US2924655A - Device comprising a cathode-ray tube for producing a signal delay - Google Patents

Device comprising a cathode-ray tube for producing a signal delay Download PDF

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Publication number
US2924655A
US2924655A US638653A US63865357A US2924655A US 2924655 A US2924655 A US 2924655A US 638653 A US638653 A US 638653A US 63865357 A US63865357 A US 63865357A US 2924655 A US2924655 A US 2924655A
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United States
Prior art keywords
signal
cathode
potential
target
scanning
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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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US638653A
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English (en)
Inventor
Teer Kees
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/58—Tubes for storage of image or information pattern or for conversion of definition of television or like images, i.e. having electrical input and electrical output
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/78—Tubes with electron stream modulated by deflection in a resonator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system
    • H04N11/165—Decoding means therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/40—Circuit details for pick-up tubes
    • 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
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards

Definitions

  • FIG.2 DEVICE COMPRISING A CATHQDE-RAY TUBE FOR PRODUCING A SIGNAL DELAY Filed Feb. 6, 1957 6 7 B 1 K a 2 ⁇ 5 "r9 d *l 4 5 5" 1a 7 I13 9 E FIG J CATHODE RAY TUBE 0 s S T 14 SIGNAL ADDING DEVICE- 16 I w Amie) AMPLIFIERV FIG.2
  • This invention relates to devices comprising arcathoderay tube with a target plate which'is scanned by the electron beam, to which tube an input signalzis supplied and from the output electrode, which is coupled to .the target, a signal is derived which comprises the difierence of a part of the input signal and a part of the input signal occurring a scanning-period earlier.
  • the cathoderay tube is of a type in which the target is scanned by high-velocity electrons, the scanning electrode consisting of photoemissive and secondary emissive material and being provided in an insulated manner on the output electrode.
  • the scanning electrode consisting of photoemissive and secondary emissive material and being provided in an insulated manner on the output electrode.
  • the potential of this element is brought substantially to the potential of the output electrode.
  • the input signal is supplied to the output electrode so as to produce also the aforesaid difference signal in the outputcircuit which is coupled to said output electrode.
  • this difference signal may be separated .fromzthe input-signal, additional steps should be taken and for thisvpurpose the scanning electron beam is interrupted in the rhythm of a high-frequency oscillation so that the difference signal in the output circuit is modulated on this highfrequency oscillation.
  • the present invention has for its object to provide a device in which the input signal and the desired difference signal are separated in a simple manner.
  • the device according to the invention has the feature that the cathode-ray tube is of a type in which the potential of an element of the target, on scanning this element, is caused substantially to assume the potential of the cathode of the tube, and the potential of the cathode is controlled by the input signal, while the potential of an element of the target rises, prior to scanning this element, to a value exceeding the cathode potential at the instant of this scan.
  • An advantageous form of the-device according to the invention has the feature that the cathode-ray tube is of the Vidicon type and the output electrode, which carries the target made from semi-conductive material, is supplied with a direct voltage exceeding the maximum amplitude of the input signal supplied to ;the.cathode of the tube.
  • FIG. 1 shows one form of the device according to the invention
  • Fig. 2 represents diagrammatically a part of a television receiver comprising the device according to the invention and adapted to receive dot interlace television signals or colour television signals, the signals comprising colour information being modulated onto an auxiliary carrier within the frequency-band of the brightness signals.
  • the device according to the invention as shown in Fig. 1 comprises a tube 1 of the Vidicon type.
  • the cathode 2 of this tube is earthed through a resistor 3.
  • control-grid 4 is negatively biassed in known manner.
  • the accelerating "electrode 5" is maintained to be at ;8 constant “potential of, say, approximately 300 volts.
  • a focussing electrode 6 which, together with a 'focussing .coil”7, focusses the electron-beam, also 'has a constant potential, for example-of from "200 to 300 volts.
  • An electrode .8 serves as the *dece'lerator and has the'same potential as that of the electrode 6.
  • a target 9 consisting of semi-conducting material is provided "on an output electrode 10. This output :electrode is connected through a resistor 11 to the positive terminal of a battery 12, the negative terminal of which is earthed.
  • the battery voltage may, for examp'leQbe 30volts.
  • the target 9 is scanned by-deflecting the electronbeam by means of a defiection coil-system 13. With the aid of this deflecting system either the whole target or a part of the target or again a line of the target or any other desired-pattern can be scanned in 'known manner. It will 'be assumedthat the time elapsing between'two scans of a same element of the target is T sec., T being, for example, or sec.
