JPS5868748U - AM receiver - Google Patents
AM receiverInfo
- Publication number
- JPS5868748U JPS5868748U JP16259381U JP16259381U JPS5868748U JP S5868748 U JPS5868748 U JP S5868748U JP 16259381 U JP16259381 U JP 16259381U JP 16259381 U JP16259381 U JP 16259381U JP S5868748 U JPS5868748 U JP S5868748U
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- filter
- circuit
- receiver
- beat
- 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
- 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) [Abstract] 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ＡＭ受信機の一実施例を示すブロ
ック図、第２図ａ及びｂは希望波と隣接妨害波とのスペ
クトル図及びベクトル図、並びに第３図は第１図の回路
の動作を説明するためのスペクトル図である。
６・・・広帯域中間周波セラミックフィルタ、７・・・
狭帯域中間周波セラミックフィルタ、８・・・電子スイ
ッチ、９・・・電界強度検出回路、１０ａ・・・増幅・
検波回路、１０ｂ・・・ＰＬＬ回路、１１・・・オアゲ
ート。FIG. 1 is a block diagram showing an embodiment of an AM receiver according to the present invention, FIGS. 2a and b are spectrum diagrams and vector diagrams of a desired wave and adjacent interfering waves, and FIG. FIG. 2 is a spectrum diagram for explaining the operation of FIG. 6...Broadband intermediate frequency ceramic filter, 7...
Narrow band intermediate frequency ceramic filter, 8... Electronic switch, 9... Electric field strength detection circuit, 10a... Amplification.
Detection circuit, 10b...PLL circuit, 11...OR gate.
Claims (1)
有し、これらのフィルタの一芳を中間周波段に選択的に
挿入するようにしたＡＭ受信機において、周波数変換段
の出力を包路線検波する回路と、ビート周波数付近で発
振されるようにした電圧制御発振器を有するフェーズロ
ックループ回路とからなり、前記検波回路の出力信号に
よるフェーズロックループ回路のロックによりビート検
出を行うビート検出回路と、同調局の電界強度を検出す
る電界強度検出回路とを具備し、前記ビート検出回路に
よるビート検出又は前記電界強度検出回路による所定値
以下の電界強度の検出、若しくはこれら両方の検出に応
じて、前記狭帯域フィルタを中間周波数段に挿入し、そ
れ以外のとき前記広帯域フィルタを挿入するようにした
ＡＭ受信機。A circuit for envelope detection of the output of a frequency conversion stage in an AM receiver having a wideband intermediate frequency filter and a narrowband intermediate frequency filter, and in which one of these filters is selectively inserted into the intermediate frequency stage. and a phase-locked loop circuit having a voltage-controlled oscillator that oscillates around the beat frequency, a beat detection circuit that performs beat detection by locking the phase-locked loop circuit with the output signal of the detection circuit, and a tuning station. an electric field strength detection circuit that detects an electric field strength of An AM receiver in which a filter is inserted in an intermediate frequency stage, and the wideband filter is inserted in other cases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16259381U JPS5868748U (en) | 1981-11-02 | 1981-11-02 | AM receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16259381U JPS5868748U (en) | 1981-11-02 | 1981-11-02 | AM receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5868748U true JPS5868748U (en) | 1983-05-10 |
Family
ID=29954902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16259381U Pending JPS5868748U (en) | 1981-11-02 | 1981-11-02 | AM receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5868748U (en) |
-
1981
- 1981-11-02 JP JP16259381U patent/JPS5868748U/en active Pending
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