US2195676A - Television method and means - Google Patents

Description

2 Sheets-Sheet 1 ilAmPlf.

J. McCARTY TELEVISION METHOD AND MEANS Filed Feb. l5, 1937 April 2, 1940.

April 2, 1940. J. MccARTY TELEVISION METHOD AND MEANS Filed Feb. l5, 193'? 2 Sheets-Sheet 2 Snnentor 8g James Mc.Car

`Patenteri i940 l f l t it 'I S'lc'iES ATEN OFFICE 2,195,676v n p l TELEVISIQN METHOD AND MEANS James McCarty, Omaha, Nebl'. sppiioanon February 15, 1937, serial No. 125,690

9 claims. (o1. 17e- 5.6) v y n l This' invention relates to the television art, and ent invention to obviate vundesirable prior art more particularly to transmitting and receiving practices. n i l apparatus connected therewith. Theaccompanying drawings are executed par- It Vis` an object of the invention to provide a tially diagrammatic to omit details non-essential v method and means for transmitting or broadcastto adiferentiation of the present invention from V ing from a single antenna or through a single prior practices and several of the conventional wire or through any suitable single channel of devices and actuating electrical circuits known communication, pictures of animated scenes or to the 'art are notdepicted.

objects or the like together with preselected Referring now to the drawings for a` more sounds, music or speech intimately related .to particular description and first to Figures 1 and 1Q said scenes in properly associated synchroniza- 2,.,-tvvo like electronic scanner tubes or envelopes tion; to provide means for receiving sound and Il) and II are employed at the broadcasting or picture signals for reproducing the initial chartransmitting station and v,a somewhat similar acteristics of kthe source of the scenes and reenvelopey I2 at the receiving station, each of said lated sounds at a remotely disposed receiving yenvelopes being provided with conventional coils, p 5 station in a manner whereby the cost of trans-v devicesend circuits arranged to produce elecmitting or broadcasting and receiving or transtronic beams I3, I4 andI in the envelopes I0,

lating sounds and pictures is appreciably lessened I i and I2 TBSDCCVGIY and t0 DTOVde hOIZODtI andpsynchronisation of receptionimproved. z and vertical deflection of said beams which are Other and further objects and advantages of indicated insaid tubes 'DY dotted 111S`0f 2J- 20 the invention will be understood from the follow- TOW headS- v w1, I ing detailed description thereof reference being The `scanning beams `I3 and lIII of the transmithad t0 the accompanying drawings in which; ting Station during Operation are always in the Figure l is a diagrammatic view, partially in same positions with respectto `each other and 25 section and partly in perspective, of a -soundtraverse a like sized rectangular-area and also 2 5 vision transmitting apparatus embodying the scan a like area except for certain later described o Figure 5 is a diagrammatic illustration `of ergized from asource 0f veletrical 'energyy C0111- 35 operation. mon to both, said source being in relectrical comheretofore practiced in the art since speech mlllCSuISOH Wththevetcal defleC'On and SYD- or audible sound and picture or light frequencies ChlOIlZi'flg SBHQTBJOI' 1111i# I@ and a hOIZOIltal 'vary appreoiably, audible sound frequencies have deCGiOll and synchronizing generatOI unit I1, been broadcastr from one transmitting apparatus Said units and their y(JllleltOrl, being -Well knOWn, andthe picture-light vfrequencies from another are believed t9 need 1f10v DarIJiCU-lal deSCIPtOn separate apparatus, the two said-apparatuses beherein. f ing often imperiectly synchronized. Heretofore A microphone I8 iS lJIOVded for the reception v a receiving `station has been provided with two for transmission of audible sounds intimately revseparate receiving instrumentalities, one thereof lated to. the later described animated scenes or 45 for he reception of sound signals and the other' picture, Said IIICIOPhOne being ncommuncatiOn for the recep-tionofl light vor picture signals, said with an amplifier I9 for correspondingly effectscparate receivers requiring tuning to the proper ing the'glowvlamp 2l and the light intensities `channel and adjustmentto synchronize the re-` `emitted thereupon and thereby -responsively,

