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GB1475609A - Gamma circuit - Google Patents

Gamma circuit

Info

Publication number
GB1475609A
GB1475609A GB2518974A GB2518974A GB1475609A GB 1475609 A GB1475609 A GB 1475609A GB 2518974 A GB2518974 A GB 2518974A GB 2518974 A GB2518974 A GB 2518974A GB 1475609 A GB1475609 A GB 1475609A
Authority
GB
United Kingdom
Prior art keywords
transistors
output
transistor
circuit
amplifier
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
GB2518974A
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
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 Tokyo Shibaura Electric Co Ltd filed Critical Tokyo Shibaura Electric Co Ltd
Publication of GB1475609A publication Critical patent/GB1475609A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control
    • 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
    • H04N9/69—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

1475609 Gamma correction circuits TOKYO SHIBAURA ELECTRIC CO Ltd 6 June 1974 [12 June 1973] 25189/74 Heading G4G A gamma correction circuit for a television system comprises an amplifier, transistors 13, 17, receiving a D.C. video signal E i at least one diode, or diode-connected transistors 21 to 23, connected to the amplifier output at one end and to the output of an emitter follower circuit, in this case a cascade of such circuits 24 to 26, at the other end, the output E 0 being taken from the collector of transistor 17. The form of the exponential function generated is determined by a control voltage E 3 on the base of transistor 26. Transistors 21 to 23 and 24 to 26 have complementary temperature variations to provide a temperature-compensated circuit. Transistor 16 and its associated components constitute a clamping circuit to provide the D.C. input signal E i . In Fig. 1, (not shown) a single transistor (1) constitutes the amplifier and across the output thereof are resistors (3, 4) in series with diodes (5,6) connected to the emitters of emitter-follower transistors (7, 8) each having a respective control signal (E 1 , E2) connected to its base.
GB2518974A 1973-06-12 1974-06-06 Gamma circuit Expired GB1475609A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48066217A JPS5843947B2 (en) 1973-06-12 1973-06-12 Gamma Cairo

Publications (1)

Publication Number Publication Date
GB1475609A true GB1475609A (en) 1977-06-01

Family

ID=13309429

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2518974A Expired GB1475609A (en) 1973-06-12 1974-06-06 Gamma circuit

Country Status (4)

Country Link
JP (1) JPS5843947B2 (en)
CA (1) CA1026453A (en)
GB (1) GB1475609A (en)
NL (1) NL161022C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62123248U (en) * 1986-01-30 1987-08-05
CN109074360B (en) 2016-04-12 2022-05-03 谷歌有限责任公司 Reducing latency in downloading electronic resources using multiple threads

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441663A (en) * 1965-05-04 1969-04-29 Photo Electronics Corp Non-linear amplifiers and systems

Also Published As

Publication number Publication date
NL161022B (en) 1979-07-16
DE2428489B2 (en) 1976-03-18
NL161022C (en) 1979-12-17
JPS5843947B2 (en) 1983-09-30
NL7407756A (en) 1974-12-16
CA1026453A (en) 1978-02-14
DE2428489A1 (en) 1975-01-09
JPS5017124A (en) 1975-02-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee