US2011737A - Apparatus for picture transmission - Google Patents

Apparatus for picture transmission Download PDF

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Publication number
US2011737A
US2011737A US451667A US45166730A US2011737A US 2011737 A US2011737 A US 2011737A US 451667 A US451667 A US 451667A US 45166730 A US45166730 A US 45166730A US 2011737 A US2011737 A US 2011737A
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US
United States
Prior art keywords
picture
receiver
sender
velocity
splitting
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Expired - Lifetime
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US451667A
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English (en)
Inventor
Thun Rudolph
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Individual
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Individual
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Publication of US2011737A publication Critical patent/US2011737A/en
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    • 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
    • H04N3/32—Velocity varied in dependence upon picture information

Definitions

  • the fineness of the subdivision is uniform throughout the area of the picture,-or substantially so.
  • The; problem'- may be solved in various ways, forinstance, by "arcuating relays through the medium of resonance circuits which in turn influence thesplitting-up velocity.
  • The'means for performing my method may include a control "strip-like the stripsor. bands which are used in the ,copying of acinematograph filmsor for the shuttle controlin looms.
  • the control strip may beare op r rep odu ti n t e p tu es to be transmitted, for 1 instan e, a copy which isxwithput the perfect definition of the original, .or a
  • the splitting-up velocity is regulated by a strip which is a copyof mega ture' to be transmitted.
  • TIhe variation off the splitting-up velocity may be impressed on a funf damental oscillation which may serve forsy'nj chronization at the same time.”
  • the last-mentioned method may be modified as follows: At the 're'ceiver'the intensity of [the picture generating spot remains constant butthe spot is moved at higher speed across the iiarh'er elements and at. lower speed across. the lighter elements. The apparent 'intensity'oi the picture elements is then inversely proportional 'tothe velocity of the spot, that is, it is a functionof the differential coeificient g2 dt in a diagramin which the velocity 6 of light spot is plotted against time t. i
  • the splitting-up velocity is a function of the properties of the picture elements,as willbeunderstood from the following consideration:
  • the modulation to be transmitted was a function of the variation of intensity related to the ordinate, while in my rneth-, 0d which may be termed the coordinate control, the modulation to be transmitted is the in- 't egral ofthis function. If this function is dissender and a receiver,
  • Y V a a Fig; l is a diagram, of a systemincluding a method may 'be performed are illustrated dia- Figl2 is a diagram oia modified sender, and h Fig. 3 is a diagram of a receiver for this sender.
  • V Referring, now, to the drawings, and first to Fig.”1,::lj is fthffilm time transmitted, 2 is a feedingdrurn' on'a shaft 3, and l? isla motor or othermechanismior imparting rotation to the, drum 2.
  • the sh t ner y is induced-in theooil asoften astthe film Lha'sbeenmoved f0r1the termed, th i im'ary splittingup i.
  • Q13 isja'n m nfier' in the] circuit
  • Qithe galvanome'ter which controls-the mirror 6.
  • i5 is' a filter which maybe inserted between 'theffilm I and thefcell 'n-brderZtol'compensate? the variation at; the
  • I filter being suitablyselectedlf I sy temitr11ens sor rriirrons, for optical mfiipensauon Ah' 'aerialipicture is generated at a .2! and ,projec ed fonto a screen 23 through the objectiveizzf.
  • the medium of a wheelj25 on the shaft 2A with. magnets orironpoles-ZB. 2'! is a magnet which jcooperates the wheel 25..
  • the condenser-'34 By the condenser-'34 theiintensity values or one row are integrated-and at the end o'feach row -'-the int'egral value is reduced to zeropso thatthe integr'ation can be'gre star tedat: the beginning:of thefne'xt row.
  • the modulation at the tube 42; is'therefo're' equal to the modulationefiected bythe photo-electric cell- 32 or the tube 33 so that thefglow lamp 43 in combination withp-thelNipkow' disc 44' operates.likeiany one of 7'? :the usual 1 television receivers 3 with" *intensity '
  • This arrangement has jaf twofold advantage as increased so that the modulation supplied by the,
  • tube 38 is particularly suitable for operating a 5 the convergence of the series representing the synchronizing apparatus of known type..
  • the novel method has the admeans described. It is also possible to adapt the "vantage that the equipments of the sender and the'receiver are the same as are used for the known methods of intensity control and only 'require completion by the additional amplifier methoddescribed only to the receiver or only I [to :the sender, sothat amplifier means havinga 20 1 case the equipment including the tube' 33, the
  • tubeA3 and the intermediate parts is arranged lower range of frequency may be used.
  • the sender or at the receiver and that part of the amplifier means which is undesirably influenced by the frequency is arranged intermediate the tubes 36 ,to 38.
  • the condenser 34 may be short-circuited inaccordance wlth the movement of the Nipkow disc 44 or by any known throw-over switch, or if exceptionally high receiving amplitudes are encountered.
  • the latter "system will particularly be adapted if a synchronous signal is transmitted at exceptionally 1 high amplitude.
  • An apparatus fortransmitting pictures at a distance by splitting-up and recombining comprising a sender at a transmitting station, and a receiver ata receiving station, a photo-electric cell'at. the transmitting'station, meansfor con- 7 receiver, and a current generator at the transmitting station controlledlby the tone of the picture tinuouslymoving past said cell the picture to be split up, a circuit connected to said cellgmeans 7 connected to said circuit for projecting a pencil *of light through the picture onto said cell, means in 7 said circuit adapted to impart continuous movement to saidprojecting means and to be infiuenced by the conductivity of said cell under the varying intensities of light admitted to said cell, for varying the velocity of the continuous movement of said projecting means in conformity with the tone of the picture, and means at the receiving station adapted to be controlled by said regulating means for operatingv the receiver,
  • the method of transmitting pictures over a distance which comprises-developing a light beam, scanning a picture with a continuously "moving light beam, converting the light impulses into an electrical impulse'and varying the velocity of the scanning light beam at the transmitter and receiver in'accordance with the tone value of the picture.
  • the method of transmitting pictures over a distance which comprises developing a light :beam, scanning a picture with a' continuously moving light beam, converting the light impulses into an electrical impulse and varying the velocity of the scanning light beam at the transmitter and receiver in accordance with the tone value of the picture, the electrical control of said light beam being efiected in dependency upon the value of an electrical quantity, the instantanea o-us value of which depends upon the instantaneous deflection of the beam and the first derivative with respect of the time of which is proand receiver in accordance with the tone value of the picture, the electrical control of said light beam being effected in dependency upon the value of an electrical quantity, the instantaneous value of which depends upon the instantaneous deflection of the beam and the first derivative with respect of the time of which is proportional to the tone of the picture, the values of the electrical quantity being transmitted to the receiving station and the light beam at the receiving station being controlled by the values of the quantity. 7 r
  • An apparatus for transmitting pictures at a distance by splitting-up and recombining comprising a sender at a transmitting station, and
  • a receiverat'a receiving station scanning means for splitting up the pictures at the sender, scanning means for recombining them at the receiver, means for imparting continuous movement'to said scanning means at the sender and at the receiver, and means at thetransmitting station for'splitting up the pictures at the sender, scanning means for recombining them at the receiver,
  • An apparatusfortransmitting pictures at a distance by splitting-up and recombining comprising a sender and a receiver, scanning means for splitting up the pictures at the sender, scansaid scanning means at the sender and at the .receiver, a'photo-electric element at the transmitting station which is controlled by'the tone of the picture, and means controlled by the photo cell for varying the velocity of the continuous movementof said scanning means at the transmitter and receiver.
  • ning means for recombining them at the receiver