moed sounds for proper association with r'ewhereby the light Avariations of the intensities 50 l animated scenes, whereby the cost of the of said lamp areresponsive to the sound vibradual instruments oi theprior art is comparations received by the microphone I8 or a simtively excessive, synchronization not perfect and v ilar phonetic device. more parts-utilized whichare susceptible of fail- Ari/object or animated scene 22- is suitably illu- 455 ure of operation, and it is an object of the presminai'eol by any desired means and the light in- 55 present invention. I maskingdevices.. The beam I5f` of the tube I2 Figure 2 is a similar View of a television realso traverses an areal-which` is proportional i cciver apparatus-employed. with respect to the area covered by the beams Figure 3 aromates a modification of tnotrans- I3 and I4 but travels in ,a reverse `direction t0 '3o mitte-r or broadcasting apparatus shown in Figthe beams I3 and III.'y y ure l. The beamsl I3 and I4 are maintained synchro- Figure i dep-cts a modincation of the receiver nized with respect t0 each other fOr Scanning illustrated in Figure 2. movements, their like deection coils l'being enmunication with the control tensities from the object 22 together with the light intensities from the glow lamp 2| are focused by means of their respective optical devices or lenses 23 upon their respective mosaic sheets 24 and 25 within the envelopes I0 and II, respectively, whereby the respective beams I3 and I4 of said envelopes may scan said intensities for transmitting signals.

The sheets 24 `and 25 are affixed to their respective back plates 26 and 21, the latter being suspended by means, not shown, within their respective envelopes I Il and II.

The back plate 21 is provided With a wire 28 in communication with a rst stage of amplification unit 29 and the back plate 26 is provided with a wire 30 joined to the wire 28, said unit 29 being in communication with a second stage of ampliflcation and a control unit'3I through a Wire 32. A wire 33 leads from the unit 3l to the anodes of the tubes Il! and II through thewires 35 and 34 which are joined to the wire`33. Each anode is in electrical communication at times through similar wires 38 with the respective laments for the scanner beams I3 and I 4' and batteries or the like, not shown, may be employedfor heating said filaments.

The vertical deflectioncoils of each envelope are in communication with the unit I6 through like wires 31 and the horizontal deection coils of the envelopes are in communication with the unit I1 through like wires 31'. The output terminals of the units lli vand I1 arejoined by means of a wire 39 and the latter is iny electrical comand amplifier unit 3I through a wire 4U.

'Ihe unit 3|" is `inv electrical communication through a wire 4I with a telephone wire or a modulator unit 42 Aand may be placed in communication through a wire 43 with-an oscillator and power amplification unit 44, the latter being in communication with an antenna or other suitable selected channel of communication indicated at 45. A greater or lesser number of elements such as the units 29, 44 and 4I may be employed for yvarious purposes as may be desired.

The operation of sheets coated with photosensitive particles such as the sheets 24' and 25 are well known to the art, said sheets being clasped to back plates such as or similar to the metallic back-plates 26 and 21.

A lconventional, mosaic sheet and combined back plate have .a surface area of six Aunits of widthto five units of :height and in the practice of the present invention said width ratio `is changed as well as the position of the mosaic sheets 24 and 25 with respect to the swing or horizontal travel of their respective beams I 3 and I4 while at the same time the proportional distance of travel and the area covered or traversed by the electronic beams I3 and I4 is maintained the same as heretofore. In other words, the electronic beams I3 and I4 cover or traverse an area which is six units of width in proportion to ve units of height and during said traversing scan the light intensities cast upon the sheets 24 and 25 as later explained.

The beams I3 and I4 start simultaneously and exactly from the same point or adjacent the lower corners 46 of the plates and swing horizontally to the opposite corners 41 of said plates; whereupon while returning in a direction towards the corners 46 said beams become raised up one line and scan one line while traveling again ina direction toward the corner 41 in a Well known manner, the operation being repeated until the corners 48 of the plates are reached; whereupon the beams become lowered to their initial starting point or the corners 46 and said travel repeated.

`During the horizontal travel of the beams in the direction from the corner 46 to the corner 41 and for all lines above the first and while traveling in the said direction, the lines of the subject matter or lightintensities focused on the mosaic sheets are scanned, the beams impinging against said sheets and when so impinged signals are generated. The arrangement and size of the sheets with respect to each other and the location of each with respect to the axis of the beams is such that when signals are generated with respect to the object 22 source, that no signals are generated with respect to the microphone I8 source and when signals from the latter are occasioned no signals from the object 22 source are broadcast or transmitted nor conveyed to the 'channelof communication which is common to said signal sources.

