JPS5718181A - Digital clipping circuit - Google Patents

Digital clipping circuit

Info

Publication number
JPS5718181A
JPS5718181A JP9359880A JP9359880A JPS5718181A JP S5718181 A JPS5718181 A JP S5718181A JP 9359880 A JP9359880 A JP 9359880A JP 9359880 A JP9359880 A JP 9359880A JP S5718181 A JPS5718181 A JP S5718181A
Authority
JP
Japan
Prior art keywords
addition result
signal
gate
chroma signal
clipping circuit
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
JP9359880A
Other languages
Japanese (ja)
Other versions
JPH029754B2 (en
Inventor
Akihiko Minami
Yutaka Tanaka
Hideji Hirakawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP9359880A priority Critical patent/JPS5718181A/en
Publication of JPS5718181A publication Critical patent/JPS5718181A/en
Publication of JPH029754B2 publication Critical patent/JPH029754B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits

Abstract

PURPOSE:To clip a signal level in a proper range, by substituting other value for an addition result, in case when an addition result of a chroma signal and a luminance signal has been decided as overflow or underflow. CONSTITUTION:When an addition result of a chroma signal 1a and a luminance signal 1b is an overflow in an adder 1, a carry output CO is provided to an AND gate 4 through an AND gate 3 and an inverter 5. The AND gate 3 takes AND of an inversion signal of MSB of the chroma signal 1a, and CO, and substitutes all ''1'' for an addition result if 1a is positive and CO is ''1''. In case when the addition result is smaller than a lower end value N, said gate substitutes N for the addition result. If the chroma signal 1a is negative and also the carry output CO is ''0'', the addition result is decided as an underflow, and N is substituted for the addition result.
JP9359880A 1980-07-09 1980-07-09 Digital clipping circuit Granted JPS5718181A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9359880A JPS5718181A (en) 1980-07-09 1980-07-09 Digital clipping circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9359880A JPS5718181A (en) 1980-07-09 1980-07-09 Digital clipping circuit

Publications (2)

Publication Number Publication Date
JPS5718181A true JPS5718181A (en) 1982-01-29
JPH029754B2 JPH029754B2 (en) 1990-03-05

Family

ID=14086744

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9359880A Granted JPS5718181A (en) 1980-07-09 1980-07-09 Digital clipping circuit

Country Status (1)

Country Link
JP (1) JPS5718181A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04288777A (en) * 1990-04-13 1992-10-13 Thomson Consumer Electron Inc Power supply for cathode-ray tube

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911476A (en) * 1973-03-20 1975-10-07 Rca Corp Color picture/sound record
JPS5184515A (en) * 1975-01-22 1976-07-23 Hitachi Ltd
JPS51130117A (en) * 1975-05-06 1976-11-12 Nec Corp Video signal clipping circuit
US4200881A (en) * 1976-08-09 1980-04-29 Rca Corporation Encoding and transcoding apparatus for video disc systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911476A (en) * 1973-03-20 1975-10-07 Rca Corp Color picture/sound record
JPS5184515A (en) * 1975-01-22 1976-07-23 Hitachi Ltd
JPS51130117A (en) * 1975-05-06 1976-11-12 Nec Corp Video signal clipping circuit
US4200881A (en) * 1976-08-09 1980-04-29 Rca Corporation Encoding and transcoding apparatus for video disc systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04288777A (en) * 1990-04-13 1992-10-13 Thomson Consumer Electron Inc Power supply for cathode-ray tube

Also Published As

Publication number Publication date
JPH029754B2 (en) 1990-03-05

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