JPS57196687A - Variable phase duplex balanced modulator - Google Patents

Variable phase duplex balanced modulator

Info

Publication number
JPS57196687A
JPS57196687A JP8087881A JP8087881A JPS57196687A JP S57196687 A JPS57196687 A JP S57196687A JP 8087881 A JP8087881 A JP 8087881A JP 8087881 A JP8087881 A JP 8087881A JP S57196687 A JPS57196687 A JP S57196687A
Authority
JP
Japan
Prior art keywords
circuit
phase shift
balanced modulator
variable phase
signal
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
JP8087881A
Other languages
Japanese (ja)
Inventor
Susumu Kobayashi
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 Denshi KK
Original Assignee
Hitachi Denshi KK
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 Denshi KK filed Critical Hitachi Denshi KK
Priority to JP8087881A priority Critical patent/JPS57196687A/en
Publication of JPS57196687A publication Critical patent/JPS57196687A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To correct the phase shift of a burst signal, by providing a variable phase shift circuit giving the phase change to an original subcarrier signal in response to the amplitude of a control pulse at the output side of a duplex balanced modulator. CONSTITUTION:A duplex balanced modulator is constituted with a phase shift circuit PSF and an addition circuit ADD, and burst signals B1 and B2 are formed based on an original subcarrier signal SC given to the circuit PSF and color difference signals Cu and Cv given to balanced modulation circuits BMD1 and BMD2. A variable phase shift circuit VPS is provided at the output side of the addition circuit ADD and the phase difference between the signals B1 and B2 to the signal SC can arbitrarily be adjusted by varying the polarity and amplitude of a control pulse CP applied to the circuit VPS.
JP8087881A 1981-05-29 1981-05-29 Variable phase duplex balanced modulator Pending JPS57196687A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8087881A JPS57196687A (en) 1981-05-29 1981-05-29 Variable phase duplex balanced modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8087881A JPS57196687A (en) 1981-05-29 1981-05-29 Variable phase duplex balanced modulator

Publications (1)

Publication Number Publication Date
JPS57196687A true JPS57196687A (en) 1982-12-02

Family

ID=13730595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8087881A Pending JPS57196687A (en) 1981-05-29 1981-05-29 Variable phase duplex balanced modulator

Country Status (1)

Country Link
JP (1) JPS57196687A (en)

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