JPS6365380U - - Google Patents
Info
- Publication number
- JPS6365380U JPS6365380U JP16076886U JP16076886U JPS6365380U JP S6365380 U JPS6365380 U JP S6365380U JP 16076886 U JP16076886 U JP 16076886U JP 16076886 U JP16076886 U JP 16076886U JP S6365380 U JPS6365380 U JP S6365380U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- scrambled
- terminal device
- key pulse
- bandpass filter
- 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
- 230000010355 oscillation Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は、本考案のＣＡＴＶ放送の端末装置の
一実施例の回路図であり、第２図は、従来のＣＡ
ＴＶ放送の端末装置の一例のブロツク回路図であ
る。
５：テレビ受像機、７：デスクランブラ回路、
８：キーパルス復調回路、９：ドライバー回路、
２０：端末装置、２２：バンドパスフイルタ、２
３：動作制御回路。
FIG. 1 is a circuit diagram of an embodiment of the CATV broadcasting terminal device of the present invention, and FIG. 2 is a circuit diagram of a conventional CATV broadcasting terminal device.
1 is a block circuit diagram of an example of a terminal device for TV broadcasting; FIG. 5: TV receiver, 7: Descrambler circuit,
8: Key pulse demodulation circuit, 9: Driver circuit,
20: Terminal device, 22: Bandpass filter, 2
3: Operation control circuit.
Claims (1)
含む多チヤンネルのＣＡＴＶ放送信号を２つに分
岐し、一方をデスクランブラ回路に与え、他方を
キーパルス復調回路に与え、このキーパルス復調
回路で前記スクランブルされた信号に重畳された
キーパルスを復調し、このキーパルスの復調信号
に応じてドライバー回路で前記デスクランブラ回
路を制御して前記スクランブルされた信号をデス
クランブルして出力するＣＡＴＶ放送の端末装置
において、この端末装置の出力が与えられるテレ
ビ受像機から漏れて逆流する局部発振信号をバン
ドパススフイルタに与え、このバンドパスフイル
タを受信契約がなされたテレビチヤンネルの選局
による局部発振信号のみが通過するよう設定し、
前記バンドパスフイルタを通過する局部発振信号
の存在によつて前記ドライバー回路を動作状態と
することを特徴としたＣＡＴＶ放送の端末装置。 A multi-channel CATV broadcast signal containing scrambled TV channel signals is branched into two, one is given to a descrambler circuit, the other is given to a key pulse demodulation circuit, and the key pulse demodulation circuit superimposes it on the scrambled signal. In a CATV broadcasting terminal device that demodulates the scrambled key pulse, controls the descrambler circuit with a driver circuit according to the demodulated signal of the key pulse, and descrambles and outputs the scrambled signal, the output of the terminal device is A local oscillation signal that leaks and flows backward from a television receiver to which a reception is applied is applied to a bandpass filter, and this bandpass filter is set so that only the local oscillation signal from the selected television channel with which the reception contract has been made passes through.
A terminal device for CATV broadcasting, characterized in that the driver circuit is activated by the presence of a local oscillation signal passing through the bandpass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16076886U JPS6365380U (en) | 1986-10-20 | 1986-10-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16076886U JPS6365380U (en) | 1986-10-20 | 1986-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6365380U true JPS6365380U (en) | 1988-04-30 |
Family
ID=31086457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16076886U Pending JPS6365380U (en) | 1986-10-20 | 1986-10-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6365380U (en) |
-
1986
- 1986-10-20 JP JP16076886U patent/JPS6365380U/ja active Pending
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