  • the input signal which depends-on the time t and will be represented by S(t), is supplied via a capacitor 18 to the resistor 3 connected in'the cathode circuit.
  • the maximum amplitude of the signal across the resistor 3 should be smaller than the voltage of'the battery 12.
  • the signal S(t) S(tT) may, for example, be used in a television transmitter in order to transmit information only relating to variations of the image to be transmitted, so that repeated transmission of non-varying parts of the image is avoided.
  • the signal S(t)S(t-T) may be used in radar receivers in order to distinguish between moving and stationary objects.
  • auxiliary carrier is within the frequency-band of the brightness signals, such as, for example, in the United States colour television system.
  • asis knownythe signal supplied to the picture tube also comprises the auxiliary carrier. If this auxiliary carrier occurs in a given line of, say, the even raster in a given phase, it appears in the same line of the next even raster in the opposite phase. Owing to persistence of vision, it may be expected that this appearance will not practically be perceptible, but as a result of stroboscopic effects it is found, in practice, that this is not entirely true and such an auxiliary carrier, although perceptible to a lesser degree as a result of the aforesaid phase relationship, yet invariably involves a troublesome effect.
  • the integration performed by the eye may advantageously be taken over by an arrangement, comprising a device according to the invention.
  • this permits a better reproduction in a simple manner.
  • Such a device may be inserted in the channel supplying the video signal to the picture tube of a television receiver, which may otherwise be of known and irrelevant construction.
  • the signal S(t) is supplied to a device 14 of a type according to the invention so as to produce a signal aS(t)bS(tT) at the output of this device.
  • the signal S(t) is also supplied to an amplifier 15 having an amplification factor (a+b) in which the polarity is moreover reversed so that the amplification is -(a-
  • the output signals of the devices 14 and 15 are added in the device 16 and, if desired, reversed in polarity so that a signal b[S(t) +S(t--T)] appears at the output of the device 16, which signal is supplied to a picture tube 17.
  • the auxiliary carrier has a phase opposite to that of the auxiliary carrier of the signal S(t), this auxiliary carrier will not be present in the signal supplied to the picture tube. If the time period T, in which the auxiliary carrier varies in phase by 180", corresponds to the picture frequency, then T will be chosen to be sec.
  • the delay time T will likewise be made such that, in accordance with the nature of the transmission system, the integration otherwise performed by the eye is taken over by the device according to the invention.
  • the use of such a device in a television receiver does not impose stringent additional requirements, since the cathode-ray tube may be of simple construction and the required deflection currents may be taken from deflection devices initially present in the receiver. Moreover, this deflection need not satisfy stringent requirements such as are usual in the reproducing device, it being only necessary for the scanning period T to be the same for each picture element. Finally, the material of the target 9 need not be photoconductive in the device according to the invention.
  • a cathode-ray device comprising a cathode for providing an electron beam, means for applying an input signal to said cathode, a target plate, means for causing said electron beam to repetitively scan said target plate, means connected to bias said target plate at a positive potential with respect to said cathode, and means connected to derive an output signal from said target plate simultaneously with the signal scanning thereof, said target plate being made of a material capable of temporarily storing voltage charges on elemental areas thereof so that each elemental area assumes substantially the instantaneous signal potential of said cathode at the moment of being scanned by said electron beam, the potential of each said elemental area rising towards said positive potential between the scansions thereof, whereby said output signal comprises the ditference between the present scanning signal and the signal of the next preceding scansion, said target plate comprising a semi-conductive material, and said bias means having a positive potential greater than the maximum amplitude of said input signal.
  • a cathode-ray device comprising a cathode for providing an electron beam, means for applying said video signal to said cathode, a target plate, means for causing said electron beam to repetitively scan said target plate, means connected to bias said target plate at a positive potential with respect to said cathode, means connected to derive an output signal from said target plate simultaneously with the signal scanning thereof, said target plate being made of a material capable of temporarily storing voltage charges on elemental areas thereof so that each element area assumes substantially the instantaneous signal potential of said cathode at the moment of being scanned by said electron beam, the potential of each said elemental area rising towards said positive potential between the scansions thereof, whereby said output signal comprises the difierence between the present scanning signal and the signal of the next preceding scansion, means for combining said output signal with said video signal with a polarity to cause compensation of said interference signals, and means for supplying

