JPS6430971U - - Google Patents
Info
- Publication number
- JPS6430971U JPS6430971U JP1987125371U JP12537187U JPS6430971U JP S6430971 U JPS6430971 U JP S6430971U JP 1987125371 U JP1987125371 U JP 1987125371U JP 12537187 U JP12537187 U JP 12537187U JP S6430971 U JPS6430971 U JP S6430971U
- Authority
- JP
- Japan
- Prior art keywords
- blanking
- signal
- video signal
- circuit
- composite video
- 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
- 239000002131 composite material Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は、本考案のＣＡＴＶ端末装置で用いら
れるブランキング回路の一実施例の回路図であり
、第２図は、第１図の動作を説明する図であり、
第３図は、第１図のタイムチヤートであり、第４
図は、ブランキング回路が復調器の複合映像信号
出力端子とテレビ受像機との間に介装されること
を示すブロツク回路図であり、第５図は、従来の
ブランキング回路の動作を説明するタイムチヤー
トである。
１０：ブランキング回路、１２：オペアンプ、
１３，１４，２０：抵抗、２１：制御用トランジ
スタ。
FIG. 1 is a circuit diagram of an embodiment of a blanking circuit used in a CATV terminal device of the present invention, and FIG. 2 is a diagram illustrating the operation of FIG. 1.
Figure 3 is the time chart of Figure 1, and the 4th
The figure is a block circuit diagram showing that a blanking circuit is interposed between the composite video signal output terminal of the demodulator and the television receiver, and FIG. 5 explains the operation of the conventional blanking circuit. This is a time chart. 10: blanking circuit, 12: operational amplifier,
13, 14, 20: Resistor, 21: Control transistor.
Claims (1)
信号が出力され、このブランキング信号に応じて
所定の期間は画像を消去するブランキング回路が
備えられたＣＡＴＶ端末装置において、前記ブラ
ンキング回路が、前記ブランキング信号を与えら
れて複合映像信号から映像信号を除去して同期信
号のみを出力するように構成されたことを特徴と
するＣＡＴＶ端末装置。 (2) 前記ブランキング回路は、前記複合映像信
号を増幅回路に入力し、前記ブランキング信号に
より前記増幅回路を前記複合映像信号の前記映像
信号が出力範囲を越えるように制御して前記同期
信号のみを出力するように構成されたことを特徴
とする実用新案登録請求の範囲第１項記載のＣＡ
ＴＶ端末装置。 (3) 前記ブランキング回路は、前記複合映像信
号をオペアンプのプラス入力端に与え、前記ブラ
ンキング信号により電圧が低下するバイアス電圧
を前記オペアンプのマイナス入力端に与えて構成
されたことを特徴とする実用新案登録請求の範囲
第２項記載のＣＡＴＶ端末装置。[Claims for Utility Model Registration] (1) A CATV equipped with a blanking circuit that outputs a blanking signal for a predetermined period of time in response to a channel selection operation and erases an image for a predetermined period of time in response to this blanking signal. A CATV terminal device, wherein the blanking circuit is configured to receive the blanking signal, remove the video signal from the composite video signal, and output only the synchronization signal. (2) The blanking circuit inputs the composite video signal to an amplifier circuit, controls the amplifier circuit using the blanking signal so that the video signal of the composite video signal exceeds an output range, and outputs the synchronization signal. The CA set forth in claim 1 of the utility model registration claim, characterized in that the CA is configured to output only
TV terminal equipment. (3) The blanking circuit is characterized in that the composite video signal is applied to a positive input terminal of an operational amplifier, and a bias voltage whose voltage is reduced by the blanking signal is applied to a negative input terminal of the operational amplifier. A CATV terminal device according to claim 2 of the utility model registration claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987125371U JPS6430971U (en) | 1987-08-18 | 1987-08-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987125371U JPS6430971U (en) | 1987-08-18 | 1987-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6430971U true JPS6430971U (en) | 1989-02-27 |
Family
ID=31375922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987125371U Pending JPS6430971U (en) | 1987-08-18 | 1987-08-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6430971U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717277A (en) * | 1980-07-07 | 1982-01-28 | Fujitsu General Ltd | Raster blanking circuit |
| JPS63142979A (en) * | 1986-12-06 | 1988-06-15 | Sony Corp | Video muting circuit for tv tuner |
-
1987
- 1987-08-18 JP JP1987125371U patent/JPS6430971U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5717277A (en) * | 1980-07-07 | 1982-01-28 | Fujitsu General Ltd | Raster blanking circuit |
| JPS63142979A (en) * | 1986-12-06 | 1988-06-15 | Sony Corp | Video muting circuit for tv tuner |
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