JPS55145413A - Correcting circuit for emphasis amount - Google Patents

Correcting circuit for emphasis amount

Info

Publication number
JPS55145413A
JPS55145413A JP5151179A JP5151179A JPS55145413A JP S55145413 A JPS55145413 A JP S55145413A JP 5151179 A JP5151179 A JP 5151179A JP 5151179 A JP5151179 A JP 5151179A JP S55145413 A JPS55145413 A JP S55145413A
Authority
JP
Japan
Prior art keywords
burst
gain
amount
capacity
emphasis
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
JP5151179A
Other languages
Japanese (ja)
Other versions
JPS6161288B2 (en
Inventor
Noboru Kojima
Akira Shibata
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 JP5151179A priority Critical patent/JPS55145413A/en
Publication of JPS55145413A publication Critical patent/JPS55145413A/en
Publication of JPS6161288B2 publication Critical patent/JPS6161288B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control

Landscapes

  • Control Of Amplification And Gain Control (AREA)
  • Television Receiver Circuits (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To facilitate the easy correction of the gain via the external peripheral circuit for the IC which gives the switching to the gain of the specified period. CONSTITUTION:If the emphasis amount of circuit 23 is A at the nonfeedback time, G=A/1-Abeta is obtained with feedback amount beta. And beta=R1/R1+R2 is obtained when the capacity is negligible in comparison with resistances 25(R1) and 26(R2). Accordingly, R1/R2=1+AG/G-A is obtained, and then the easy correction is secured for the emphasis amount by obtaining R1/R2 based on G and A. For instance, the phase change amount can be compensated with capacities 27 and 28 between the burst and chroma signals due to the burst emphasis for the color signal process of the VTR. In other words, the phase of the feedback element is delayed with capacity 27 in the correction and then gained with capacity 28 in order to operate the phase of the burst signal flowing to transistor 8 and resistance RB into the direction of loss or gain. In such way, the reduction is given to the phase change amount caused by the gain switching between the burst and chroma signals, thus preventing the color error.
JP5151179A 1979-04-27 1979-04-27 Correcting circuit for emphasis amount Granted JPS55145413A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5151179A JPS55145413A (en) 1979-04-27 1979-04-27 Correcting circuit for emphasis amount

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5151179A JPS55145413A (en) 1979-04-27 1979-04-27 Correcting circuit for emphasis amount

Publications (2)

Publication Number Publication Date
JPS55145413A true JPS55145413A (en) 1980-11-13
JPS6161288B2 JPS6161288B2 (en) 1986-12-25

Family

ID=12889020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5151179A Granted JPS55145413A (en) 1979-04-27 1979-04-27 Correcting circuit for emphasis amount

Country Status (1)

Country Link
JP (1) JPS55145413A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58156284A (en) * 1982-03-12 1983-09-17 Hitachi Ltd Color signal processing circuit of magnetic recording and reproducing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0433315U (en) * 1990-07-17 1992-03-18

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58156284A (en) * 1982-03-12 1983-09-17 Hitachi Ltd Color signal processing circuit of magnetic recording and reproducing device
JPH0419757B2 (en) * 1982-03-12 1992-03-31 Hitachi Ltd

Also Published As

Publication number Publication date
JPS6161288B2 (en) 1986-12-25

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