GB1516375A - Variable interlace display - Google Patents

Variable interlace display

Info

Publication number
GB1516375A
GB1516375A GB4550875A GB4550875A GB1516375A GB 1516375 A GB1516375 A GB 1516375A GB 4550875 A GB4550875 A GB 4550875A GB 4550875 A GB4550875 A GB 4550875A GB 1516375 A GB1516375 A GB 1516375A
Authority
GB
United Kingdom
Prior art keywords
rate
interlace
vco
frequency
counter
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
GB4550875A
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.)
American Optical Corp
Original Assignee
American Optical 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
Application filed by American Optical Corp filed Critical American Optical Corp
Publication of GB1516375A publication Critical patent/GB1516375A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
    • H01J37/28—Electron or ion microscopes; Electron or ion diffraction tubes with scanning beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Details Of Television Scanning (AREA)

Abstract

1516375 Television AMERICAN OPTICAL CORP 31 Oct 1975 [20 Dec 1974] 45508/75 Heading H4F Apparatus for changing the interlace rate of a rastered display device e.g. in a scanning electron microscope system, and thereby improve the displayed image resolution, comprises a VCO 42 generating a frequency which is a multiple of the horizontal deflection rate and the desired interlace ratios, a counter 50 which reduces the VCO frequency to a frequency equal to the horizontal rate for the desired interlace rate, and a counter 54 which reduces the VCO frequency to a frequency equal to the vertical rate for the desired interlace rate, the counter 54 and thus the VCO being controlled 56 so that the dividend H/V of the horizontal rate H and vertical rate V is a fractional number the fractional portion of which represents the desired interlace rate. H/V equals the number of lines per field and thus if H/V = 262 1/n then the interlace rate is n:1. The VCO is preferably phase-locked 44 to the frequency of the main power supply for the display e.g. 60 Hz. The counter 54 is controlled by variable Modulo control 56. An example is described for changing the interlace ratio between 1:1, 2:1, 4:1, 8:1 and 16:1, and a second example for interlace ratios 1:1, 2:1,3:1,4:1 and 5:1.
GB4550875A 1974-12-20 1975-10-31 Variable interlace display Expired GB1516375A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US53497574A 1974-12-20 1974-12-20

Publications (1)

Publication Number Publication Date
GB1516375A true GB1516375A (en) 1978-07-05

Family

ID=24132308

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4550875A Expired GB1516375A (en) 1974-12-20 1975-10-31 Variable interlace display

Country Status (3)

Country Link
JP (1) JPS6234193B2 (en)
DE (1) DE2548831C2 (en)
GB (1) GB1516375A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3103906A1 (en) * 1981-02-05 1982-09-09 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt METHOD FOR TRANSMITTING TELEVISION SIGNALS OVER A STANDARDIZED BANDWIDTH-LIMITED TRANSMISSION CHANNEL AND ARRANGEMENT FOR CARRYING OUT THE METHOD

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1804492A1 (en) * 1967-10-23 1970-02-26 Telemation Television sync generator and method for generating television sync signals
US3766427A (en) * 1970-06-15 1973-10-16 American Optical Corp Field emission electron gun
US3678333A (en) * 1970-06-15 1972-07-18 American Optical Corp Field emission electron gun utilizing means for protecting the field emission tip from high voltage discharges
DE2138737C3 (en) * 1971-08-03 1974-01-10 Siemens Ag, 1000 Berlin U. 8000 Muenchen Pulse generator that can be adapted to television systems of different standards
US3767926A (en) * 1972-05-08 1973-10-23 American Optical Corp Field emission scanning microscope display

Also Published As

Publication number Publication date
DE2548831A1 (en) 1976-06-24
DE2548831C2 (en) 1985-11-14
JPS6234193B2 (en) 1987-07-24
JPS5186356A (en) 1976-07-28

Similar Documents

Publication Publication Date Title
US4736246A (en) Stereoscopic video display system
MY105289A (en) Vertical zoom and panning for television.
JP2000036964A (en) Central control system for plural vertical formats
MY106268A (en) Methods of and apparatus for generating correction waveform for an image display.
KR100312710B1 (en) Clock pulse generator for digital imaging system
US4012592A (en) AC line triggered refreshing of CRT displays
US5166801A (en) Large size display apparatus for high definition television
KR900019501A (en) Teletext receiver
GB1516375A (en) Variable interlace display
GB1498909A (en) Purity adjustment for colour display system
JPH0715704A (en) Image receiver
US4047204A (en) Variable interlace display
US4054919A (en) Video image positioning control system
GB1338346A (en) Television special effects control pulse-generating apparatus
ES421937A1 (en) Television display apparatus provided with a circuit arrangement for generating a sawtooth current through a line deflection coil
US2525102A (en) Television synchronizing signal generator
US3582963A (en) Frequency controllable synchronizing generator for television systems
KR100587542B1 (en) Synchronized high voltage generator
ES8102359A1 (en) Device for displaying an analog signal on a display screen.
US3716749A (en) Display system to generate symbols formed of conic sections
GB1428156A (en) Systems for the visual display of coded information
GB845440A (en) Improvements in or relating to monitors for use in television equipment
MY110315A (en) Horizontal blanking for multiple rate scanning
KR840004652A (en) High definition TV
GB1087267A (en) Display

Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19951030