JPS63117168U - - Google Patents
Info
- Publication number
- JPS63117168U JPS63117168U JP938987U JP938987U JPS63117168U JP S63117168 U JPS63117168 U JP S63117168U JP 938987 U JP938987 U JP 938987U JP 938987 U JP938987 U JP 938987U JP S63117168 U JPS63117168 U JP S63117168U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- noise
- video signals
- video
- discriminating
- 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
- 238000000926 separation method Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
Description
第１図は本考案の映像信号判別回路を示す回路
図、第２図は従来の映像信号判別回路を示す回路
図である。
１５……同期分離回路、１６，２０……コンデ
ンサ、１７……判別回路、１８……トランジスタ
、２１……スイツチ。
FIG. 1 is a circuit diagram showing a video signal discriminating circuit according to the present invention, and FIG. 2 is a circuit diagram showing a conventional video signal discriminating circuit. 15...Synchronization separation circuit, 16, 20...Capacitor, 17...Discrimination circuit, 18...Transistor, 21...Switch.
Claims (1)
て送信される第２の映像信号を受信するチユーナ
を設けた電子機器において、前記第１及び第２の
映像信号から同期信号を分離する同期分離回路と
、前記第１及び第２の映像信号が離調した際に前
記同期信号中のノイズを除去するノイズ除去回路
と、前記第１及び第２の映像信号の何れか一方の
受信状態に応じて切換可能なスイツチと、該スイ
ツチの切換に応じ、前記ノイズ除去回路にて除去
される前記同期信号中のノイズ量を制御する制御
素子と、前記第１及び第２の映像信号を受信した
際に有局状態を判別する判別回路より成り、前記
ノイズ除去回路から出力される前記同期信号中の
ノイズ量によつて、前記第１及び第２の映像信号
の何れか一方の受信状態における前記判別回路の
有局判別感度を可変することを特徴とする映像信
号判別回路。 In an electronic device equipped with a tuner that receives a first video signal transmitted by wire and a second video signal transmitted wirelessly, synchronization is performed to separate a synchronization signal from the first and second video signals. a separation circuit, a noise removal circuit that removes noise in the synchronization signal when the first and second video signals are out of tune, and a reception state of one of the first and second video signals; a control element that controls the amount of noise in the synchronization signal to be removed by the noise removal circuit in accordance with the switching of the switch; and a control element that receives the first and second video signals. and a discriminating circuit for discriminating whether the station is present in the receiving state of either the first or second video signal, depending on the amount of noise in the synchronizing signal output from the noise removing circuit. A video signal discriminating circuit characterized by varying the station presence discrimination sensitivity of the discriminating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP938987U JPS63117168U (en) | 1987-01-26 | 1987-01-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP938987U JPS63117168U (en) | 1987-01-26 | 1987-01-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63117168U true JPS63117168U (en) | 1988-07-28 |
Family
ID=30794657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP938987U Pending JPS63117168U (en) | 1987-01-26 | 1987-01-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63117168U (en) |
-
1987
- 1987-01-26 JP JP938987U patent/JPS63117168U/ja active Pending