JPS54140825A - Picture-quality improving circuit of color television receiver - Google Patents

Picture-quality improving circuit of color television receiver

Info

Publication number
JPS54140825A
JPS54140825A JP4852878A JP4852878A JPS54140825A JP S54140825 A JPS54140825 A JP S54140825A JP 4852878 A JP4852878 A JP 4852878A JP 4852878 A JP4852878 A JP 4852878A JP S54140825 A JPS54140825 A JP S54140825A
Authority
JP
Japan
Prior art keywords
signal
circuit
picture
output
supplied
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
JP4852878A
Other languages
Japanese (ja)
Other versions
JPS6029275B2 (en
Inventor
Masutomi Oota
Kunio Ando
Masanori Ogino
Gentaro Miyazaki
Hiroaki Nabeyama
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 JP53048528A priority Critical patent/JPS6029275B2/en
Publication of JPS54140825A publication Critical patent/JPS54140825A/en
Publication of JPS6029275B2 publication Critical patent/JPS6029275B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To make it possible to reproduce a picture whose contour is clear even at the boundary where the picture changes in color.
CONSTITUTION: By passing through high-pass filter 1, luminance signal Y has the only high-band component left and is slightly delayed. Color-difference signal C, on the other hand, is separated into two signals; one signal is supplied to switch alternation circuit 4 via delay circuit 3, and the other is directly to circuit 4. As for the output color difference signal, switch alternation circuit 4 is so switched that signal (d) delayed by circuit 4 will be outputted before a switching signal is supplied from trigger generating circuit 2 to switch alternating circuit 4 by the high component of the luminance signal, namely, a signal indicating the contour position of the picture so as to output the undelayed color difference signal. Then, signals C and (d) are compared by comparator circuit 5 and when the both agree each other, switching signal (f) is supplied in order to output signal (d) by switching. Further, the high-band component of the luminance signal energizes circuit 4, whose output is changed from signal (d) to C.
COPYRIGHT: (C)1979,JPO&Japio
JP53048528A 1978-04-24 1978-04-24 Image quality improvement circuit for color television receivers Expired JPS6029275B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53048528A JPS6029275B2 (en) 1978-04-24 1978-04-24 Image quality improvement circuit for color television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53048528A JPS6029275B2 (en) 1978-04-24 1978-04-24 Image quality improvement circuit for color television receivers

Publications (2)

Publication Number Publication Date
JPS54140825A true JPS54140825A (en) 1979-11-01
JPS6029275B2 JPS6029275B2 (en) 1985-07-09

Family

ID=12805852

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53048528A Expired JPS6029275B2 (en) 1978-04-24 1978-04-24 Image quality improvement circuit for color television receivers

Country Status (1)

Country Link
JP (1) JPS6029275B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506293A (en) * 1981-07-16 1985-03-19 Rca Corporation Independent fleshtone contours
US4739395A (en) * 1985-11-21 1988-04-19 U.S. Philips Corporation Circuit arrangement for increasing the definition of color contours of a color television signal using selective edge enhancement
US4912551A (en) * 1987-08-04 1990-03-27 Victor Company Of Japan, Ltd. Circuit for enhancing a color difference signal by utilizing the change of a luminance signal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4506293A (en) * 1981-07-16 1985-03-19 Rca Corporation Independent fleshtone contours
US4739395A (en) * 1985-11-21 1988-04-19 U.S. Philips Corporation Circuit arrangement for increasing the definition of color contours of a color television signal using selective edge enhancement
US4912551A (en) * 1987-08-04 1990-03-27 Victor Company Of Japan, Ltd. Circuit for enhancing a color difference signal by utilizing the change of a luminance signal
US4980755A (en) * 1987-08-04 1990-12-25 Victor Company Of Japan, Ltd. Circuit for enhancing a color difference signal by utilizing the change of a luminance signal

Also Published As

Publication number Publication date
JPS6029275B2 (en) 1985-07-09

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