JPS5873654U - AM receiver noise suppression circuit - Google Patents
AM receiver noise suppression circuitInfo
- Publication number
- JPS5873654U JPS5873654U JP16899481U JP16899481U JPS5873654U JP S5873654 U JPS5873654 U JP S5873654U JP 16899481 U JP16899481 U JP 16899481U JP 16899481 U JP16899481 U JP 16899481U JP S5873654 U JPS5873654 U JP S5873654U
- Authority
- JP
- Japan
- Prior art keywords
- noise suppression
- suppression circuit
- cut filter
- signal line
- series
- 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
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Noise Elimination (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は、本考案による雑音抑制回路を含むＡＭ受信器
の１部を示す回路図、第２図は、電界強度検出回路９よ
り出力される制御電圧の変化特性を示すグラフ、第３図
は、第１図の雑音抑制回路の周波数特性を示すグラフで
ある。FIG. 1 is a circuit diagram showing a part of an AM receiver including a noise suppression circuit according to the present invention, FIG. 2 is a graph showing the change characteristics of the control voltage output from the field strength detection circuit 9, and FIG. 2 is a graph showing the frequency characteristics of the noise suppression circuit of FIG. 1. FIG.
Claims (4)
オーディオ信号帯域における高域成分を減衰させる高域
カットフィルタと、前記入力信号レベルに応じて減衰特
性を変化させつつ前記オーディオ信号帯域における低域
成分を減衰させる低域カットフィルタとを含むことを特
徴とする雑音抑制回路。(1) A high-frequency cut filter that attenuates high-frequency components in the audio signal band while changing the attenuation characteristic according to the input signal level; 1. A noise suppression circuit comprising: a low-frequency cut filter that attenuates frequency components.
第′１の抵抗と、信号ラインに並列な第１のコンデンサ
と第１の可変導電性素子との直列回路とからなり、前記
第１の可変導電性素子は前記入力信号レベルに応じてそ
の導電性が変化することを特徴とする実用新案登録請求
の範囲第１項記載の雑音抑制回路。(2) The high-frequency cut filter is comprised of a series circuit including a '1st resistor in series with the signal line, a first capacitor in parallel with the signal line, and a first variable conductive element; 2. The noise suppression circuit according to claim 1, wherein the variable conductivity element changes its conductivity depending on the input signal level.
第２のコンデンサと、信号ラインに並列な第２の抵抗と
第２の可変導電性素子との直列回路とからなり、前記第
２の可変導電性素子は前記入力信号レベルに応じてその
導電性が変化することを特徴とする実用新案登録請求の
範囲第１項記載の雑音抑制回路。(3) The low-pass cut filter includes a second capacitor in series with the signal line, a series circuit of a second resistor and a second variable conductive element in parallel with the signal line, and 2. The noise suppression circuit according to claim 1, wherein the variable conductive element changes its conductivity depending on the input signal level.
タであり、前記トランジスタのベースに受信電界強度に
応じた電圧が供給されるようなされたことを特徴とする
実用新案登録請求の範囲第２項または第３項記載の雑音
抑制回路。(4) The first and second variable conductive elements are transistors, and the base of the transistor is supplied with a voltage according to the received electric field strength. The noise suppression circuit according to item 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16899481U JPS5873654U (en) | 1981-11-13 | 1981-11-13 | AM receiver noise suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16899481U JPS5873654U (en) | 1981-11-13 | 1981-11-13 | AM receiver noise suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5873654U true JPS5873654U (en) | 1983-05-18 |
Family
ID=29961000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16899481U Pending JPS5873654U (en) | 1981-11-13 | 1981-11-13 | AM receiver noise suppression circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5873654U (en) |
-
1981
- 1981-11-13 JP JP16899481U patent/JPS5873654U/en active Pending
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