GB774390A - Improvements to television circuits and the like - Google Patents

Improvements to television circuits and the like

Info

Publication number
GB774390A
GB774390A GB5303/54A GB530354A GB774390A GB 774390 A GB774390 A GB 774390A GB 5303/54 A GB5303/54 A GB 5303/54A GB 530354 A GB530354 A GB 530354A GB 774390 A GB774390 A GB 774390A
Authority
GB
United Kingdom
Prior art keywords
cathode
signal
level
pulses
feb
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
GB5303/54A
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.)
SOC NOUVELLE OUTIL RBV RADIO
Original Assignee
SOC NOUVELLE OUTIL RBV RADIO
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 SOC NOUVELLE OUTIL RBV RADIO filed Critical SOC NOUVELLE OUTIL RBV RADIO
Publication of GB774390A publication Critical patent/GB774390A/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
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level

Landscapes

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

Abstract

774,390. Television. SOC. NOUVELLE DE L'OUTILLAGE R.B.V. ET DE LA RADIOINDUSTRIE. Feb. 23, 1954 [Feb. 26, 1953], No. 5303/54. Class 40 (3). In a circuit arrangement for " clipping " the signal from a television camera during retrace periods (to provide a stable level for the insertion of synchronizing pulses) the. camera signal is fed to a cathode-follower stage, the cathode output of which is supplied to a biased limiting device (which " clips " the signal) and the control grid of which is clamped to a predetermined potential (which may be adjustable) during retrace periods. As shown in Fig. 4, the control grid of the cathode follower stage V3, which is supplied with the video signal A (Fig. 1), after amplification and phase inversion in V5, together with negatively-going blanking pulses B, is clamped to a potential determined by the setting of potentiometer P<SP>1</SP> by means of the diodes V6, V7 which are rendered conductive during the occurrence of the " back-porch" by means of clamping pulses F. The output of V3, developed across the cathode resistor R2, is then " clipped " at a level D by means of diode V4, the limiting action of which is determined by a low impedance voltage source 13. In this manner a constant clipping level D is maintained irrespective of operation of the (blacklevel) control potentiometers P1 and of supply voltage variations.
GB5303/54A 1953-02-26 1954-02-23 Improvements to television circuits and the like Expired GB774390A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR774390X 1953-02-26

Publications (1)

Publication Number Publication Date
GB774390A true GB774390A (en) 1957-05-08

Family

ID=9199863

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5303/54A Expired GB774390A (en) 1953-02-26 1954-02-23 Improvements to television circuits and the like

Country Status (1)

Country Link
GB (1) GB774390A (en)

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