性を示す図であ
る。
１……キー制御回路、２，２２……状態カウン
タ、３，２３……マルチプレクサ、４……同調電
圧カウンタ、５……ＰＷＭ回路、６……ローパス
フイルタ、７……チユーナ回路、８……アンテナ
、９……ＡＦＴ検波回路、１０……ＴＶリニア回
路、１１……同期分離回路、１２……同期判別回
路、１３，２１……比較回路、１４，２０……コ
ントロール回路。
Figures 1 to 3 show an embodiment of this invention, with Figure 1 being a block diagram showing the circuit configuration, Figure 2 being a flowchart showing the details of the tuning operation, and Figure 3 being the time of tuning up. Figure 4 is a block diagram showing the configuration of a conventional auto-tuning circuit, Figure 5 is a flowchart showing the tuning operation of Figure 4, and Figure 6 is a diagram showing the characteristics of the AFT signal and comparison voltage. A diagram showing the characteristic principle of the AFT signal and comparison voltage at the time of tuning up based on Figure 5, and Figure 7 shows the AF at the time of tuning up.
FIG. 3 is a diagram showing actual change characteristics of a T signal and a comparison voltage. DESCRIPTION OF SYMBOLS 1... Key control circuit, 2, 22... Status counter, 3, 23... Multiplexer, 4... Tuning voltage counter, 5... PWM circuit, 6... Low pass filter, 7... Tuner circuit, 8... Antenna, 9...AFT detection circuit, 10...TV linear circuit, 11...Synchronization separation circuit, 12...Synchronization determination circuit, 13, 21...Comparison circuit, 14, 20...Control circuit.
Claims (1)
装置において、 チユーニングアツプ／ダウンを指示するチユー
ニングキーと、 テレビ映像信号をＡＦＴ検波して得たＡＦＴ信
号を比較電圧とする比較手段と、 周波数の異なる高中低速の３種類のクロツクを
発生するクロツク発生手段と、 チユーニング電圧に対応するカウント値をカウ
ントする同調電圧カウンタと、 上記比較手段の比較結果と上記チユーニングキ
ーの指示内容に応じて上記クロツク発生手段の発
生するクロツクを選択し、上記同調電圧カウンタ
にカウントアツプ／ダウンの動作クロツクとして
供給するクロツク供給手段と を具備したことを特徴とするオートチユーニング
装置。[Claim for Utility Model Registration] In an auto-tuning device used in a television receiver, a tuning key for instructing tuning up/down, and an AFT signal obtained by AFT detection of a television video signal are used as a comparison voltage. a clock generating means that generates three types of high, medium and low speed clocks with different frequencies; a tuning voltage counter that counts a count value corresponding to the tuning voltage; and a comparison result of the above comparing means and the above tuning key. An auto-tuning device comprising: clock supply means for selecting a clock generated by the clock generation means in accordance with instruction contents and supplying the clock to the tuning voltage counter as a count-up/down operation clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8522188U JPH028266U (en) | 1988-06-28 | 1988-06-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8522188U JPH028266U (en) | 1988-06-28 | 1988-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH028266U true JPH028266U (en) | 1990-01-19 |
Family
ID=31309894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8522188U Pending JPH028266U (en) | 1988-06-28 | 1988-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH028266U (en) |
-
1988
- 1988-06-28 JP JP8522188U patent/JPH028266U/ja active Pending
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