As represented by dotted lines in Figure 1, the optical devices 23 focus the lights and shadows or light intensities from their respective subjects exactly on their respective sheets 24 and 25, said sheets ybeing disposed at opposite sides with respect to each other and with respect to the axis of their scanning beams, said beams covering the saine portion of their respective fields at the same time and swinging in unison with like timed movements, whereby synchronization is perfect for alternately causing a signal to be broadcast from the subject 22 source and from the subject 2I source.

-In practice the sheets 24 and 25 are of the same height but of different width, the proportional area of said sheets being later explained herein, said area of said sheets are also proportional to the area of a fluorescent screen of a radio visor receiver later described, said areas of the sheets 24 and 25 with respect to the area of said iiuorescentscreen being cooperatively proportionally arranged.

The center of the side surface area of the plates 26 and 21 are in. exact axial alignment with the filaments for the beams I3 and I4I respectively. The mosaic sheet 25 is disposed to one side of the axis of its beam I4 and the major portion of the sheet 24 is disposed at an opposite side of the axis of its beam I3 and also. at an opposite side with respect to the sheet 25 as shown. The vertical edge of the sheet 24 which is closest to the corner 46 `of thevplate 26 is in horizontal alignment with the edge of the plate 26 which extends vertically from said corner 46 thereof, said edges of the sheet and plate being in vertical parallelism. s

The vertical edge of the mosaic sheet 25 which is closest to the corner 41 of the plate 21 is in horizontal alignment with said edge and in vertical parallelism therewith, whereby as the beams I3 and I4 travel horizontally in a direction from the corners 46 to the corners 41 of their plates,

' the electronic beam I3 impinging against its moposed side edge of the sheet 24 which is furthest from the said corner 46, the beam I 3 then not impinging upon any photo-sensitive particles while traveling further towards the corner 41 of the plate 26, signals from the picture source 22 stop 75 since the beam I3 then contacts with 'a blank or a masked area.

As soon as signals from the source 22 stop and resultant from the beam I4 having traversed its blank or maskedy area at said time, and having at said time, impinged upon the sheet 25 or photosensitive particles of the first line thereof, signals are thereby occasioned from the sound source or microphone I8 and more particularly from the light intensities of the neon-'glow lamp ZI source, which for the herein purposes may be called sound-signals and which are transmitted or broadcast in alternation with' the picture-signals from the object 22 source, whereby said signals from the two said originally different sources are broadcast through a single channel of communication which is common to both, said alternation of said signals being best understood from the diagram, Figure 5, and the example later stated herein in connection with said figure'.

In Figure l the plates 26 and 2`I are depicted with a conventional proportional side surface area of siX units of width to five of heighth in order to facilitate the herein explanation of the mask-ed areas and it will be understood that in actual practice the plates 26 and 2l need not be of greater side surface area than their respectively afxed mosaic sheets 24 and 25;

The wires 34 and 35 together with the wires 2li and 30 of the envelopes or tubes II) and 'II may be joined to any equal number of Vstages of amplication. l

It will be understood that conventional sizes oi plates and sheets may be employed, if provided with suitable masks, and that said masking may be consummated in a number of various ways as to said conventional size sheets or that said maskportion of each of the optical devices 23 impervious to the penetration or passage of light rays as later mentioned herein.

The remotely disposed receiving station or receiver shown in Figure 2 may include an antenna 49 for pick-up of said broadcast or transmitted signals, said antenna maybe included in the single channel of communication or wire 50 for the reception of said signals by the receiver unit 5I. The unit 5Iv is in electrical communication through a wire 52 with a volume and back ground control unit 53 having an output wire 54 which leads to the filament wire 55 within the envelope or tube l2 whereby an electronic beam or stream of electrons represented by the dotted f'. line of arrow heads 'l5 maybe occasioned in a well known manner for use inconnection with a fluorescent screen. The wire 52 is provided with tap wires 56 and 5l which are in communication, respectively, with the vertical l deflection unit 53 and horizontal deflection unit 59 for the beam I5. yThe units 58 and 53 are respectively provided with wires E39 and 6I in communication with corresponding deflecting plates for the beam I5, said members 5B to 6I inclusive being conventional are believed to require no particular description.

