JPS63178930U - - Google Patents
Info
- Publication number
- JPS63178930U JPS63178930U JP6938487U JP6938487U JPS63178930U JP S63178930 U JPS63178930 U JP S63178930U JP 6938487 U JP6938487 U JP 6938487U JP 6938487 U JP6938487 U JP 6938487U JP S63178930 U JPS63178930 U JP S63178930U
- Authority
- JP
- Japan
- Prior art keywords
- intermediate frequency
- signal
- amplification circuit
- frequency
- frequency amplification
- 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.)
- Granted
Links
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 2
- 230000007423 decrease Effects 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
Description
第１図はこの考案の一実施例の構成を示すブロ
ツク図、第２図は同実施例において隣接局妨害を
検出する際の動作を説明するためのフローチヤー
ト、第３図は同実施例における狭帯域バンドパス
フイルタ１３の通過帯域特性を説明するためのグ
ラフである。
１……アンテナ、７……ＦＭフロントエンド、
８……アナログスイツチ、９……ＦＭ中間周波増
幅回路、１３……狭帯域バンドパスフイルタ、２
３……ＡＭ高周波増幅回路、２６……周波数変換
回路、２７……ＡＭフロントエンド、２８……帯
域切換回路、２９……ＡＭ中間周波増幅回路、３
２……信号強度検出回路、３４……ＰＬＬ回路、
３６……周波数変換回路、３７……局部発振器、
３８……混合器、３９……ＰＬＬ回路、４３……
Ａ／Ｄ変換器、４９……コントローラ（制御手段
）。
FIG. 1 is a block diagram showing the configuration of one embodiment of this invention, FIG. 2 is a flowchart for explaining the operation when detecting adjacent station interference in the same embodiment, and FIG. 3 is a flowchart in the same embodiment. 3 is a graph for explaining the passband characteristics of the narrowband bandpass filter 13. FIG. 1...Antenna, 7...FM front end,
8...Analog switch, 9...FM intermediate frequency amplification circuit, 13...Narrowband bandpass filter, 2
3...AM high frequency amplification circuit, 26...Frequency conversion circuit, 27...AM front end, 28...Band switching circuit, 29...AM intermediate frequency amplification circuit, 3
2... Signal strength detection circuit, 34... PLL circuit,
36... Frequency conversion circuit, 37... Local oscillator,
38...Mixer, 39...PLL circuit, 43...
A/D converter, 49...controller (control means).
Claims (1)
Ｍ高周波増幅回路とこのＡＭ高周波増幅回路で増
幅されたＡＭ受信信号をＡＭ中間周波信号に変換
する周波数変換回路とからなるＡＭフロントエン
ドと、 前記ＡＭ中間周波信号を増幅するＡＭ中間周波
増幅回路と、 アンテナで受信したＦＭ受信信号を増幅し、Ｆ
Ｍ中間周波信号に変換して出力するＦＭフロント
エンドと、 前記ＦＭ中間周波信号を増幅するＦＭ中間周波
増幅回路とを具備するＦＭ／ＡＭ受信機において
、 前記ＡＭ中間周波信号の周波数を中心周波数と
し、かつ隣接局妨害を排除するのに必要な所要通
過帯域特性を有する狭帯域バンドパスフイルタと
、 切換信号に応じて前記狭帯域バンドパスフイル
タを前記ＡＭフロントエンドとＡＭ中間周波増幅
回路との間に接続する帯域切換手段と、 設定値に応じた周波数を発振する発振手段と、 前記発振手段の発振出力に前記ＡＭ高周波増幅
回路から出力されるＡＭ受信信号を混合し、これ
により得られたＦＭ中間周波数の信号を前記ＦＭ
中間周波増幅回路に供給する混合手段と、 前記ＦＭ中間周波増幅回路から出力される中間
周波信号に基づいて、信号強度を検出する信号強
度検出手段と、 前記設定値を増減することにより、前記発振手
段の発振周波数を所定幅で増減し、この設定値の
増減に伴つて前記信号強度検出手段から得られる
信号の変化を相互に比較することにより、隣接局
妨害の有無を判別し、この判別結果に基づいて前
記帯域切換手段を切換制御する制御手段と、 を具備することを特徴とするＦＭ／ＡＭ受信機
。[Claims for Utility Model Registration] A for amplifying AM reception signals received by an antenna
an AM front end consisting of an M high frequency amplification circuit and a frequency conversion circuit that converts an AM reception signal amplified by the AM high frequency amplification circuit into an AM intermediate frequency signal; an AM intermediate frequency amplification circuit that amplifies the AM intermediate frequency signal; , amplify the FM reception signal received by the antenna, and
An FM/AM receiver comprising an FM front end that converts into an M intermediate frequency signal and outputs it, and an FM intermediate frequency amplification circuit that amplifies the FM intermediate frequency signal, wherein the frequency of the AM intermediate frequency signal is set as a center frequency. , and a narrowband bandpass filter having the required passband characteristics necessary to eliminate adjacent station interference; and in response to a switching signal, the narrowband bandpass filter is connected between the AM front end and the AM intermediate frequency amplification circuit. an oscillating means that oscillates a frequency according to a set value; an oscillating means that mixes the oscillation output of the oscillating means with an AM reception signal output from the AM high-frequency amplifier circuit, and an FM signal obtained by this; The intermediate frequency signal is transmitted to the FM
mixing means for supplying to an intermediate frequency amplification circuit; signal strength detection means for detecting signal strength based on the intermediate frequency signal output from the FM intermediate frequency amplification circuit; The presence or absence of adjacent station interference is determined by increasing or decreasing the oscillation frequency of the means in a predetermined width and comparing the changes in the signal obtained from the signal strength detecting means as the set value increases or decreases, and detecting the determination result. An FM/AM receiver, comprising: control means for controlling switching of the band switching means based on the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6938487U JPH0339952Y2 (en) | 1987-05-09 | 1987-05-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6938487U JPH0339952Y2 (en) | 1987-05-09 | 1987-05-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63178930U true JPS63178930U (en) | 1988-11-18 |
| JPH0339952Y2 JPH0339952Y2 (en) | 1991-08-22 |
Family
ID=30910073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6938487U Expired JPH0339952Y2 (en) | 1987-05-09 | 1987-05-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0339952Y2 (en) |
-
1987
- 1987-05-09 JP JP6938487U patent/JPH0339952Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0339952Y2 (en) | 1991-08-22 |
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