JPS55149507A - Synchronous detecting circuit - Google Patents

Synchronous detecting circuit

Info

Publication number
JPS55149507A
JPS55149507A JP5781279A JP5781279A JPS55149507A JP S55149507 A JPS55149507 A JP S55149507A JP 5781279 A JP5781279 A JP 5781279A JP 5781279 A JP5781279 A JP 5781279A JP S55149507 A JPS55149507 A JP S55149507A
Authority
JP
Japan
Prior art keywords
synchronous detection
carrier
output
phase
picked
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
JP5781279A
Other languages
Japanese (ja)
Other versions
JPS6227566B2 (en
Inventor
Kazuo Ozeki
Junzo Murakami
Shunichi Onishi
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
Japan Broadcasting Corp
Original Assignee
Toshiba Corp
Nippon Hoso Kyokai NHK
Tokyo Shibaura Electric Co Ltd
Japan Broadcasting Corp
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, Nippon Hoso Kyokai NHK, Tokyo Shibaura Electric Co Ltd, Japan Broadcasting Corp filed Critical Toshiba Corp
Priority to JP5781279A priority Critical patent/JPS55149507A/en
Publication of JPS55149507A publication Critical patent/JPS55149507A/en
Publication of JPS6227566B2 publication Critical patent/JPS6227566B2/ja
Granted 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)
  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To detect the effect of ghost, by executing the synchronous detection with phase shift of pi/2 of carrier for synchronous detection picked up from the input modulation signal and phase-shifting the carrier for synchronous detection so that the output can be minimized. CONSTITUTION:The carrier for synchronous detection is picked up from the modulation signal f(t) with the limiter 4 and it is fed to the variable phase shifter 5. After synchronous detection of f(t) with one of the outputs of the variable phase shifter 5, the output is picked up via the LPF6. After another output is phase-shifted by pi/2, f(t) is in synchronous detection. This output is impulsive waveform. This impulsive waveform is integrated and averaged, and the variable phase shifter 5 is controlled so that the integrated output can be decreased. With this control, the phase of carrier for detection is always in agreement with that of carrier of input modulation signal.
JP5781279A 1979-05-11 1979-05-11 Synchronous detecting circuit Granted JPS55149507A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5781279A JPS55149507A (en) 1979-05-11 1979-05-11 Synchronous detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5781279A JPS55149507A (en) 1979-05-11 1979-05-11 Synchronous detecting circuit

Publications (2)

Publication Number Publication Date
JPS55149507A true JPS55149507A (en) 1980-11-20
JPS6227566B2 JPS6227566B2 (en) 1987-06-16

Family

ID=13066326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5781279A Granted JPS55149507A (en) 1979-05-11 1979-05-11 Synchronous detecting circuit

Country Status (1)

Country Link
JP (1) JPS55149507A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01117507A (en) * 1987-10-30 1989-05-10 Nec Ic Microcomput Syst Ltd Analog type frequency converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01117507A (en) * 1987-10-30 1989-05-10 Nec Ic Microcomput Syst Ltd Analog type frequency converter

Also Published As

Publication number Publication date
JPS6227566B2 (en) 1987-06-16

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