The fiuorescent screen 62 within the envelope I2 is such that televised pictures comprising reproductions or likenesses yof the scene or object 22 may be visualized on the back side of that porv tion of the screen which lies between thek dotted lines B3 and 64 and through the glass envelope or a window thereof.

The portion of the screen 62 which is responsive to the electronic beams I5 and I3 for produclng may be consummated by making a suitable y ing pictures is that portion thereof between the dotted lines 63 and 64 and the portion which is responsive to the beams I5 and I4 for soundsignals is that portion of said screen which lies between the dotted lines'64 and 65. The beam 'I5 starts to movev fromthe corner 66 of the screen 62 simultaneously with the start of the movement of the beams I3 and I4 from the corners 45 of their respective areas or plates and the beam I5 preferably swings in an opposite direction to the beams I3 and I4 and traverses the area of the fluorescent screen in a reverse direction with respect to the travel of the beams I3 and I4 for producing pictures which are right-side-up which would otherwise beupside-down and in the latter case could be reversed by extraneous lens means. The area of that portion of the screen between the dotted lines 63 and 64 is of a proportional area or size with respect to the area of the sheet 2li within the tube I3 and in an opposite relative position with respect thereto and at an opposite side of the axis of the beam I5 with respect to the axis of the beam I3 for the sheet 24.

The beam I5 starting from the corner 66 and moving towards the corner 61 of the fluorescent screen BZ first traverses a line between the dotted lines G3 and 64 responsive to the beam I3 in the tube I@ scanning a corresponding line of the sheet 2li and when the beamIE reaches an alignment with the dotted line 64Ik of the fluorescent screen 62 the beam I5 no longer is responsive to signals occasioned by the beam I3, the latter having at said time reached a masked portion of its line of travel and'at said instant the beam I5 continuing its rtravel towards the'corner 6l of the screen 62 is then responsive to the beam I 4 of the tubey II which at said instant has started to scan the first line of the sheet 25. The operation being repeated said beam I5 being responsive to the signal series alternately broadcast or transmitted.

The light intensities from the back side of the screen 62 which are generated responsive to the sound-signals of the microphone I8 source are made audible at the receiving station, the preferred means therefor including an` optical device or lens 3B so arranged with respect to that larea of the screen 62 which is between the dotted lines 64 and 35, that said lens focuses said light intensities onto the photo-sensitive cell or electric eye 69 for effecting the latter responsively and accordingly, said eye being in communication with an amplifier unit 1!) having an output in communication with the sound reproducer 'Il which is actuated correspondingly, saidphonetic device consisting of a dynamic speaker, ear

`phones or the like.

sheets 24 and 25 slightly smaller proportionally v than the total area of the fluorescent screen 82,

whereby the latter is provided with a blank or non-responsive portion in alignment with the dotted line 64 and which is represented in Figure 2 by a black line and which is that portion of the screen 52 where the alternation of the signal characteristics occur whereby when the beam I5 traverses said blank no light intensities are generated on the back side of the screen 62 and said possible jumbling is thereby prevented. If so proportioned a black line will actually appear at one side of the reproduced picture, however, said line is so minute as to be negligible in eiect but useful for correcting shifting of the reproduced picture in a Well known manner.

In actual practice the ratio of the area of the mosaic sheet 24 with respect to the sheet 25 is preferably substantially or about 5.99 units of width for the picture-signal sheet 24 to 0.01 unit of width for the sound-signal sheet 25, depending on the heighth of audio frequencies desired to insure clear sound reproduction, Said sheets 24 and 25 being of the same heighth.

The width of the fluorescent screen 62 is of a proportional area with respect to said sheets 24 and 25 and that portion thereof which lies be'- tween the dotted lines 64 and 65 is substantially 0.01 unit of width and that portion thereof which lies between the dotted lines 63 and 64 is 5.99 units of width, the height of the said screen portions being 5 units of height to a total Width of 6 units for both portions of said screen. The total area of all portions of the screen 62 may be many times greater than the combined areas of the sheets 24 and 25 provided said proportions are maintained. i

It being desirable to send signals alternately from the two different sources, the heretofore specifically described form and arrangement of the sheets 24 and 25 may be varied from.

