JPH01169883U - - Google Patents
Info
- Publication number
- JPH01169883U JPH01169883U JP1988066179U JP6617988U JPH01169883U JP H01169883 U JPH01169883 U JP H01169883U JP 1988066179 U JP1988066179 U JP 1988066179U JP 6617988 U JP6617988 U JP 6617988U JP H01169883 U JPH01169883 U JP H01169883U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- output
- level
- video signal
- 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 7
- 238000009499 grossing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は、本考案の一実施例を示す回路図、第
２図は従来のＣＡＴＶ用インターフエース回路を
示す回路図、第３図イ，ロ及びハは第１図及び第
２図の説明に供する為の波形図、第４図及び第５
図はレベルシフト回路の具体回路例を示す回路図
である。
２……ＶＩＦアンプ、３……検波回路、６……
デイスクランブル回路、９……ピーク検波回路、
１２……レベルシフト回路。
Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing a conventional CATV interface circuit, and Fig. 3 A, B, and C are explanations of Figs. 1 and 2. Waveform diagrams, Figures 4 and 5 for use in
The figure is a circuit diagram showing a specific circuit example of a level shift circuit. 2...VIF amplifier, 3...detection circuit, 6...
Descramble circuit, 9 ...Peak detection circuit,
12...Level shift circuit.
Claims (1)
を増幅するＶＩＦ増幅回路と、該ＶＩＦ増幅回路
の出力ＶＩＦ信号を検波する検波回路と、該検波
回路からの検波された映像信号をレベルシフトす
るレベルシフト回路と、該レベルシフト回路から
の映像信号をデイスクランブルするデイスクラン
ブル回路と、該デイスクランブル回路の出力映像
信号をピーク検波し、その検波出力に応じて前記
ＶＩＦ増幅回路の利得を制御するピーク検波回路
とから成ることを特徴とするＣＡＴＶ用インター
フエイス回路。 (2) ピーク検波回路は入力映像信号の同期信号
先端レベルと基準電圧とを比較するコンパレータ
と、該コンパレータの出力信号を平滑する平滑回
路とから成り、到来する映像信号の同期信号先端
レベルを前記基準電圧のレベルに一致させるよう
に制御することを特徴とする請求項第１項記載の
ＣＡＴＶ用インターフエイス回路。[Claims for Utility Model Registration] (1) A VIF amplifier circuit that amplifies a scramble-modulated television signal, a detection circuit that detects the output VIF signal of the VIF amplifier circuit, and a video image detected from the detection circuit. a level shift circuit that level-shifts a signal; a descramble circuit that descrambles a video signal from the level shift circuit; and a VIF amplifier circuit that performs peak detection on the output video signal of the descramble circuit and detects the peak of the video signal output from the descramble circuit. 1. A CATV interface circuit comprising: a peak detection circuit for controlling the gain of the CATV interface circuit. (2) The peak detection circuit consists of a comparator that compares the synchronization signal leading edge level of the input video signal with a reference voltage, and a smoothing circuit that smoothes the output signal of the comparator. 2. The CATV interface circuit according to claim 1, wherein the CATV interface circuit is controlled to match the level of the reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988066179U JPH01169883U (en) | 1988-05-19 | 1988-05-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988066179U JPH01169883U (en) | 1988-05-19 | 1988-05-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01169883U true JPH01169883U (en) | 1989-11-30 |
Family
ID=31291591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988066179U Pending JPH01169883U (en) | 1988-05-19 | 1988-05-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01169883U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60109390A (en) * | 1983-11-17 | 1985-06-14 | Sony Corp | Scramble system of television signal |
| JPS60239188A (en) * | 1984-05-12 | 1985-11-28 | Sony Corp | Television signal demodulator |
| JPS62236290A (en) * | 1986-03-27 | 1987-10-16 | アールシーエー トムソン ライセンシング コーポレイシヨン | Automatic gain controller |
-
1988
- 1988-05-19 JP JP1988066179U patent/JPH01169883U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60109390A (en) * | 1983-11-17 | 1985-06-14 | Sony Corp | Scramble system of television signal |
| JPS60239188A (en) * | 1984-05-12 | 1985-11-28 | Sony Corp | Television signal demodulator |
| JPS62236290A (en) * | 1986-03-27 | 1987-10-16 | アールシーエー トムソン ライセンシング コーポレイシヨン | Automatic gain controller |