JPS5738038A - Fm receiver - Google Patents

Fm receiver

Info

Publication number
JPS5738038A
JPS5738038A JP11350780A JP11350780A JPS5738038A JP S5738038 A JPS5738038 A JP S5738038A JP 11350780 A JP11350780 A JP 11350780A JP 11350780 A JP11350780 A JP 11350780A JP S5738038 A JPS5738038 A JP S5738038A
Authority
JP
Japan
Prior art keywords
stereo
signal
input
circuit
amplifier
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
JP11350780A
Other languages
Japanese (ja)
Other versions
JPS6255742B2 (en
Inventor
Masanori Ienaka
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 JP11350780A priority Critical patent/JPS5738038A/en
Publication of JPS5738038A publication Critical patent/JPS5738038A/en
Publication of JPS6255742B2 publication Critical patent/JPS6255742B2/ja
Granted 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
    • H04H40/63—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 separation improvements or adjustments
    • 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
    • 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

Abstract

PURPOSE:To increase the S/N by making the changeover of stereo/monaural according to the reception state of broadcast waves, through the provision of a variable low-pass filter at the input side of a stereo demodulation circuit and the operation of a PLL circuit with a composite signal not passing through the variable low-pass filter. CONSTITUTION:A stereo signal received at an antenna 24 is applied to an FM intermediate frequency processing IC1 via an amplifier 25, mixer 26 and filter 28. When a sufficent input is obtained, voltage is applied to a signal supply circuit 22 of a semiconductor integrated circuit IC2 for FM stereo demodulation from the terminal 13 at the output side of a tuning meter driving circuit 38, and high level 38kHz switching signal is applied to stereo demodulation circuits 20, 21 for stereo reproduction. When an input level is lowered, a 38kHz signal is lowered to decrease the separation. When the input further decreases, an audio amplifier 41 is interrupted with an audio muting controlling amplifier 43 to stop the reproduction of voice.
JP11350780A 1980-08-20 1980-08-20 Fm receiver Granted JPS5738038A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11350780A JPS5738038A (en) 1980-08-20 1980-08-20 Fm receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11350780A JPS5738038A (en) 1980-08-20 1980-08-20 Fm receiver

Publications (2)

Publication Number Publication Date
JPS5738038A true JPS5738038A (en) 1982-03-02
JPS6255742B2 JPS6255742B2 (en) 1987-11-20

Family

ID=14614073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11350780A Granted JPS5738038A (en) 1980-08-20 1980-08-20 Fm receiver

Country Status (1)

Country Link
JP (1) JPS5738038A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55109046A (en) * 1979-02-13 1980-08-21 Sanyo Electric Co Ltd Stereo demodulator circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55109046A (en) * 1979-02-13 1980-08-21 Sanyo Electric Co Ltd Stereo demodulator circuit

Also Published As

Publication number Publication date
JPS6255742B2 (en) 1987-11-20

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