If desired, two mosaic sheets of the same size may be employed instead of the sheet 25, said modified sheets being comparatively narrow and oppositely disposed with a comparatively wide space between them, their outer vertical edges being respectively in horizontal alignment withr the vertical edges of the plate 21 which extend from the corners 46 and 4'I of said plate, whereby a masked area is provided between such modified sheets. In this arrangement the exact median or center of the sheet 24 within the envelope I0 is disposed in exact axial alignment with the electronic gun or filament for the beam I3, said sheet having an area which is of substantially the same size as the masked portion between the two above mentioned modiiied sheets for the tube I whereby said medially disposed sheet is provided with a masked area disposed on each of its vertical side edges and between said edges and the vertical edges of the plate 26 which would extend respectively from the corners 46 and 41 of the plate 25 in such modiiication and in this arrangement the fluorescent screen 62 of the receiver is arranged accordingly whereby the picture-light intensities will be occasioned adjacent the medial portion of theI screen 62 and the sound-light effects adjacent both vertical edges of the screen 62, whereby the incoming alternately transmitted signals occasion sounds related to pictures in alternation as heretofore described, it being also necessary that in such modified arrangement that two lenses 68 be employed. By the' employment of either of the foregoing described arrangements of masks for the electronic scanners, sound signals may be generated in alternation with picture signals and reproduced at a receiving station.

A further modification of masking arrangement may consist of providing both lens devices 23 with an opaque portion whereby light intensities from the lamp 2| and the scene or object 22 are correspondingly emitted upon and provide amasked area for conventional sizes of mosaic sheets within the tubes l and Imaginary scanned lines or lines of the su jects are represented by the lines disposed across the object 22, the sheets 24 and25 together with the screen 62.

A still further modification of the foregoing described electronic scanners may consist of the employment of but one envelope at the sending station. In this modification the sheets 24 and 25 are assembled side by side in one envelope. The light intensities from the object 22 being focused onto the sheet 24 as heretofore described and the light intensities from the glow lamp 2| focused onto the sheet 25. In this modication an opaque divisional Wall between said sheets is necessary, said wall extending toward the lament of the envelope a distance sufficient to prevent the light intensities from the glow lamp 2| impinging on the sheet 24 and obstructing the picture-light intensities from the object 22 source and also to prevent the latter intensities from spreading over any portion of the sheet 25. In this modication the back plates of the sheets 24 and 25 are each provided with a wire, such as the wires 28 and 30 leading to the amplier 29 as heretofore describedA and but one electronic beam such as the beam I3 is employed, said beam impinging on said sheets alternately for effecting sound-signals in alternation with respect to picture-signals, the rmethod remaining the same and the above mentioned divisional wall being comparatively very thin having no electrical connection with said sheets.

Referring now to methods and means which employ other than electronic scanner and particularlyto Figures 3 and 4, two like scanner discs |00 and |0I may be employed at the broadcasting or transmitting station and a like scanner disc |02 at the receiving station, each of said discs being provided with a like series of pin hole apertures |03 arranged to provide a convolute lconfiguration in plan. Each of said series also includes anaperture |04 which are closest to the perimeters of said discs. Each disc and the apertures thereof are in the same relative position during use.

The discs |00 and IOI are maintained synchronized with respect to each other for revoluble movements, their respective axles |05 being provided with like worm wheels |06, each of which are in mesh with like worm threads |01 mounted on their common shaft |08, the latter being driven by a motor |09 for serving both discs. The motor is in communication with a suitable source of electrical energy through the wires H0, whereby said discs are rotated in perfect sychronization by a driver common to both.

The number of the pin hole apertures are equivalent to the number of scanned lines and the discs are rotated at a speed equal to the number of pictures or portions of the object desired per `second of time. The conventional number of pictures per second is twenty and moving picture lms conventionally have twentyfour pictures per second. The aspect ratio of the eld of view of the object is conventionally six units of width to five of heighth and the scanner discs have the saine aspect ratio whereby theyr are adapted to scan the same area of their respective fields of vision alike except for later mentioned masks.

