JPH01149140U - - Google Patents
Info
- Publication number
- JPH01149140U JPH01149140U JP4539988U JP4539988U JPH01149140U JP H01149140 U JPH01149140 U JP H01149140U JP 4539988 U JP4539988 U JP 4539988U JP 4539988 U JP4539988 U JP 4539988U JP H01149140 U JPH01149140 U JP H01149140U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- mixer
- pass filter
- receiving antenna
- radio receiver
- 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
- 238000001514 detection method Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000005236 sound signal Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Superheterodyne Receivers (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Description
第１図はこの考案のＡＭラジオ受信機の一実施
例を示すブロツク図、第２図は他の実施例を示す
ブロツク図、第３図は第２図の動作説明に供する
ための説明図、第４図は中波放送の受信帯域幅を
示す説明図である。
１……受信アンテナ、２……ローパス・フイル
タ、６……混合器、１１……ＣＰＵ（検出手段）
、１２……トランジスタ、１４……比較回路（ｆ
ａ検出手段）。
FIG. 1 is a block diagram showing one embodiment of the AM radio receiver of this invention, FIG. 2 is a block diagram showing another embodiment, and FIG. 3 is an explanatory diagram for explaining the operation of FIG. 2. FIG. 4 is an explanatory diagram showing the reception bandwidth of medium wave broadcasting. 1...Receiving antenna, 2...Low pass filter, 6...Mixer, 11...CPU (detection means)
, 12...transistor, 14...comparison circuit (f
a detection means).
Claims (1)
おいて中間周波信号に変換し、この中間周波信号
を検波して音声信号を得るＡＭラジオ受信機にお
いて、上記受信アンテナおよび混合器の間に挿入
され、妨害帯域の信号を遮断するローパス・フイ
ルタと、受信すべき信号の周波数が予め決められ
ている周波数より大か否かを検出する検出手段と
、上記検出手段における検出結果が大であつた場
合に上記ローパス・フイルタを不動作とする手段
とを具備してなるＡＭラジオ受信機。 In an AM radio receiver that converts a signal received by a receiving antenna into an intermediate frequency signal in a mixer and detects this intermediate frequency signal to obtain an audio signal, it is inserted between the receiving antenna and the mixer to prevent interference. a low-pass filter for blocking signals in the band; a detection means for detecting whether the frequency of the signal to be received is higher than a predetermined frequency; An AM radio receiver comprising means for disabling a low-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4539988U JPH01149140U (en) | 1988-04-04 | 1988-04-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4539988U JPH01149140U (en) | 1988-04-04 | 1988-04-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01149140U true JPH01149140U (en) | 1989-10-16 |
Family
ID=31271711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4539988U Pending JPH01149140U (en) | 1988-04-04 | 1988-04-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01149140U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5781713A (en) * | 1980-11-11 | 1982-05-21 | Toshiba Corp | Wide-band amplifier |
-
1988
- 1988-04-04 JP JP4539988U patent/JPH01149140U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5781713A (en) * | 1980-11-11 | 1982-05-21 | Toshiba Corp | Wide-band amplifier |
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