JPH0358045U - - Google Patents
Info
- Publication number
- JPH0358045U JPH0358045U JP11939389U JP11939389U JPH0358045U JP H0358045 U JPH0358045 U JP H0358045U JP 11939389 U JP11939389 U JP 11939389U JP 11939389 U JP11939389 U JP 11939389U JP H0358045 U JPH0358045 U JP H0358045U
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- frequency signal
- adjacent
- output stage
- 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 2
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Superheterodyne Receivers (AREA)
Description
第１図はこの考案の一実施例の構成を示すブロ
ツク図、第２図はＣＡＴＶシステムの各チヤンネ
ルの周波数割り当てを説明するための図、第３図
は従来のＣＡＴＶコンバータの構成を示すブロツ
ク図、第４図は従来のＣＡＴＶコンバータのチユ
ーナ部とトラツプ回路の周波数特性を説明するた
めの図である。
２……チユーナ部、５……分岐器、７……狭帯
域バンドパスフイルタ、８……増幅回路、９……
ダイオード、１０……比較器、１１……ダイオー
ドスイツチ。
Fig. 1 is a block diagram showing the configuration of an embodiment of this invention, Fig. 2 is a diagram for explaining the frequency allocation of each channel of the CATV system, and Fig. 3 is a block diagram showing the configuration of a conventional CATV converter. , FIG. 4 is a diagram for explaining the frequency characteristics of a tuner section and a trap circuit of a conventional CATV converter. 2... Tuner section, 5... Brancher, 7... Narrowband band pass filter, 8... Amplifier circuit, 9...
Diode, 10... comparator, 11... diode switch.
Claims (1)
を入力して、任意の受信チヤンネルの映像中間周
波信号および音声中間周波信号を選択して出力す
るチユーナ部と、 前記チユーナ部から出力され、前記受信チヤン
ネルの映像中間周波信号に隣接する隣接チヤンネ
ルの隣接音声中間周波信号の信号強度を検出する
検出回路と、 前記隣接音声中間周波信号を減衰させるトラツ
プ回路と、 前記検出回路で検出された信号強度が所定値以
上の場合に前記トラツプ回路を前記チユーナ部の
出力段に接続し、前記検出回路で検出された信号
強度が所定値未満の場合には、前記トラツプ回路
を前記チユーナ部の出力段から切り離すスイツチ
手段と、 を具備することを特徴とするＣＡＴＶコンバータ
。[Claims for Utility Model Registration] A tuner unit that inputs a television signal supplied via a cable and selects and outputs a video intermediate frequency signal and an audio intermediate frequency signal of an arbitrary reception channel; and the tuner unit a detection circuit that detects the signal strength of an adjacent audio intermediate frequency signal of an adjacent channel outputted from the video intermediate frequency signal of the receiving channel and adjacent to the video intermediate frequency signal of the receiving channel; a trap circuit that attenuates the adjacent audio intermediate frequency signal; When the detected signal strength is above a predetermined value, the trap circuit is connected to the output stage of the tuner section, and when the signal strength detected by the detection circuit is less than the predetermined value, the trap circuit is connected to the output stage of the tuner section. A CATV converter characterized by comprising: a switch means for disconnecting from the output stage of the section;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11939389U JPH0358045U (en) | 1989-10-12 | 1989-10-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11939389U JPH0358045U (en) | 1989-10-12 | 1989-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0358045U true JPH0358045U (en) | 1991-06-05 |
Family
ID=31667519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11939389U Pending JPH0358045U (en) | 1989-10-12 | 1989-10-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0358045U (en) |
-
1989
- 1989-10-12 JP JP11939389U patent/JPH0358045U/ja active Pending
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