A microphone III is provided for receiving sound vibrations, the latter being preferably amplified by means of the unit ||2 for corres- 2,195,676 .pondingly ,eiecting the light intensities emitted by a glowlamp.||4, whereby said'sound vibrations cause variations in said intensity .responyArc lights' H5 mayy be' employed forjiiiunniint-y ing the animated scene or objectlllB and thelightintensities from the object and the light intensities fromthelamp H4 are focused by means of theirrespective'lenses v| upon their respective revolving scanner discs and more particularly through the apertures thereof for scanning said intensities which, as permitted by certainlater described masking devices, penetrate through said l apertures. Said intensities from the lamp I i4 and object I6 are gathered by their respective optical' devices or lenses.

|.|8 which focus the saidrespective light beams `upon their respective photo-electric cells ||9 `for `correspondingly effecting the latter for generating signals accordingly. The signals may be ampliiied in the unit |20 which is common to both of the cells ||9. l vThe member |20 is vprovided with an output wire or single `channel of communication |v2| .for j each of said signal Sources, the latter including the initial source ||6 and the .initial source and said channet may include the antenna |22, whereby two vcarrier waves of like amplitude are broadcaster transmitted, each vof said Waves being respectively modulated by one of the said different initial signal sources. By this means the audible frequencies are modulated to equivalent mea-nirequencieswitlr respect to the object M6 for providing the same radio carrier frequencyy for each rsource for transmission through or over said portioning the pictures of the light intensities of the glow lamp H4. y 1

, A masking` frame |23 is provided for the ydisc having a rectangular opening- |25 so arranged that the pin hole apertures of the disc can be rotated into alignment therewith successively, said frame having an opaque masking portion A masking frame |26 of the same size as the frame.|23 is provided for the disc |0l. .The frames are in the same relative positions in use. The frame |26 is provided with a rectangular opening |21 which is smaller in area than the said opening |24 said frame |26 also being provided with an opaque portion or mask |28 which is of greater area than the masking portion |25 of the frame |23, "said opaque portions or masks lessen the field of view of their respective scanner discs, being disposed between the latter and their respective lenses |18.

The mask |25 is disposed to one side of'an imaginary vertical line taken through the axle of the disc v|00 whereby only the light intensities from theobject ||6 which are focused to the left side of said mask through the aperture |24 are operative. The major portion of the mask `|23 is I disposed tov one side of an imaginary vertical line through the axle of the discv |0| and obstructs light intensities from the glow lamp ||4 whereby Dnly the.. light, ,intensitiesv kfocussed direcy through the aperture |21 are operative. The

masks are disposed at opposite sides with respect to each other.

The size or area of themask |25 isprefer-` .ably substantially the same sizeas the rectangular opening |21 of the frame |25 and the mask |28 is of a like areawith respectto the rectangular opening |24 vof the frame W3.' f

Imaginary scanned lines of kthesubjects are ,represented by the lines disposed across the rectangular apertures |24 and |21 and 'indicate the 'operative area of the eld of View of the scannergdiscs |00 and |0|. l The discs |00 and |0| are alikev andsynchronized ior uniform movements,A their `pin y hole apertures lil of their respective serieszoflapertures. '|03 being in the same relativepositions during operation, whereby said respective apertures |04' become horizontally aligned `with the like edges of their respectivemasking'frames at the same time and the disc y|00 .begins .to scan lits subjectrst since the aperture kHill of the disc |00 reaches an alignment with the rectangular aperture `|24 rst and `before the aperturev |04 of the disc |0| becomes in horizontal alignment with the rectangular aperture l2? resultant from the mask for-thedisc ||l| preventing the same at saidtime.v The photoelectric c ell for thedisc |0| is inoperative until lthe aperture |04 of the said disc becomes rotated into a horizontal alignment with the rectangr.-

lar opening |21 and past the mask |23, at which time the aperture HM of the disc |00 becomes in horizontal alignment with the mask wherebythe photo-electric cell which is in alignment `with kthe object H5 becomes inoperative, re-

sultant from the pin hole aperture |01! of the disc |00 becoming masked whereby no signalsy are occasioned from the object H6 source at said time from light passing through the said aperture |04 ofthe disc |00.

