GB755024A - Improvements in or relating to interference limiting circuits for television receivers - Google Patents

Improvements in or relating to interference limiting circuits for television receivers

Info

Publication number
GB755024A
GB755024A GB39754A GB39754A GB755024A GB 755024 A GB755024 A GB 755024A GB 39754 A GB39754 A GB 39754A GB 39754 A GB39754 A GB 39754A GB 755024 A GB755024 A GB 755024A
Authority
GB
United Kingdom
Prior art keywords
interference
cathode
triode
white
peak white
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
GB39754A
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB39754A priority Critical patent/GB755024A/en
Priority to FR1121574D priority patent/FR1121574A/en
Publication of GB755024A publication Critical patent/GB755024A/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
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)

Abstract

755,024. Television. GENERAL ELECTRIC CO., Ltd., and RIBCHESTER, E. Dec. 21, 1954 [Jan. 6, 1954], No. 397/54. Class 40 (3). In an interference limiting circuit for television receivers, a television signal with white extending in the negative direction is applied from the anode of the final video stage 1 to the cathode of cathode-ray tube 2 and is prevented from exceeding a value corresponding to peak white during an interference pulse by a biased triode 7 which conducts at peak white level to present a low impedance across anode load 10. Simultaneously a negative pulse appears across the triode anode load 15 and is applied to the cathode-ray tube modulator 11 so as to reduce the beam current. The effect of the pulse is limited, however, by a biased diode 12 and the arrangement is such that the total voltage applied to the cathode-ray tube corresponds to a value approximately half-way between peak white and black. The effect of the invention therefore is to cause interference pulses to produce spots intermediate black and white. By virtue of the amplification of triode 7, interference not greatly exceeding peak white produced on the screen spots considerably less than peak white. Triode 7 may be replaced by two valves, one to limit the signal across anode load 10 and the other to amplify interference signals. The levels at which the two valves become effective may differ. The circuit may be arranged for either positive or negative modulation of the received carrier. Typical circuit values are given.
GB39754A 1954-01-06 1954-01-06 Improvements in or relating to interference limiting circuits for television receivers Expired GB755024A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB39754A GB755024A (en) 1954-01-06 1954-01-06 Improvements in or relating to interference limiting circuits for television receivers
FR1121574D FR1121574A (en) 1954-01-06 1954-12-31 Anti-jamming circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB39754A GB755024A (en) 1954-01-06 1954-01-06 Improvements in or relating to interference limiting circuits for television receivers

Publications (1)

Publication Number Publication Date
GB755024A true GB755024A (en) 1956-08-15

Family

ID=9703668

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39754A Expired GB755024A (en) 1954-01-06 1954-01-06 Improvements in or relating to interference limiting circuits for television receivers

Country Status (2)

Country Link
FR (1) FR1121574A (en)
GB (1) GB755024A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463556A1 (en) * 1979-08-10 1981-02-20 Rca Corp CIRCUIT FOR INHIBITING RADIO FREQUENCY INTERFERENCE IN A TELEVISION RECEIVER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2463556A1 (en) * 1979-08-10 1981-02-20 Rca Corp CIRCUIT FOR INHIBITING RADIO FREQUENCY INTERFERENCE IN A TELEVISION RECEIVER

Also Published As

Publication number Publication date
FR1121574A (en) 1956-08-21

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