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US638653A 1956-02-18 1957-02-06 Device comprising a cathode-ray tube for producing a signal delay Expired - Lifetime US2924655A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL273414 1956-02-18

Publications (1)

Publication Number Publication Date
US2924655A true US2924655A (en) 1960-02-09

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US638653A Expired - Lifetime US2924655A (en) 1956-02-18 1957-02-06 Device comprising a cathode-ray tube for producing a signal delay

Country Status (7)

Country Link
US (1) US2924655A (en, 2012)
BE (1) BE555084A (en, 2012)
CH (1) CH346241A (en, 2012)
DE (1) DE1061819B (en, 2012)
FR (1) FR1166336A (en, 2012)
GB (1) GB836446A (en, 2012)
NL (2) NL273414A (en, 2012)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2211145A (en) * 1935-09-24 1940-08-13 Emi Ltd Picture transmitter
US2303924A (en) * 1939-03-07 1942-12-01 Emi Ltd Television transmitting or receiving system
US2527632A (en) * 1948-01-29 1950-10-31 Bell Telephone Labor Inc Storage tube
US2547386A (en) * 1949-03-31 1951-04-03 Bell Telephone Labor Inc Current storage device utilizing semiconductor
US2617963A (en) * 1949-05-26 1952-11-11 Int Standard Electric Corp Storage tube system
US2700151A (en) * 1949-10-28 1955-01-18 Rca Corp Electrical pulse analyzer
US2702356A (en) * 1951-05-08 1955-02-15 Rca Corp Signal storage system
USRE24070E (en) * 1948-01-29 1955-10-04 pierce
US2786880A (en) * 1951-06-16 1957-03-26 Bell Telephone Labor Inc Signal translating device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2211145A (en) * 1935-09-24 1940-08-13 Emi Ltd Picture transmitter
US2303924A (en) * 1939-03-07 1942-12-01 Emi Ltd Television transmitting or receiving system
US2527632A (en) * 1948-01-29 1950-10-31 Bell Telephone Labor Inc Storage tube
USRE24070E (en) * 1948-01-29 1955-10-04 pierce
US2547386A (en) * 1949-03-31 1951-04-03 Bell Telephone Labor Inc Current storage device utilizing semiconductor
US2617963A (en) * 1949-05-26 1952-11-11 Int Standard Electric Corp Storage tube system
US2700151A (en) * 1949-10-28 1955-01-18 Rca Corp Electrical pulse analyzer
US2702356A (en) * 1951-05-08 1955-02-15 Rca Corp Signal storage system
US2786880A (en) * 1951-06-16 1957-03-26 Bell Telephone Labor Inc Signal translating device

Also Published As

Publication number Publication date
NL273414A (en, 2012)
CH346241A (de) 1960-05-15
DE1061819B (de) 1959-07-23
FR1166336A (fr) 1958-11-05
BE555084A (en, 2012)
NL113240C (en, 2012)
GB836446A (en) 1960-06-01

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