GB783346A - Improvements in or relating to valve circuits for phase-amplitude characteristic correction - Google Patents

Improvements in or relating to valve circuits for phase-amplitude characteristic correction

Info

Publication number
GB783346A
GB783346A GB146855A GB146855A GB783346A GB 783346 A GB783346 A GB 783346A GB 146855 A GB146855 A GB 146855A GB 146855 A GB146855 A GB 146855A GB 783346 A GB783346 A GB 783346A
Authority
GB
United Kingdom
Prior art keywords
amplifier
linear
phase
valve
signal amplitude
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
GB146855A
Inventor
Victor James Cooper
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB146855A priority Critical patent/GB783346A/en
Publication of GB783346A publication Critical patent/GB783346A/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
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

783,346. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 4, 1955 [Jan. 18, 1955], No. 1468/55. Class 40(6). An amplifier in which the phase-shift/frequency characteristic is a function of signal amplitude comprises a valve 5 with non-linear anode and cathode impedances A, K respectively. As shown, each impedance comprises a resistor A2, K2, respectively shunted by a rectifier A3, K3 in series with a blocking condenser A5, K5. The circuit elements are so chosen and the biases applied to the rectifiers from potentiometers A4, K4 so set that for low frequencies the distortions introduced by the networks A, K balance out and the amplifier is linear. At higher frequencies, however, an additional condenser A1 shunting the anode load destroys the balance and causes the phaseshift to vary with signal amplitude. Additional variable resistors A6, K6 may be used in order to obtain a desired characteristic. As shown, the amplifier is preceded by a cathode-follower 2 with D.C.-restoring diode 3 in its grid circuit. The arrangement is more particularly intended for use in colour picture transmission, to apply correction for non-linear phase distortion produced in the modulator.
GB146855A 1955-01-18 1955-01-18 Improvements in or relating to valve circuits for phase-amplitude characteristic correction Expired GB783346A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB146855A GB783346A (en) 1955-01-18 1955-01-18 Improvements in or relating to valve circuits for phase-amplitude characteristic correction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB146855A GB783346A (en) 1955-01-18 1955-01-18 Improvements in or relating to valve circuits for phase-amplitude characteristic correction

Publications (1)

Publication Number Publication Date
GB783346A true GB783346A (en) 1957-09-25

Family

ID=9722519

Family Applications (1)

Application Number Title Priority Date Filing Date
GB146855A Expired GB783346A (en) 1955-01-18 1955-01-18 Improvements in or relating to valve circuits for phase-amplitude characteristic correction

Country Status (1)

Country Link
GB (1) GB783346A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245539A (en) * 1990-06-28 1992-01-08 B & L Corp Screw-type jack

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2245539A (en) * 1990-06-28 1992-01-08 B & L Corp Screw-type jack
GB2245539B (en) * 1990-06-28 1994-04-06 B & L Corp Screw-type jack

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