JPS58182531U - AM receiver intermediate frequency filter automatic switching circuit - Google Patents
AM receiver intermediate frequency filter automatic switching circuitInfo
- Publication number
- JPS58182531U JPS58182531U JP7758182U JP7758182U JPS58182531U JP S58182531 U JPS58182531 U JP S58182531U JP 7758182 U JP7758182 U JP 7758182U JP 7758182 U JP7758182 U JP 7758182U JP S58182531 U JPS58182531 U JP S58182531U
- Authority
- JP
- Japan
- Prior art keywords
- frequency filter
- intermediate frequency
- automatic switching
- switching circuit
- response
- 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
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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来例を示すブロック図、第２図は本考案の基
本構成を示すブロック図、第３図は第２図の一部の具体
例を示す回路図、及び第４図は第２図及び第３図の各所
の波形を示す波形図である。
２・・・・・・検出回路（ｆＩＦ±、９ＫＨｚ検出回路
）、３・・・・・・ＩＦフィルタ、４・・・・・・手段
（ミュート信号発生回路）、５・・・・・・制御回路。
（０） −口−
：；＝討＝
ｈ”ｆｚｔ５
＋二
醤芒牛
ｔｓ ｔ。FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a block diagram showing the basic configuration of the present invention, FIG. 3 is a circuit diagram showing a specific example of a part of FIG. FIG. 4 is a waveform chart showing waveforms at various locations in FIG. 4 and FIG. 3; 2...Detection circuit (fIF±, 9KHz detection circuit), 3...IF filter, 4...Means (mute signal generation circuit), 5... control circuit. (0) -口- :;= 解= h"fzt5 +two sauce pork beef ts t.
Claims (1)
ルタと、選局動作中ミュート信号を発生する手段とを有
するＡＭ受信機において、隣接局の検出に応じて出力信
号を発生する検出回路と、該検出回路の出力信号に応じ
て第１の一定時間後前記中間周波フィルタを狭帯域に切
換え、この状態を前記出力信号のなくなった後も第２の
一定時間保持し、かつ前記ミュート信号に応じて前記中
間周波フィルタを狭帯域に切換え、この状態を前記ミュ
ート信号のなくなった後も前記第１の一定時間より長い
第３の一定時間保持する制御を行う制御回路とを備える
こきを特徴とする中間周波フィルタ自動切換回路。In an AM receiver having an intermediate frequency filter that can be switched to a wide band and a narrow band, and a means for generating a mute signal during a channel selection operation, a detection circuit that generates an output signal in response to detection of an adjacent station; Switching the intermediate frequency filter to a narrow band after a first predetermined time period in response to the output signal of the detection circuit, maintaining this state for a second predetermined time period even after the output signal disappears, and in response to the mute signal. and a control circuit that performs control to switch the intermediate frequency filter to a narrow band and maintain this state for a third fixed period longer than the first fixed period even after the mute signal disappears. Frequency filter automatic switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7758182U JPS58182531U (en) | 1982-05-28 | 1982-05-28 | AM receiver intermediate frequency filter automatic switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7758182U JPS58182531U (en) | 1982-05-28 | 1982-05-28 | AM receiver intermediate frequency filter automatic switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58182531U true JPS58182531U (en) | 1983-12-05 |
| JPS6314505Y2 JPS6314505Y2 (en) | 1988-04-22 |
Family
ID=30086831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7758182U Granted JPS58182531U (en) | 1982-05-28 | 1982-05-28 | AM receiver intermediate frequency filter automatic switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58182531U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01108632U (en) * | 1988-01-18 | 1989-07-24 |
-
1982
- 1982-05-28 JP JP7758182U patent/JPS58182531U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01108632U (en) * | 1988-01-18 | 1989-07-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6314505Y2 (en) | 1988-04-22 |
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