JPH01108632U - - Google Patents

Info

Publication number
JPH01108632U
JPH01108632U JP390488U JP390488U JPH01108632U JP H01108632 U JPH01108632 U JP H01108632U JP 390488 U JP390488 U JP 390488U JP 390488 U JP390488 U JP 390488U JP H01108632 U JPH01108632 U JP H01108632U
Authority
JP
Japan
Prior art keywords
circuit
switching
amplifier
switching circuit
high frequency
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
Application number
JP390488U
Other languages
Japanese (ja)
Other versions
JP2525423Y2 (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP1988003904U priority Critical patent/JP2525423Y2/en
Publication of JPH01108632U publication Critical patent/JPH01108632U/ja
Application granted granted Critical
Publication of JP2525423Y2 publication Critical patent/JP2525423Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの考案に係るＩＦ帯域自動切換え回
路の実施例を示したブロツク回路図であり、第２
図は従来のＩＦ帯域自動切換え回路を示したブロ
ツク図である。 主な符号の説明、１：アンテナ、２：フロント
エンド、３：広帯域ＩＦ増幅回路、４：狭帯域Ｉ
Ｆ増幅回路、５：切換え回路、６：検波回路、１
０：ノイズ検出回路、１１：時定数回路。 FIG. 1 is a block circuit diagram showing an embodiment of the automatic IF band switching circuit according to this invention.
The figure is a block diagram showing a conventional IF band automatic switching circuit. Explanation of main symbols, 1: Antenna, 2: Front end, 3: Wideband IF amplifier circuit, 4: Narrowband I
F amplifier circuit, 5: switching circuit, 6: detection circuit, 1
0: Noise detection circuit, 11: Time constant circuit.

Claims (1)

【実用新案登録請求の範囲】 受信された高周波信号をＩＦ周波数に変換する
フロントエンドと、 このフロントエンドから出力されたＩＦ周波数
を増幅する広帯域ＩＦ増幅回路または、狭帯域Ｉ
Ｆ増幅回路と、 このＩＦ増幅回路のいずれか一方を選択するた
めの切換え回路と、 この切換え回路を動作させるため、復調信号中
のノイズ有無によつて切換え制御信号を発生させ
るノイズ検出回路からなる高周波受信機において
、 前記のノイズ検出回路の出力側に時定数回路を
接続して、一定時間ＩＦ増幅回路の切換え動作を
保持させ、前記の切換え回路の制御を行い、切換
えチヤタリングの防止が可能な自動切換え回路を
構成することを特徴としたＩＦ帯域自動切換え回
路。[Claim for Utility Model Registration] A front end that converts a received high frequency signal into an IF frequency, and a wideband IF amplifier circuit or narrowband I/F that amplifies the IF frequency output from this front end.
It consists of an F amplifier circuit, a switching circuit for selecting one of the IF amplifier circuits, and a noise detection circuit that generates a switching control signal depending on the presence or absence of noise in the demodulated signal in order to operate this switching circuit. In a high frequency receiver, a time constant circuit is connected to the output side of the noise detection circuit to maintain the switching operation of the IF amplifier circuit for a certain period of time, and to control the switching circuit, it is possible to prevent switching chattering. An IF band automatic switching circuit comprising an automatic switching circuit.
JP1988003904U 1988-01-18 1988-01-18 Automatic IF band switching circuit for FM radio receiver for vehicle Expired - Lifetime JP2525423Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1988003904U JP2525423Y2 (en) 1988-01-18 1988-01-18 Automatic IF band switching circuit for FM radio receiver for vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988003904U JP2525423Y2 (en) 1988-01-18 1988-01-18 Automatic IF band switching circuit for FM radio receiver for vehicle

Publications (2)

Publication Number Publication Date
JPH01108632U true JPH01108632U (en) 1989-07-24
JP2525423Y2 JP2525423Y2 (en) 1997-02-12

Family

ID=31205948

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988003904U Expired - Lifetime JP2525423Y2 (en) 1988-01-18 1988-01-18 Automatic IF band switching circuit for FM radio receiver for vehicle

Country Status (1)

Country Link
JP (1) JP2525423Y2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05199134A (en) * 1991-11-22 1993-08-06 Toshiba Corp Fm receiver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110140848A1 (en) * 2007-08-24 2011-06-16 Masahiro Abukawa Broadcast receiver

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55130242A (en) * 1979-03-30 1980-10-08 Matsushita Electric Ind Co Ltd Receiver
JPS58182531U (en) * 1982-05-28 1983-12-05 パイオニア株式会社 AM receiver intermediate frequency filter automatic switching circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55130242A (en) * 1979-03-30 1980-10-08 Matsushita Electric Ind Co Ltd Receiver
JPS58182531U (en) * 1982-05-28 1983-12-05 パイオニア株式会社 AM receiver intermediate frequency filter automatic switching circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05199134A (en) * 1991-11-22 1993-08-06 Toshiba Corp Fm receiver

Also Published As

Publication number Publication date
JP2525423Y2 (en) 1997-02-12

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