JPS54148401A - Pilot signal negating circuit - Google Patents

Pilot signal negating circuit

Info

Publication number
JPS54148401A
JPS54148401A JP5740678A JP5740678A JPS54148401A JP S54148401 A JPS54148401 A JP S54148401A JP 5740678 A JP5740678 A JP 5740678A JP 5740678 A JP5740678 A JP 5740678A JP S54148401 A JPS54148401 A JP S54148401A
Authority
JP
Japan
Prior art keywords
pilot
triangular wave
signal
pilot signal
input
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
JP5740678A
Other languages
Japanese (ja)
Inventor
Hiromi Kusakabe
Hisao Kuwabara
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5740678A priority Critical patent/JPS54148401A/en
Publication of JPS54148401A publication Critical patent/JPS54148401A/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
    • H04B1/1653—Detection of the presence of stereo signals and pilot signal regeneration

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Noise Elimination (AREA)
  • Stereo-Broadcasting Methods (AREA)

Abstract

PURPOSE:To increase the deletion amount of the residual carrier as soon as possible for the PLLMPX demodulation system by connecting the serial resonance circuit to the input pilot negating triangular wave generation circuit. CONSTITUTION:The signal of 19K Hz produced at PLL11 turns on and off alternately current source S1 and S2 via switching circuit 12. The triangular wave (a) caused by charging/discharging of capacitor C1 is produced at point P in the reverse phase to the input pilot signal and then added 14 to the input composite signal after level adjustment 13. Thus, the pilot signals are deleted. In this case, serial resonance circuit SR consisting of L1 and C2 is connected to both ends of C1 to absorb the higher harmonic component of the pilot signal in order to secure an effective growing of triangular wave component (b) at point P. Thus, the amount of delection can be increased for the pilot signals.
JP5740678A 1978-05-15 1978-05-15 Pilot signal negating circuit Pending JPS54148401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5740678A JPS54148401A (en) 1978-05-15 1978-05-15 Pilot signal negating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5740678A JPS54148401A (en) 1978-05-15 1978-05-15 Pilot signal negating circuit

Publications (1)

Publication Number Publication Date
JPS54148401A true JPS54148401A (en) 1979-11-20

Family

ID=13054752

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5740678A Pending JPS54148401A (en) 1978-05-15 1978-05-15 Pilot signal negating circuit

Country Status (1)

Country Link
JP (1) JPS54148401A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300020A (en) * 1979-02-15 1981-11-10 Victor Company Of Japan, Limited Method and apparatus for eliminating pilot signal components from stereo demodulated signals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300020A (en) * 1979-02-15 1981-11-10 Victor Company Of Japan, Limited Method and apparatus for eliminating pilot signal components from stereo demodulated signals

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