JPS643230U - - Google Patents

Info

Publication number
JPS643230U
JPS643230U JP1987095721U JP9572187U JPS643230U JP S643230 U JPS643230 U JP S643230U JP 1987095721 U JP1987095721 U JP 1987095721U JP 9572187 U JP9572187 U JP 9572187U JP S643230 U JPS643230 U JP S643230U
Authority
JP
Japan
Prior art keywords
circuit
filter
broadcast receiver
pilot signal
signal detection
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
Application number
JP1987095721U
Other languages
Japanese (ja)
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 JP1987095721U priority Critical patent/JPS643230U/ja
Publication of JPS643230U publication Critical patent/JPS643230U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Circuits Of Receivers In General (AREA)
  • Stereo-Broadcasting Methods (AREA)

Description

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

第１図乃至第３図は本考案の一実施例を示した
ものである。第１図はＩＦ帯域切換回路図、第２
図は放送周波数の帯域幅のグラフ、第３図はＡＭ
放送受信機のブロツク図である。又、第４図は従
来型のＩＦ帯域切換回路図である。 符号説明、９，１３，Ｅ，＋Ｂ，ＣＦ，ＳＷ…
…端子、１０……ＩＦＴ、１１……狭帯域フイル
タ、１２……広帯域フイルタ、ＴＲ１……トラン
ジスタ、Ｄ１，Ｄ２……ダイオード。 1 to 3 show an embodiment of the present invention. Figure 1 is the IF band switching circuit diagram, Figure 2 is the IF band switching circuit diagram.
The figure is a graph of broadcast frequency bandwidth, and Figure 3 is AM.
FIG. 2 is a block diagram of a broadcast receiver. FIG. 4 is a conventional IF band switching circuit diagram. Code explanation, 9, 13, E, +B, CF, SW...
... terminal, 10 ... IFT, 11 ... narrowband filter, 12 ... wideband filter, TR 1 ... transistor, D 1 , D 2 ... diode.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] ＡＭステレオ放送受信機のＩＦ帯域切換回路に
於て、中間周波回路に並列接続された狭帯域フイ
ルタ及び広帯域フイルタと、之等各フイルタに夫
々接続されたダイオードと、パイロツト信号検出
回路とを設け、前記パイロツト信号検出回路から
の出力により、該ダイオードを選択的にオン・オ
フ制御して狭帯域フイルタと広帯域フイルタとを
切換可能にしたことを特徴とするＡＭステレオ放
送受信機のＩＦ帯域回路。 An IF band switching circuit of an AM stereo broadcast receiver includes a narrowband filter and a wideband filter connected in parallel to an intermediate frequency circuit, diodes connected to each of the filters, and a pilot signal detection circuit, An IF band circuit for an AM stereo broadcast receiver, characterized in that the diode is selectively controlled on and off by the output from the pilot signal detection circuit to enable switching between a narrowband filter and a wideband filter.
JP1987095721U 1987-06-22 1987-06-22 Pending JPS643230U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987095721U JPS643230U (en) 1987-06-22 1987-06-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987095721U JPS643230U (en) 1987-06-22 1987-06-22

Publications (1)

Publication Number Publication Date
JPS643230U true JPS643230U (en) 1989-01-10

Family

ID=31320427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987095721U Pending JPS643230U (en) 1987-06-22 1987-06-22

Country Status (1)

Country Link
JP (1) JPS643230U (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116429A (en) * 1984-11-10 1986-06-03 Takara Seisakusho:Kk Am stereo receiver
JPS61237538A (en) * 1985-04-13 1986-10-22 Sharp Corp If band automatic changeover device for am stereophonic receiver

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61116429A (en) * 1984-11-10 1986-06-03 Takara Seisakusho:Kk Am stereo receiver
JPS61237538A (en) * 1985-04-13 1986-10-22 Sharp Corp If band automatic changeover device for am stereophonic receiver

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