JPS56154876A - Frequency stabilization system - Google Patents

Frequency stabilization system

Info

Publication number
JPS56154876A
JPS56154876A JP5712280A JP5712280A JPS56154876A JP S56154876 A JPS56154876 A JP S56154876A JP 5712280 A JP5712280 A JP 5712280A JP 5712280 A JP5712280 A JP 5712280A JP S56154876 A JPS56154876 A JP S56154876A
Authority
JP
Japan
Prior art keywords
frequency
circuit
chrominance subcarrier
control
masterosc
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
JP5712280A
Other languages
Japanese (ja)
Other versions
JPS6041913B2 (en
Inventor
Kenji Koro
Takahisa Nakayama
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP55057122A priority Critical patent/JPS6041913B2/en
Publication of JPS56154876A publication Critical patent/JPS56154876A/en
Publication of JPS6041913B2 publication Critical patent/JPS6041913B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Systems (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To exercise highly stable control over transmission frequency at low cost by utilizing a chrominance subcarrier as a reference frequency source and by using a reference signal generator when it is unstable. CONSTITUTION:Through receiving conversion part RX and local oscillator LO1 for reception and modulation, an input signal from terminal IN is converted into an IF signal after video detecting circuit DET performs video detection, chrominance subcarrier regenerating circuit FsREGN regenerates a chrominance subcarrier. To increase comparison frequency, frequency dividing/multiplying circuit A performs 8/63 processing, and circuit B 1/22 processing in the case of the NTSC system. Both the output signals are supplied to phase detector P.DET2 for phase detection, and an error signal passes through control circuit CONT to control reference signal generator MASTEROSC. Thus, the oscillation frequency Fref has the same stability with chrominance carrier Fs to obtain the extremely high stability. If the stability deteriorates, however, CONT decreases the frequency range of MASTEROSC and also controls the width of a control voltage.
JP55057122A 1980-05-01 1980-05-01 Frequency stabilization method Expired JPS6041913B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55057122A JPS6041913B2 (en) 1980-05-01 1980-05-01 Frequency stabilization method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55057122A JPS6041913B2 (en) 1980-05-01 1980-05-01 Frequency stabilization method

Publications (2)

Publication Number Publication Date
JPS56154876A true JPS56154876A (en) 1981-11-30
JPS6041913B2 JPS6041913B2 (en) 1985-09-19

Family

ID=13046742

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55057122A Expired JPS6041913B2 (en) 1980-05-01 1980-05-01 Frequency stabilization method

Country Status (1)

Country Link
JP (1) JPS6041913B2 (en)

Also Published As

Publication number Publication date
JPS6041913B2 (en) 1985-09-19

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