GB1191096A - Circuit Arrangement for Limiting the White Level in Television Signals, More Particularly in Colour Television Signals - Google Patents

Circuit Arrangement for Limiting the White Level in Television Signals, More Particularly in Colour Television Signals

Info

Publication number
GB1191096A
GB1191096A GB765769A GB765769A GB1191096A GB 1191096 A GB1191096 A GB 1191096A GB 765769 A GB765769 A GB 765769A GB 765769 A GB765769 A GB 765769A GB 1191096 A GB1191096 A GB 1191096A
Authority
GB
United Kingdom
Prior art keywords
signal
television signals
white level
limiting
circuit arrangement
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.)
Expired
Application number
GB765769A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1191096A publication Critical patent/GB1191096A/en
Expired 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
    • H04N9/648—Video amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit

Landscapes

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

Abstract

1,191,096. Television. INTERNATIONAL STANDARD ELECTRIC CORP. 12 Feb., 1969 [15 Feb., 1968], No. 7657/69. Heading H4F. Frequency-dependent limitation of the white level of a television signal is effected by dividing into two parallel paths I and II, the signal at the output of transistor amplifier T 1 , the signal having been clamped CN to synchronizing base or black level, path I including a compensating network W 1 /C 1 /L 1 which acts as a low-pass filter and removes frequencies above 0À5 Mc/s., in particular the colour sub-carrier 4À43 Mc/s., and a base clipper T 3 /T 4 which amplifies the excess white portion of the signal, the resulting white portion being added T 5 /T 6 to the original signal in channel II in phase opposition so that the original signal with its white level limited appears at output load resistor W 4 .
GB765769A 1968-02-15 1969-02-12 Circuit Arrangement for Limiting the White Level in Television Signals, More Particularly in Colour Television Signals Expired GB1191096A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEST027878 1968-02-15
DE19681562026 DE1562026C3 (en) 1968-02-15 1968-02-15 Circuit arrangement for limiting the frequency of the white value of color video signals

Publications (1)

Publication Number Publication Date
GB1191096A true GB1191096A (en) 1970-05-06

Family

ID=25753034

Family Applications (1)

Application Number Title Priority Date Filing Date
GB765769A Expired GB1191096A (en) 1968-02-15 1969-02-12 Circuit Arrangement for Limiting the White Level in Television Signals, More Particularly in Colour Television Signals

Country Status (2)

Country Link
DE (1) DE1562026C3 (en)
GB (1) GB1191096A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101932A (en) * 1975-11-17 1978-07-18 Harris Corporation Video preamplifier for camera operated in act mode
EP0700201A3 (en) * 1994-08-30 1996-07-24 Plessey Semiconductors Ltd A white clip circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2223908C3 (en) * 1972-05-17 1981-05-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Circuit for eliminating the sync pulses S in a BAS video signal
JPS5754983B2 (en) * 1974-04-19 1982-11-20

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101932A (en) * 1975-11-17 1978-07-18 Harris Corporation Video preamplifier for camera operated in act mode
EP0700201A3 (en) * 1994-08-30 1996-07-24 Plessey Semiconductors Ltd A white clip circuit
US5734440A (en) * 1994-08-30 1998-03-31 Plessey Semiconductors Limited White clip circuit

Also Published As

Publication number Publication date
DE1562026A1 (en) 1970-07-30
DE1562026B2 (en) 1974-02-07
DE1562026C3 (en) 1974-08-29

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees