JPH03121724U - - Google Patents
Info
- Publication number
- JPH03121724U JPH03121724U JP1990030307U JP3030790U JPH03121724U JP H03121724 U JPH03121724 U JP H03121724U JP 1990030307 U JP1990030307 U JP 1990030307U JP 3030790 U JP3030790 U JP 3030790U JP H03121724 U JPH03121724 U JP H03121724U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- automatic
- synchronization
- 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
- 230000005684 electric field Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案の一実施例のブロツク図である
。
１……チユーナ、２……映像中間周波ＩＣ、３
……同期判定回路、４……選局回路、６……入力
レベル判定回路。
FIG. 1 is a block diagram of one embodiment of the present invention. 1...Tuner, 2...Video intermediate frequency IC, 3
...Synchronization judgment circuit, 4...Tuning selection circuit, 6...Input level judgment circuit.
Claims (1)
び同期信号の有無に対応する同期判定出力に基づ
いて、オートサーチを行う自動選局回路において
、 ＡＧＣ回路からのＡＧＣ電圧と基準電圧とを比
較して入力電波の電界強度が所定の強度以上であ
るか否かを判定する入力レベル判定回路を設け、 前記ＡＦＴ回路の出力電圧が所定の電圧範囲に
あるとともに、前記同期判定出力が同期信号有り
に対応し、かつ、前記入力レベル判定回路の判定
出力が、前記所定の強度以上に対応したときのみ
、オートサーチを停止することを特徴とする自動
選局回路。[Scope of Utility Model Registration Claim] In an automatic tuning circuit that performs automatic search based on the output voltage of an AFT (automatic frequency adjustment) circuit and a synchronization judgment output corresponding to the presence or absence of a synchronization signal, An input level determination circuit is provided which determines whether the electric field strength of the input radio wave is equal to or higher than a predetermined strength by comparing it with a reference voltage, and the output voltage of the AFT circuit is within a predetermined voltage range and the synchronization determination circuit is provided. An automatic channel selection circuit characterized in that automatic search is stopped only when the output corresponds to the presence of a synchronization signal and the determination output of the input level determination circuit corresponds to the predetermined strength or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990030307U JPH03121724U (en) | 1990-03-24 | 1990-03-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990030307U JPH03121724U (en) | 1990-03-24 | 1990-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03121724U true JPH03121724U (en) | 1991-12-12 |
Family
ID=31533030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990030307U Pending JPH03121724U (en) | 1990-03-24 | 1990-03-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03121724U (en) |
-
1990
- 1990-03-24 JP JP1990030307U patent/JPH03121724U/ja active Pending
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