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JPS57188111A - Synchronizing detection circuit - Google Patents

Synchronizing detection circuit

Info

Publication number
JPS57188111A
JPS57188111A JP7262281A JP7262281A JPS57188111A JP S57188111 A JPS57188111 A JP S57188111A JP 7262281 A JP7262281 A JP 7262281A JP 7262281 A JP7262281 A JP 7262281A JP S57188111 A JPS57188111 A JP S57188111A
Authority
JP
Japan
Prior art keywords
signal
multiplier
synchronizing
detection circuit
comparator
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
JP7262281A
Other languages
Japanese (ja)
Inventor
Hiromi Kusakabe
Atsushi Ogawa
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 JP7262281A priority Critical patent/JPS57188111A/en
Publication of JPS57188111A publication Critical patent/JPS57188111A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To prevent the generation of pop noise when a signal is switched, by making the DC level of a detected output stable and enabling the direct coupling with the next stage, through the comparison of the detected output with a reference voltage and the feedback it to a detection circuit. CONSTITUTION:A carrier component of an AM input signal is reproduced with a phase locked loop 11. An AM input signal phase-shifted by 90 deg. with a phase shifter 12 and said carrier component are multiplied at a multiplier 13 for the product of the both and the result is introduced to an output terminal of the multiplier 13 as a synchronizing signal. Said synchronizing detection signal is compared with a reference voltage at a comparator 15, and the difference is fed back in a main body of the multiplier 13 through a low pass filter 17. The DC level fluctuation of the synchronizing detection signal is decreased to 1/gain of the comparator 14.
JP7262281A 1981-05-14 1981-05-14 Synchronizing detection circuit Pending JPS57188111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7262281A JPS57188111A (en) 1981-05-14 1981-05-14 Synchronizing detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7262281A JPS57188111A (en) 1981-05-14 1981-05-14 Synchronizing detection circuit

Publications (1)

Publication Number Publication Date
JPS57188111A true JPS57188111A (en) 1982-11-19

Family

ID=13494661

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7262281A Pending JPS57188111A (en) 1981-05-14 1981-05-14 Synchronizing detection circuit

Country Status (1)

Country Link
JP (1) JPS57188111A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6248758A (en) * 1985-08-28 1987-03-03 Asahi Chem Ind Co Ltd Highly elastic hyrogenated block copolymer composition
JPH03220823A (en) * 1990-01-25 1991-09-30 Japan Radio Co Ltd Direct conversion receiver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6248758A (en) * 1985-08-28 1987-03-03 Asahi Chem Ind Co Ltd Highly elastic hyrogenated block copolymer composition
JPH0578582B2 (en) * 1985-08-28 1993-10-29 Asahi Chemical Ind
JPH03220823A (en) * 1990-01-25 1991-09-30 Japan Radio Co Ltd Direct conversion receiver

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