JPS56116345A - Fm stereo demodulation circuit - Google Patents

Fm stereo demodulation circuit

Info

Publication number
JPS56116345A
JPS56116345A JP1900780A JP1900780A JPS56116345A JP S56116345 A JPS56116345 A JP S56116345A JP 1900780 A JP1900780 A JP 1900780A JP 1900780 A JP1900780 A JP 1900780A JP S56116345 A JPS56116345 A JP S56116345A
Authority
JP
Japan
Prior art keywords
monitor
voltage
circuit
voc5
oscillation
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
JP1900780A
Other languages
Japanese (ja)
Other versions
JPS6317256B2 (en
Inventor
Kazuo Watanabe
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 JP1900780A priority Critical patent/JPS56116345A/en
Publication of JPS56116345A publication Critical patent/JPS56116345A/en
Publication of JPS6317256B2 publication Critical patent/JPS6317256B2/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/22—Homodyne or synchrodyne circuits
    • H03D1/2209—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders
    • H03D1/2236—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders using a phase locked loop
    • 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
    • H04H40/54—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 generating subcarriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To make common use of terminals and to reduce the external terminals, by using the monitor terminal of a voltage controlled type oscillation circuit as the oscillation stop input terminal for the oscillation circuit, in an FM stereo demodulation circuit of PLL system. CONSTITUTION:To the monitor terminal P12 receiving the monitor signal which adjusts the free-run frequency of a voltage contrlled oscillation circuit VOC5 so that it is around 76kHz through the pickup of the output of a frequency dividing circuit 8, a voltage signal in excess of the monitor signal level is compulsively fed externally, allowing the oscillation stop of VOC5. Since the detection level of a voltage detection circuit 15 is set to a given voltage in excess of the monitor output level, the stop operation of VOC5 is not made with the monitor output.
JP1900780A 1980-02-20 1980-02-20 Fm stereo demodulation circuit Granted JPS56116345A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1900780A JPS56116345A (en) 1980-02-20 1980-02-20 Fm stereo demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1900780A JPS56116345A (en) 1980-02-20 1980-02-20 Fm stereo demodulation circuit

Publications (2)

Publication Number Publication Date
JPS56116345A true JPS56116345A (en) 1981-09-12
JPS6317256B2 JPS6317256B2 (en) 1988-04-13

Family

ID=11987448

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1900780A Granted JPS56116345A (en) 1980-02-20 1980-02-20 Fm stereo demodulation circuit

Country Status (1)

Country Link
JP (1) JPS56116345A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399784A (en) * 1977-02-10 1978-08-31 Nec Corp Integrated circuit device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5399784A (en) * 1977-02-10 1978-08-31 Nec Corp Integrated circuit device

Also Published As

Publication number Publication date
JPS6317256B2 (en) 1988-04-13

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