JPS54150903A - Car radio - Google Patents

Car radio

Info

Publication number
JPS54150903A
JPS54150903A JP5894978A JP5894978A JPS54150903A JP S54150903 A JPS54150903 A JP S54150903A JP 5894978 A JP5894978 A JP 5894978A JP 5894978 A JP5894978 A JP 5894978A JP S54150903 A JPS54150903 A JP S54150903A
Authority
JP
Japan
Prior art keywords
circuit
signals
weak
frequency characteristics
noise
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
JP5894978A
Other languages
Japanese (ja)
Inventor
Michiaki Kurosawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5894978A priority Critical patent/JPS54150903A/en
Publication of JPS54150903A publication Critical patent/JPS54150903A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
    • H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
    • H04H40/72—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for noise suppression
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1646—Circuits adapted for the reception of stereophonic signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuits Of Receivers In General (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To reduce the noise greatly by providing the circuit consisting of the transistor, the capacitor and the resistance each to the detection circuit and then varying the frequency characteristics supplied to the stereo demodulation circuit with switching to the monaural operation in case the receiving wave is weak. CONSTITUTION:Part of the IF signals of IF amplifier circuit 3 is led to detection circuit 6, and the DC signals obtained are applied to the base of switching transistor Tr18 through the bias resistor. And the collector of Tr18 is connected to the circuit 5 side of resistor 20 provided before and after stereo demodulation circuit 5 via capacitor 19, and the emitter is earthed. As a result, in case the receiving wave is weak, the frequency characteristics of the signals supplied to circuit 5 is varied. At the same time, circuit 5 is switched to the monaural operation. Thus, the noise can be reduced greatly.
JP5894978A 1978-05-19 1978-05-19 Car radio Pending JPS54150903A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5894978A JPS54150903A (en) 1978-05-19 1978-05-19 Car radio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5894978A JPS54150903A (en) 1978-05-19 1978-05-19 Car radio

Publications (1)

Publication Number Publication Date
JPS54150903A true JPS54150903A (en) 1979-11-27

Family

ID=13099071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5894978A Pending JPS54150903A (en) 1978-05-19 1978-05-19 Car radio

Country Status (1)

Country Link
JP (1) JPS54150903A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347404A (en) * 1979-07-02 1982-08-31 Nissan Motor Co., Ltd. Control device for an automotive vehicle FM radio
JPS58106919A (en) * 1981-12-18 1983-06-25 Sharp Corp Noise reducing circuit in fm tuner
JPS58127743U (en) * 1982-02-19 1983-08-30 クラリオン株式会社 fm stereo receiver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347404A (en) * 1979-07-02 1982-08-31 Nissan Motor Co., Ltd. Control device for an automotive vehicle FM radio
JPS58106919A (en) * 1981-12-18 1983-06-25 Sharp Corp Noise reducing circuit in fm tuner
JPS58127743U (en) * 1982-02-19 1983-08-30 クラリオン株式会社 fm stereo receiver

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