JPS56157185A - Controlling circuit for amplitude of subcarrier - Google Patents

Controlling circuit for amplitude of subcarrier

Info

Publication number
JPS56157185A
JPS56157185A JP6017580A JP6017580A JPS56157185A JP S56157185 A JPS56157185 A JP S56157185A JP 6017580 A JP6017580 A JP 6017580A JP 6017580 A JP6017580 A JP 6017580A JP S56157185 A JPS56157185 A JP S56157185A
Authority
JP
Japan
Prior art keywords
subcarrier
amplitude
rectangular wave
comparator
controlled
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
JP6017580A
Other languages
Japanese (ja)
Other versions
JPS6134716B2 (en
Inventor
Isamu Kitahama
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP6017580A priority Critical patent/JPS56157185A/en
Publication of JPS56157185A publication Critical patent/JPS56157185A/en
Publication of JPS6134716B2 publication Critical patent/JPS6134716B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems

Landscapes

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

Abstract

PURPOSE:To completely minimize the output level of subcarrier, by converting a subcarrier to a rectangular wave by a comparator while preventing a phase shift and then controlling the amplitude through a clipping circuit. CONSTITUTION:The input subcarrier S1 of a sine wave passes through a coupling capacitor 1 and is compared with the earth potential of average value of the subcarrier by a comparator 2 and then converted to a rectangular wave S2. In this case, the comparison with the center value is given to prevent the occurrence of a phase change during a conversion to the rectangular wave. The output S2 of the comparator 2 is supplied to a clipping circuit 3, and then the amplitude is controlled (S3) according to the control voltage. The rectangular wave S3 having the controlled amplitude is turned again to a sine wave through a band pass filter 4 to be delivered.
JP6017580A 1980-05-07 1980-05-07 Controlling circuit for amplitude of subcarrier Granted JPS56157185A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6017580A JPS56157185A (en) 1980-05-07 1980-05-07 Controlling circuit for amplitude of subcarrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6017580A JPS56157185A (en) 1980-05-07 1980-05-07 Controlling circuit for amplitude of subcarrier

Publications (2)

Publication Number Publication Date
JPS56157185A true JPS56157185A (en) 1981-12-04
JPS6134716B2 JPS6134716B2 (en) 1986-08-08

Family

ID=13134547

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6017580A Granted JPS56157185A (en) 1980-05-07 1980-05-07 Controlling circuit for amplitude of subcarrier

Country Status (1)

Country Link
JP (1) JPS56157185A (en)

Also Published As

Publication number Publication date
JPS6134716B2 (en) 1986-08-08

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