JPS54149514A - Automatic hue control circuit - Google Patents

Automatic hue control circuit

Info

Publication number
JPS54149514A
JPS54149514A JP5765478A JP5765478A JPS54149514A JP S54149514 A JPS54149514 A JP S54149514A JP 5765478 A JP5765478 A JP 5765478A JP 5765478 A JP5765478 A JP 5765478A JP S54149514 A JPS54149514 A JP S54149514A
Authority
JP
Japan
Prior art keywords
signal
oscillator
output
circuit
phase
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
JP5765478A
Other languages
Japanese (ja)
Inventor
Shigeru Ishikawa
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 JP5765478A priority Critical patent/JPS54149514A/en
Publication of JPS54149514A publication Critical patent/JPS54149514A/en
Pending legal-status Critical Current

Links

Landscapes

  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE: To prevent sudden variation in phase, caused by the skew of a regenerated signal and the phase follow-up operation of a frequency converting carrier signal on a high-density recording system, by periodically varying the loop gain of an automatic hue control system.
CONSTITUTION: A regenerated input signal from the rotary head is converted by filter 2 and frequency converter 6 into a color signal, which is outputted from high-pass filter 4 to output terminal 5. A burst signal extracted by gate circuit 8 and the output of reference signal oscillator 10 are compared eath other by phase comparator circuit 9, the output error signal voltage of which controls variable frequency oscillator 17, and variable frequency oscillator 13 is controlled by using a synchronizing signal at terminal 11, so that the automatic hue control circuit will be constituted. Then, monostable multivibrator 16 is operated by a vertical synchronizing signal extracted from an input synchronizing signal by separator circuit 15 and this pulse output increases the sensitivity of oscillator 17 and absorbs the variation in hue in a short time.
COPYRIGHT: (C)1979,JPO&Japio
JP5765478A 1978-05-17 1978-05-17 Automatic hue control circuit Pending JPS54149514A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5765478A JPS54149514A (en) 1978-05-17 1978-05-17 Automatic hue control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5765478A JPS54149514A (en) 1978-05-17 1978-05-17 Automatic hue control circuit

Publications (1)

Publication Number Publication Date
JPS54149514A true JPS54149514A (en) 1979-11-22

Family

ID=13061883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5765478A Pending JPS54149514A (en) 1978-05-17 1978-05-17 Automatic hue control circuit

Country Status (1)

Country Link
JP (1) JPS54149514A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0522747A (en) * 1991-04-26 1993-01-29 Victor Co Of Japan Ltd Pll circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0522747A (en) * 1991-04-26 1993-01-29 Victor Co Of Japan Ltd Pll circuit

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