JPS57123785A - Carrier signal generating circuit - Google Patents

Carrier signal generating circuit

Info

Publication number
JPS57123785A
JPS57123785A JP796881A JP796881A JPS57123785A JP S57123785 A JPS57123785 A JP S57123785A JP 796881 A JP796881 A JP 796881A JP 796881 A JP796881 A JP 796881A JP S57123785 A JPS57123785 A JP S57123785A
Authority
JP
Japan
Prior art keywords
converter
phase
signals
eliminate
outputs
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
JP796881A
Other languages
Japanese (ja)
Inventor
Himio Nakagawa
Mitsuru Kudo
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 JP796881A priority Critical patent/JPS57123785A/en
Publication of JPS57123785A publication Critical patent/JPS57123785A/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
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/83—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
    • H04N9/84—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal the recorded signal showing a feature, which is different in adjacent track parts, e.g. different phase or frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To eliminate the need for an expensive filter and to improve performance by eliminating a difference frequency component by arithmetic processing and correctly holding a 90 deg. phase difference required to secure said performance. CONSTITUTION:A signal switching circuit 11 switches four 40fN signals, which are outputs of a 1/4 frequency dividing circuit 2, for every horizontal line to output two 40fN signals with a 90 deg. phase shift for every horizontal line. Those two signals are corrected into shape by the 1st D-FF4 and 2nd D-FF12 with the same clock signal to secure correct 90 deg. phase relation. The output of the 2nd oscillator 6, while supplied to the 2nd converter 14, is delayed in phase by 90 deg. by a 90 deg. phase transition circuit 16 to be supplied to the 1st converter 7. In the 2nd converter 14, the 40fN signal lags an input to the 1st converter 7 by 90 deg., and an fsc leads it by 90 deg.. The outputs of those two converters 7 and 14 are added to eliminate a difference frequency component.
JP796881A 1981-01-23 1981-01-23 Carrier signal generating circuit Pending JPS57123785A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP796881A JPS57123785A (en) 1981-01-23 1981-01-23 Carrier signal generating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP796881A JPS57123785A (en) 1981-01-23 1981-01-23 Carrier signal generating circuit

Publications (1)

Publication Number Publication Date
JPS57123785A true JPS57123785A (en) 1982-08-02

Family

ID=11680255

Family Applications (1)

Application Number Title Priority Date Filing Date
JP796881A Pending JPS57123785A (en) 1981-01-23 1981-01-23 Carrier signal generating circuit

Country Status (1)

Country Link
JP (1) JPS57123785A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5323242A (en) * 1989-01-17 1994-06-21 Hitachi, Ltd. Carrier signal generating circuit in video signal recording/reproducing apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5292426A (en) * 1976-01-30 1977-08-03 Victor Co Of Japan Ltd Phase shifter in color video signal recording and reproducing unit
JPS52106229A (en) * 1976-03-04 1977-09-06 Sony Corp Carrier wave signal formation circuit containing line offset
JPS55147892A (en) * 1979-05-07 1980-11-18 Hitachi Ltd Color signal processing unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5292426A (en) * 1976-01-30 1977-08-03 Victor Co Of Japan Ltd Phase shifter in color video signal recording and reproducing unit
JPS52106229A (en) * 1976-03-04 1977-09-06 Sony Corp Carrier wave signal formation circuit containing line offset
JPS55147892A (en) * 1979-05-07 1980-11-18 Hitachi Ltd Color signal processing unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5323242A (en) * 1989-01-17 1994-06-21 Hitachi, Ltd. Carrier signal generating circuit in video signal recording/reproducing apparatus

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