JPH045737U - - Google Patents
Info
- Publication number
- JPH045737U JPH045737U JP4544990U JP4544990U JPH045737U JP H045737 U JPH045737 U JP H045737U JP 4544990 U JP4544990 U JP 4544990U JP 4544990 U JP4544990 U JP 4544990U JP H045737 U JPH045737 U JP H045737U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- filter
- fsk
- fsk signal
- receiving circuit
- 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
- 230000002159 abnormal effect Effects 0.000 claims 2
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Description
第１図は本考案の一実施例としての構成を示す
回路図、第２図は第１図の各部の信号波形図、第
３図は第１図に対応する従来の回路図、第４図は
第３図の各部の信号波形図、第５図はアクテイブ
フイルタのインパルス性ノイズに対する応答特性
の説明図である。
１……ハイパスフイルタ、２，２Ｌ，２Ｈ……
アクテイブフイルタ、４……ＦＳＫ信号判別回路
、５……ＣＰＵ、６……コンデンサ、７，８……
ダイオード、９，１１，１２，１４，１５，１７
……抵抗、１０……コンパレータ、１３……可変
抵抗、１６……トランジスタ。
Fig. 1 is a circuit diagram showing a configuration as an embodiment of the present invention, Fig. 2 is a signal waveform diagram of each part of Fig. 1, Fig. 3 is a conventional circuit diagram corresponding to Fig. 1, and Fig. 4 3 is a signal waveform diagram of each part in FIG. 3, and FIG. 5 is an explanatory diagram of the response characteristic of the active filter to impulsive noise. 1...High pass filter, 2, 2L, 2H...
Active filter, 4...FSK signal discrimination circuit, 5...CPU, 6...Capacitor, 7, 8...
Diode, 9, 11, 12, 14, 15, 17
...Resistor, 10...Comparator, 13...Variable resistor, 16...Transistor.
Claims (1)
商用周波数を取除く第１フイルタと、このフイル
タの出力信号から前記ＦＳＫ信号を抽出し出力す
る第２のフイルタとを備えたＦＳＫ信号受信回路
において、 前記第２のフイルタの出力信号中の前記ＦＳＫ
信号のレベルを越える電圧の存在を検出し、該電
圧の存在の間、異常信号を出力する手段と、 前記異常信号に応答して前記第２のフイルタの
入力信号を短絡する手段とを備えたことを特徴と
するＦＳＫ信号受信回路のノイズ除去装置。[Claims for Utility Model Registration] A first filter that removes the commercial frequency from a superimposed signal of the FSK signal and the commercial frequency, and a second filter that extracts and outputs the FSK signal from the output signal of this filter. In the FSK signal receiving circuit, the FSK signal in the output signal of the second filter is
means for detecting the presence of a voltage exceeding the level of the signal and outputting an abnormal signal during the presence of the voltage; and means for short-circuiting the input signal of the second filter in response to the abnormal signal. A noise removal device for an FSK signal receiving circuit, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4544990U JPH045737U (en) | 1990-04-27 | 1990-04-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4544990U JPH045737U (en) | 1990-04-27 | 1990-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH045737U true JPH045737U (en) | 1992-01-20 |
Family
ID=31559636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4544990U Pending JPH045737U (en) | 1990-04-27 | 1990-04-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH045737U (en) |
-
1990
- 1990-04-27 JP JP4544990U patent/JPH045737U/ja active Pending
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