JPH0457979U - - Google Patents
Info
- Publication number
- JPH0457979U JPH0457979U JP10142990U JP10142990U JPH0457979U JP H0457979 U JPH0457979 U JP H0457979U JP 10142990 U JP10142990 U JP 10142990U JP 10142990 U JP10142990 U JP 10142990U JP H0457979 U JPH0457979 U JP H0457979U
- Authority
- JP
- Japan
- Prior art keywords
- emitter
- signal
- coil
- reference potential
- specific frequency
- 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 3
- 238000010586 diagram Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
- Networks Using Active Elements (AREA)
Description
第１図は本考案の一実施例のノツチフイルタを
示す回路図、第２図は第１図のフイルタの振幅周
波数特性を示す特性図、第３図は第１図のフイル
タに入力される負極性輝度信号を示す波形図、第
４図は従来のノツチフイルタを示す回路図、第５
図は第４図のフイルタの振幅周波数特性を示す特
性図である。
１……入力端子、４……出力端子、４……コイ
ル、５……コンデンサ、６……ダンピング抵抗、
７……電源端子、８……エミツタフオロア用トラ
ンジスタ、９……エミツタ抵抗。
Fig. 1 is a circuit diagram showing a notch filter according to an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the amplitude frequency characteristics of the filter shown in Fig. 1, and Fig. 3 shows the negative polarity input to the filter shown in Fig. 1. Figure 4 is a waveform diagram showing a luminance signal, Figure 4 is a circuit diagram showing a conventional notch filter, Figure 5 is a circuit diagram showing a conventional notch filter.
The figure is a characteristic diagram showing the amplitude frequency characteristic of the filter of FIG. 4. 1... Input terminal, 4... Output terminal, 4... Coil, 5... Capacitor, 6... Damping resistor,
7...Power supply terminal, 8...Emitter follower transistor, 9...Emitter resistor.
Claims (1)
る交流信号が供給され、コレクタは直流電源に接
続され、エミツタはエミツタ抵抗を介して基準電
位点に接続されたトランジスタで構成されるエミ
ツタフオロア回路と、 このエミツタフオロア回路のエミツタと基準電
位点間に接続され、特定周波数に共振点を持つコ
イルとコンデンサから成る直列共振回路を含むト
ラツプであつて、前記エミツタとの接続点に、前
記特定周波数付近の交流信号振幅の負極側成分の
みを抑圧した交流信号を得るためのトラツプと を具備したことを特徴とするノツチフイルタ。[Claims for Utility Model Registration] As an input, an AC signal having a predetermined DC level is supplied to the base, the collector is connected to a DC power supply, and the emitter is composed of a transistor connected to a reference potential point via an emitter resistor. A trap including an emitter follower circuit, and a series resonant circuit consisting of a coil and a capacitor connected between the emitter of this emitter follower circuit and a reference potential point, and consisting of a coil and a capacitor having a resonance point at a specific frequency, and at a connection point with the emitter, A notch filter comprising: a trap for obtaining an AC signal in which only the negative polarity side component of the AC signal amplitude near the specific frequency is suppressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10142990U JPH0457979U (en) | 1990-09-26 | 1990-09-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10142990U JPH0457979U (en) | 1990-09-26 | 1990-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0457979U true JPH0457979U (en) | 1992-05-19 |
Family
ID=31844870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10142990U Pending JPH0457979U (en) | 1990-09-26 | 1990-09-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0457979U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995004401A1 (en) * | 1993-07-27 | 1995-02-09 | Fujitsu Limited | Filter circuit |
-
1990
- 1990-09-26 JP JP10142990U patent/JPH0457979U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995004401A1 (en) * | 1993-07-27 | 1995-02-09 | Fujitsu Limited | Filter circuit |
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