JPS6428018U - - Google Patents
Info
- Publication number
- JPS6428018U JPS6428018U JP12245187U JP12245187U JPS6428018U JP S6428018 U JPS6428018 U JP S6428018U JP 12245187 U JP12245187 U JP 12245187U JP 12245187 U JP12245187 U JP 12245187U JP S6428018 U JPS6428018 U JP S6428018U
- Authority
- JP
- Japan
- Prior art keywords
- coupling capacitor
- pass filter
- coil
- series
- variable attenuation
- 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
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Filters And Equalizers (AREA)
- Attenuators (AREA)
Description
第１図は、本考案の可変減衰回路の一実施例の
回路図であり、第２図は、本考案の可変減衰回路
の他の一実施例の回路図であり、第３図は、ＣＡ
ＴＶにおけるビデオ信号復元装置の一例のブロツ
ク回路図であり、第４図は、従来の可変減衰回路
の一例の回路図を示し、第５図は、第４図の回路
において減衰量の切り換えの際に雑音パルスが生
じることを説明する波形図である。
１１，１１′，２６，２６′，２６″：結合コ
ンデンサ、１２，２５，２５′：チヨークコイル
、１３，１４，１５，１８，２１，２４：スイツ
チ用ダイオード、１６，１７，１９，２０，２２
，２３，２８，３０，３２：抵抗、２７：出力端
子、４０，４１，４７：ハイパスフイルタ、４２
，４４：コンデンサ、４３，４５，４６：コイル
。
FIG. 1 is a circuit diagram of one embodiment of the variable attenuation circuit of the present invention, FIG. 2 is a circuit diagram of another embodiment of the variable attenuation circuit of the present invention, and FIG. 3 is a circuit diagram of another embodiment of the variable attenuation circuit of the present invention.
4 is a block circuit diagram of an example of a video signal restoration device for a TV; FIG. 4 is a circuit diagram of an example of a conventional variable attenuation circuit; FIG. 5 is a block circuit diagram of an example of a conventional variable attenuation circuit; FIG. FIG. 3 is a waveform diagram illustrating that a noise pulse is generated in the waveform. 11, 11', 26, 26', 26'': Coupling capacitor, 12, 25, 25': York coil, 13, 14, 15, 18, 21, 24: Switch diode, 16, 17, 19, 20, 22
, 23, 28, 30, 32: Resistor, 27: Output terminal, 40, 41, 47: High pass filter, 42
, 44: Capacitor, 43, 45, 46: Coil.
Claims (1)
御されるスイツチ用ダイオードと抵抗の直列接続
体を並列接続し、この並列接続体の両端を直流接
地用のチヨークコイルを介してそれぞれ接地する
とともに直流阻止用の結合コンデンサを直列にそ
れぞれ接続し、さらに出力端子側に前記結合コン
デンサとこの結合コンデンサの出力側と接地間に
介装されるコイルとを含んで形成されるハイパス
フイルタを設けたことを特徴とする可変減衰回路
。 (2) 前記ハイパスフイルタは、前記結合コンデ
ンサとコイルと前記結合コンデンサの出力側に直
列接続される別のコンデンサとからなるＴ型ハイ
パスフイルタであることを特徴とする実用新案登
録請求の範囲第１項記載の可変減衰回路。[Claims for Utility Model Registration] (1) A series connection body consisting of a switch diode and a resistor that are ON/OFF controlled to switch the attenuation amount is connected in parallel, and both ends of this parallel connection body are connected to a DC grounding coil. A coupling capacitor for DC blocking is connected in series, and the output terminal side includes the coupling capacitor and a coil interposed between the output side of the coupling capacitor and the ground. A variable attenuation circuit characterized by being provided with a high-pass filter. (2) Utility model registration claim 1, characterized in that the high-pass filter is a T-type high-pass filter consisting of the coupling capacitor, a coil, and another capacitor connected in series to the output side of the coupling capacitor. Variable attenuation circuit as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12245187U JPS6428018U (en) | 1987-08-10 | 1987-08-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12245187U JPS6428018U (en) | 1987-08-10 | 1987-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6428018U true JPS6428018U (en) | 1989-02-17 |
Family
ID=31370397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12245187U Pending JPS6428018U (en) | 1987-08-10 | 1987-08-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6428018U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009201034A (en) * | 2008-02-25 | 2009-09-03 | Mitsubishi Electric Corp | Filter circuit |
-
1987
- 1987-08-10 JP JP12245187U patent/JPS6428018U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009201034A (en) * | 2008-02-25 | 2009-09-03 | Mitsubishi Electric Corp | Filter circuit |
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