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Eye Examination Apparatus (AREA)
  • Networks Using Active Elements (AREA)
US451667A 1929-05-18 1930-05-12 Apparatus for picture transmission Expired - Lifetime US2011737A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE355319X 1929-05-18
DE618976T 1930-02-21

Publications (1)

Publication Number Publication Date
US2011737A true US2011737A (en) 1935-08-20

Family

ID=34827953

Family Applications (1)

Application Number Title Priority Date Filing Date
US451667A Expired - Lifetime US2011737A (en) 1929-05-18 1930-05-12 Apparatus for picture transmission

Country Status (5)

Country Link
US (1) US2011737A (fr)
BE (1) BE370378A (fr)
DE (2) DE618976C (fr)
FR (2) FR695622A (fr)
GB (2) GB355319A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523156A (en) * 1947-06-12 1950-09-19 Rca Corp Vertical sweep voltage correction for film movement in flying spot scansion
US2601505A (en) * 1949-03-23 1952-06-24 Zenith Radio Corp Subscription type television transmitter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547598A (en) * 1947-09-13 1951-04-03 Zenith Radio Corp Subscription image transmission system and apparatus
GB858346A (en) * 1956-11-20 1961-01-11 Nat Res Dev Improvements in or relating to television, facsimile and like signal transmission systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523156A (en) * 1947-06-12 1950-09-19 Rca Corp Vertical sweep voltage correction for film movement in flying spot scansion
US2601505A (en) * 1949-03-23 1952-06-24 Zenith Radio Corp Subscription type television transmitter

Also Published As

Publication number Publication date
FR695622A (fr) 1930-12-18
FR39782E (fr) 1932-03-18
DE575355C (de) 1933-04-27
GB377175A (en) 1932-07-19
GB355319A (en) 1931-08-17
DE618976C (de) 1935-09-26
BE370378A (fr)

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