JPS619979U - CATV converter - Google Patents
CATV converterInfo
- Publication number
- JPS619979U JPS619979U JP1984091672U JP9167284U JPS619979U JP S619979 U JPS619979 U JP S619979U JP 1984091672 U JP1984091672 U JP 1984091672U JP 9167284 U JP9167284 U JP 9167284U JP S619979 U JPS619979 U JP S619979U
- Authority
- JP
- Japan
- Prior art keywords
- catv
- signal
- standard television
- input terminal
- television 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.)
- Granted
Links
Landscapes
- Details Of Television Systems (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案の実施例の要部回路図、第２図は本考案
の実施例の局部発振器の発振周波数と受信周波数との関
係説明図、第３図は従来のＣＡＴＶコンバータのブロッ
ク図、第４図は標準テレビ信号とＣＡＴＶ信号との周波
数配置説明図、第５図は従来の１局部発振器の要部回路
図、第６図は従来の局部発振の発振周波数と受信周波数
との関係説明図である。
１は入力端子、２，１０．２４は切換スイッチ、３は入
力フィルタ、４は第１ミキサ、５は第１局部発振器、６
はバッドパスフィルタ、７は第２ミキサ、８は第２局部
発振器、９は出力フィルタ、１１は出力端子、２１は可
変容量ダイオード、２２は発振素子、２３は同調電圧印
加用の端子、２５は所定電圧印加用の端子である。Fig. 1 is a circuit diagram of the main part of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the relationship between the oscillation frequency of the local oscillator and the reception frequency of the embodiment of the present invention, and Fig. 3 is a block diagram of a conventional CATV converter. , Figure 4 is an explanatory diagram of the frequency allocation of standard TV signals and CATV signals, Figure 5 is a circuit diagram of the main part of a conventional single local oscillator, and Figure 6 is the relationship between the oscillation frequency and reception frequency of the conventional local oscillator. It is an explanatory diagram. 1 is an input terminal, 2, 10.24 is a changeover switch, 3 is an input filter, 4 is a first mixer, 5 is a first local oscillator, 6
is a bad pass filter, 7 is a second mixer, 8 is a second local oscillator, 9 is an output filter, 11 is an output terminal, 21 is a variable capacitance diode, 22 is an oscillation element, 23 is a terminal for applying tuning voltage, 25 is a This is a terminal for applying a predetermined voltage.
Claims (1)
れ、前記ＣＡＴＶ信号を所定のチャネルの標準テレビ信
号に変換するＣＡＴＶコンバータに於いて、前記入力端
子に加えられた標準テレビ信号を出力端子に直接的に出
力するバイパス線路と、局部発振器と、該局部発振器の
局部発振周波数の設定によって前記ＣＡＴＶ信号を前記
所定のチャネルの標準テレビ信号に変換する周波数変換
器と、前記入力端子と前記出力端子とを前記バイパス線
路又は前記周波数変換器との何れかに切換接続する切換
スイッチとを備え、前記標準テレビ信号受信時には、前
記入力端子と出力端子とを前記バイパス線路に前記切換
スイッチにより接続すると共に、該切換スイッチに連動
して前記局部発振器の発振周波数を前記ＣＡＴＶ信号を
受信不能な範囲まで高くする切換手段を設けたことを特
徴とするＣＡＴＶコンバータA standard television signal and a CATV signal are input to the input terminal, and in a CATV converter that converts the CATV signal into a standard television signal of a predetermined channel, the standard television signal applied to the input terminal is directly input to the output terminal. a bypass line that outputs a signal, a local oscillator, a frequency converter that converts the CATV signal into a standard television signal of the predetermined channel by setting a local oscillation frequency of the local oscillator, the input terminal and the output terminal; a changeover switch for selectively connecting the input terminal to either the bypass line or the frequency converter, and when receiving the standard television signal, the input terminal and the output terminal are connected to the bypass line by the changeover switch, A CATV converter characterized in that a switching means is provided for increasing the oscillation frequency of the local oscillator to a range in which the CATV signal cannot be received in conjunction with the changeover switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984091672U JPS619979U (en) | 1984-06-21 | 1984-06-21 | CATV converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984091672U JPS619979U (en) | 1984-06-21 | 1984-06-21 | CATV converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS619979U true JPS619979U (en) | 1986-01-21 |
| JPH0215426Y2 JPH0215426Y2 (en) | 1990-04-25 |
Family
ID=30647771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984091672U Granted JPS619979U (en) | 1984-06-21 | 1984-06-21 | CATV converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS619979U (en) |
-
1984
- 1984-06-21 JP JP1984091672U patent/JPS619979U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0215426Y2 (en) | 1990-04-25 |
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