GB1020008A - A scanning system for a cathode ray tube - Google Patents

A scanning system for a cathode ray tube

Info

Publication number
GB1020008A
GB1020008A GB4615462A GB4615462A GB1020008A GB 1020008 A GB1020008 A GB 1020008A GB 4615462 A GB4615462 A GB 4615462A GB 4615462 A GB4615462 A GB 4615462A GB 1020008 A GB1020008 A GB 1020008A
Authority
GB
United Kingdom
Prior art keywords
pulse
pulses
staircase
ray tube
line
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
GB4615462A
Inventor
John Loras Sweeney
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 Business Machines Corp
Original Assignee
International Business Machines 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
Priority to US863231A priority Critical patent/US3116436A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to GB4615462A priority patent/GB1020008A/en
Publication of GB1020008A publication Critical patent/GB1020008A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/34—Elemental scanning area oscillated rapidly in direction transverse to main scanning direction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
    • H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
    • H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
    • H04N3/2335—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements with calculating means

Landscapes

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

Abstract

1,020,008. Television; staircase waveform generators. INTERNATIONAL BUSINESS MACHINES CORPORATION. Dec. 6, 1962, No. 46154/62. Headings H3P and H4F. In a scanning system for a cathode-ray tube, a set of auxiliary pulses is produced at the time of each horizontal line, the pulses being counted by a chain 22 of bistable trigger circuits, the output of which is converted in a decoder 24 to a staircase vertical deflection waveform. If the line/frame ratio is not an exact multiple of the number of pulses in each set the system will interlace at a rate corresponding to the number of pulses per set. Interlacing.-The Specification refers to double, triple and quadruple interlaced rasters and describes a triple interlaced system having eleven frames/second (33 fields/second) and 761 lines/frame. A pulse P1 is generated at the start of each spaced sawtooth horizontal sweep at 16, a further pulse P2 at the end of each sweep and a third pulse P3 at the end of each flyback. Each pulse P1, P2, P3 advances the counter 22 by one unit until a count of 897 is reached when the counter is reset by the AND gate 26 and an amplifier 28. (897 - 136=the line/frame ratio, 761.) Staircase wave generators.-The triggers 22 are each connected to a digital/analogue converter (Fig. 5). Temperature-compensated resistor 44 connected to the tenth trigger T10 is arranged to pass one half of the maximum output current of the decoder 24 whilst the values of the other resistors 40, 42 &c. are weighted on a binary scale. Diodes 46, 48, 50 become non- conductive when the corresponding trigger is in its " 1 " state, diverting an appropriate current from the relevant diode 52, 54, 46 to the output terminal 58. The staircase waveform thus produced during each count is amplified at 12 and fed to vertical deflecting plates or coils on a cathode-ray tube 14.
GB4615462A 1959-12-31 1962-12-06 A scanning system for a cathode ray tube Expired GB1020008A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US863231A US3116436A (en) 1959-12-31 1959-12-31 Raster scanning system
GB4615462A GB1020008A (en) 1962-12-06 1962-12-06 A scanning system for a cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4615462A GB1020008A (en) 1962-12-06 1962-12-06 A scanning system for a cathode ray tube

Publications (1)

Publication Number Publication Date
GB1020008A true GB1020008A (en) 1966-02-16

Family

ID=10440081

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4615462A Expired GB1020008A (en) 1959-12-31 1962-12-06 A scanning system for a cathode ray tube

Country Status (1)

Country Link
GB (1) GB1020008A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4915314A (en) * 1972-05-17 1974-02-09
EP0142244A1 (en) * 1983-09-15 1985-05-22 Sinclair Research Limited Television receivers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4915314A (en) * 1972-05-17 1974-02-09
EP0142244A1 (en) * 1983-09-15 1985-05-22 Sinclair Research Limited Television receivers

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