US2265825A - Impulse segregation circuits - Google Patents

Impulse segregation circuits Download PDF

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Publication number
US2265825A
US2265825A US229254A US22925438A US2265825A US 2265825 A US2265825 A US 2265825A US 229254 A US229254 A US 229254A US 22925438 A US22925438 A US 22925438A US 2265825 A US2265825 A US 2265825A
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United States
Prior art keywords
impulse
frame
deflection
line
impulses
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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 - Lifetime
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US229254A
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English (en)
Inventor
Urtel Rudolf
Geiger Max
Andrieu Robert
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Telefunken AG
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Telefunken AG
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Publication date
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Publication of US2265825A publication Critical patent/US2265825A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa

Definitions

  • the line deflection or the frame or the line series generator or time-base are controlled from the incoming mixture of synchronizing signals or impulses.
  • the various signals which actuate these two deflector means distinguish themselves in all conventional systems essentially by their time duration or length; in fact, the frame impulses are much longer than the line impulses.
  • the mixture or spectrum of impulses is simultaneously fed to both deflector means.
  • the line deflection generator or oscillator reacts to line impulses in a way well known in the art.
  • the time-constant which is decisive for and determines the actuation of the picture or frame deflection generator or line series deflection generator difiers only a very small amount from that of the line deflection generator with the result that the frame deflection or frame scan would be rendered operative also during the duration of the line scan impulse, but slightly later than the line deflection, if it were not for the fact that the frame scan means, according to the invention, are blocked.
  • This blocking of the frame deflection generator is effected by the aid of a voltage derived from the line deflection generator just working'at the time.
  • Fig. l is a set of explanatory curves.
  • Fig. '2 is one embodiment of our invention.
  • a. represents the incoming mixture of impulses; his the same mixture as brought to act at the frame deflection their efieet.
  • ⁇ i represents the voltage which actually controls the frame deflection generator.
  • the invention offers the further advantage that it will'be found useful in the handling of no matter what kinds of mixtures of short (line) and long (frame or picture) impulses may be concerned.
  • the impulse mixture is simultaneously fed by way of respective condensers to the grid of a Thyratron I for'line scan and of a Thyratron 2 for frame or picture scan.
  • a small RC mesh 3, 4 designed to slightly round or lap off the face of the impulse.
  • the plate leads are the resistances 5 and 6 through which are charged the condensers l and 8.
  • the time base or sweep means comprise two socalled blocking oscillators, that is to say, oscillator devices in which there is a'strong feedback between the plate and the grid circuit of the electronic tube.
  • the impulse mixture is applied to the resistance H and I2 in the grid circuit of the line deflector tube I0.
  • Tube I serves to cause release of the discharge of the condenser l being charged through the resistance I l; when the tube is blocked, the, condenser [E is slowly recharged.
  • the impulse mixture Upon the grid circuit of the frame deflection generator is impressed the impulse mixture by way of a small RC mesh comprising resistance II and condenser I3 which insures gentle rounding of the front of the impulses.
  • the frame deflection generator comprises a discharge vessel of the hexode type I6.
  • the first grid ll of the latter is included in the oscillatory circuit.
  • Its third grid I8 is blocked by a potential which arises in the line deflection generator upon the discharge of the condenser [5 across a resistance 19 being in series with the latter.
  • the sawtooth voltage waves arising at the condensers l5 and 20 serve for the control of the deflection or sweep of cathode-ray pencils.
  • Apparatus for generating deflecting signals for deflecting an electronic beam in two coordinates of deflection comprising a first means for storing electrostatic energy, a discharge path for said energy connected substantially in parallel with said aforementioned first storage means, means for rendering said first discharge path conducting in accordance with signals received from a source external to said apparatus, a second means for storing electrostatic energy, a discharge path connected substantially in parallel with said second electrostatic energy storage means, means for developing from said first discharge path a control potential when said path is rendered conducting by the signals from the external source, and means for impressing said control potential onto said second discharge path to control the discharge state thereof.
  • Apparatus for generating deflecting signals for deflecting an electronic beam in two coordinates of motion comprising means for receiving signals representative of each co-ordinate from a source external to the apparatus, a first relaxation oscillator comprising a first thermionic tube having anode, cathode and at least one control electrode,- means for storing electrostatic energy connected substantially in parallel with the anode-cathode path of said tube, means for impressing said signals from an external source onto the control electrode-cathode path of said tube, means for developing a pulse in accordance with the discharge of the energy in said electrostatic energy storage means, a second relaxation oscillator comprising a thermionic tube having anode, cathode and at least one control electrode, electrostatic ener y storage means connected in the anode-cathode path of said second thermionic tube, means for impressing said signals onto the control electrode-cathode path of said second thermionic tube and means for impressing the pulses developed within the first relaxation oscillator

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
US229254A 1937-06-29 1938-09-10 Impulse segregation circuits Expired - Lifetime US2265825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2265825X 1937-06-29

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US2265825A true US2265825A (en) 1941-12-09

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US229254A Expired - Lifetime US2265825A (en) 1937-06-29 1938-09-10 Impulse segregation circuits

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BE (1) BE428664A (en))
NL (1) NL51427C (en))

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449443A (en) * 1945-02-03 1948-09-14 Philip C Bettler Line pulse modulator for multichannel transmitters
US2473432A (en) * 1945-08-01 1949-06-14 Lawrence H Johnston Electronic square wave signal generator
US2477770A (en) * 1944-04-03 1949-08-02 Cutler Hammer Inc Electronic timing and recording means
US2512699A (en) * 1945-12-06 1950-06-27 Us Sec War Radio pulse receiver interference eliminator
US2541276A (en) * 1944-02-24 1951-02-13 Bell Telephone Labor Inc Differential control circuit
US2570836A (en) * 1947-10-18 1951-10-09 Du Mont Allen B Lab Inc Coincidence blocking tube oscillator
US2672556A (en) * 1950-09-26 1954-03-16 Robert B Leighton Electronic timing device
US2708241A (en) * 1946-01-30 1955-05-10 Bess Leon Wide gate generator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541276A (en) * 1944-02-24 1951-02-13 Bell Telephone Labor Inc Differential control circuit
US2477770A (en) * 1944-04-03 1949-08-02 Cutler Hammer Inc Electronic timing and recording means
US2449443A (en) * 1945-02-03 1948-09-14 Philip C Bettler Line pulse modulator for multichannel transmitters
US2473432A (en) * 1945-08-01 1949-06-14 Lawrence H Johnston Electronic square wave signal generator
US2512699A (en) * 1945-12-06 1950-06-27 Us Sec War Radio pulse receiver interference eliminator
US2708241A (en) * 1946-01-30 1955-05-10 Bess Leon Wide gate generator
US2570836A (en) * 1947-10-18 1951-10-09 Du Mont Allen B Lab Inc Coincidence blocking tube oscillator
US2672556A (en) * 1950-09-26 1954-03-16 Robert B Leighton Electronic timing device

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Publication number Publication date
BE428664A (en))
NL51427C (en))

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