JPH0410436U - - Google Patents
Info
- Publication number
- JPH0410436U JPH0410436U JP5125890U JP5125890U JPH0410436U JP H0410436 U JPH0410436 U JP H0410436U JP 5125890 U JP5125890 U JP 5125890U JP 5125890 U JP5125890 U JP 5125890U JP H0410436 U JPH0410436 U JP H0410436U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- noise
- output signal
- switching
- buffer
- 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
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
Landscapes
- Noise Elimination (AREA)
Description
第１図乃至第３図はこの考案に係るＦＭ受信機
のノイズキヤンセラ回路の実施例を示し、第１図
はブロツク図、第２図はノイズキヤンセラ制御部
の回路図、第３図は各部の信号波形を示したタイ
ミングチヤートであり、第３図Ａはアンテナ端子
の入力信号波形図、第３図ＢはＩＦ増幅検波回路
のＳメータ出力信号波形図、第３図Ｃはノイズキ
ヤンセラ制御部の第１のバツフア回路の出力信号
波形図、第３図Ｄは第２のバツフア回路の出力信
号波形図、第３図Ｅはスイツチング回路の入力信
号波形図、第３図Ｆはノイズ増幅回路の出力端子
の信号波形図である。第４図は従来例を示したブ
ロツク図である。
主な符号の説明、３ａ……ＩＦ増幅検波回路の
検波出力端子、３ｂ……ＩＦ増幅検波回路のＳメ
ータ出力端子、４……ノイズキヤンセラ回路、９
ａ……ノイズ増幅回路の出力端子、１１……ノイ
ズキヤンセラ制御部。
1 to 3 show an embodiment of the noise canceler circuit of the FM receiver according to this invention, FIG. 1 is a block diagram, FIG. 2 is a circuit diagram of the noise canceler control section, and FIG. 3 is a circuit diagram of the noise canceller control section. These are timing charts showing the signal waveforms of each part. Figure 3A is the input signal waveform diagram of the antenna terminal, Figure 3B is the S meter output signal waveform diagram of the IF amplification and detection circuit, and Figure 3C is the noise canceller. Figure 3D is an output signal waveform diagram of the first buffer circuit of the control section, Figure 3D is an output signal waveform diagram of the second buffer circuit, Figure 3E is an input signal waveform diagram of the switching circuit, and Figure 3F is noise amplification. FIG. 3 is a signal waveform diagram of the output terminal of the circuit. FIG. 4 is a block diagram showing a conventional example. Explanation of main symbols, 3a...Detection output terminal of IF amplification and detection circuit, 3b...S meter output terminal of IF amplification and detection circuit, 4...Noise canceller circuit, 9
a...Output terminal of the noise amplification circuit, 11...Noise canceller control unit.
Claims (1)
の抽出したノイズレベルに応じてノイズ増幅回路
のゲインを制御し、ＦＭ受信信号のノイズキヤン
セラ動作をするＦＭ受信機のノイズキヤンセラ回
路において、 ＦＭ検波出力のＳメータ出力信号の第１のバツ
フア回路と、Ｓメータ出力信号の正負信号成分を
スイツチするスイツチ回路、このスイツチ回路出
力信号の第２のバツフア回路と、上記第１及び第
２のバツフア回路の出力差でスイツチングするス
イツチング回路とを設け、上記ノイズ増幅回路の
ゲイン制御の帰還量をスイツチング回路によつて
制御するよう構成したことを特徴とするＦＭ受信
機のノイズキヤンセラ回路。[Claims for Utility Model Registration] An FM receiver that extracts a noise component from an FM detection output signal, controls the gain of a noise amplification circuit according to the extracted noise level, and operates as a noise canceler for an FM received signal. The noise canceler circuit includes a first buffer circuit for the S meter output signal of the FM detection output, a switch circuit for switching the positive and negative signal components of the S meter output signal, a second buffer circuit for the output signal of this switch circuit, and the above-mentioned. A switching circuit that performs switching based on the output difference between the first and second buffer circuits is provided, and the feedback amount of the gain control of the noise amplification circuit is controlled by the switching circuit. Noise canceller circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5125890U JPH0410436U (en) | 1990-05-18 | 1990-05-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5125890U JPH0410436U (en) | 1990-05-18 | 1990-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0410436U true JPH0410436U (en) | 1992-01-29 |
Family
ID=31570533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5125890U Pending JPH0410436U (en) | 1990-05-18 | 1990-05-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0410436U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6487908A (en) * | 1987-04-03 | 1989-04-03 | Babcock & Wilcox Co | Flexible shaft |
-
1990
- 1990-05-18 JP JP5125890U patent/JPH0410436U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6487908A (en) * | 1987-04-03 | 1989-04-03 | Babcock & Wilcox Co | Flexible shaft |
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