By means of said masks, iirst a scene signal or a short series o f the same is broadcast from the object H6; whereupon said signals cease resultant from the mask ,|25 causing the same and at said instant when said picture-signals cease, a speech or sound signal or a portion of the same or a short seriesy of sound-signals which are intimately associated with the object ills` is thentransmitted or broadcast from the microphone source, whereby the soene-signalsand the sound-light-signals are transmitted alternately and in a proper relative timing of the sound-signals with respect to the scene-signals, 4said alternation being continuousiy repeated for pickup by a remotely disposed radio vvisor or television receiver tuned to the lradio carrier frequency of said signals.

Referring to Figure 4, the disc |02 -of saidvisor has heretofore been partially described, said discbeing xed to an axle |29 having aworm wheel |30 and worm threads |3| which-are of like size andl type as those Aheretofore mentioned. The shaft v|32 is the ,construction ofmodulating the iight intensities of the glow lamp las.

The received signals from the two said initially different signal sources, being trans- 'mitted at the same amplitude or mean light frequency as modulated by the variations of intensity at the sending station cause correspondpin hole apertures |03 of the disc |02 as the latter revolves. A frame |39 having a'rectangular opening |40 is employed to confine the light rays which penetrate through the apertures of the disc |02 to said aperture |40 whereby the lens or optical device 4| focuses said rays correctly and proportionately upon thesurface of a screen |42 which may be of conventional ground or frosted glass. The area of the flat plate in the lamp |38 determines the size of the field to be scanned by the disc |02-and the'latter is so spaced from said plate that all ofthe available glow surface of the plate is utilized for maintaining the proper width to heighth ratio of ve units of heighth to six units of width for the screen |42.

The glass screen |42 has a portion |43 which collects light intensities of the lamp |38 v responsivelywith respect to sound-signals originating initially at the microphone having a Vjuxtaposed or aligned portion |44 which collects light intensities from the lamp Y|38 responsively with respect to the signals which originate initially from the picture or object |56.

The pictures from the source ||6 are visualized at the receiving station upon the back side of the portion |44 of said glass screen. i

The light intensities from the back side of the screen-portion |43 are focused by means of the lens or optical device |45 onto a photo-electric cell |46 in communication with Yan amplier unit |41 and a phonetic device |48 which may be a loud speaker, ear phones or the like, whereby the sound signals originating from the `microphone are reproduced by said phonetic device at the receiving station.

The intensities from the glow lamp |38 are scanned by the disc |02, said scanned lines being represented by the lines disposed across the opening |40 of the frame |39 and further represented by the lines across the screen |42 and it Will be understood that to transmit picture-light and sound-light signals of the same amplitude or mean frequency as heretofore described that a higher number of lines per second must be transmitted than the highestaudible sound vibration frequency.

'Ihe operation of the instrumentalities shown in Figures 3 and 4 may be readily understood from the diagrammatic illustration Figure 5 wherein A represents the mask |28 for the scanner disc`|0| and B the rectangular aperture |21 of the frame |26; C represents the mask for the disc |00 and D the area of the rectangular aperture |24 of the frame |23. It will be noted that at times when light intensities pass through B that similar intensities are prohibited frompassing through C and similarly when such intensities pass through D intensities are prohibited from passing through A, whereby light intensities are alternately communicated to the screen E, the portion F thereof receiving the soundsignal intensities for a reproduction of the original sound in alternation with respect to-the reception of the portion G of thepicture-lightlsignal intensities from the object ||6 source for a reproductionof said pictures. l

In actual practice it is advisable to s o proportion the masks |25 and |28 that lthecombined areas of B and A and the combined' areas of C and D are slightly less than the total area of the screen Eto prevent the heretofore mentioned jumbling `of signals wherebyva blank or nonoperating space is provided on the screen represented by a black vertical line thereon in Figure 4 and in the diagram Figure 5.

Obviously the herein Yspecifically described form and arrangement of masks may be substituted for masks. provided on or painted on the lenses It will be understood that certain features'and sub-combinations are of utility and may be employed without reference to other features and sub-combinations. This is contemplated by and is within the scope of my claims. It is further 'obvious that various changes may be made in details within the scope of my claims without departing from the spirit of my invention. It is therefore to b e understood that my invention is not to be limited to the specific details shown and described.

I claim:

l. In an electronic television system, a microphone for reception of sounds, a glow lamp, means for causing the lamp to emit light of varying intensityresponsive kto sound vibrations-received by the microphone for producing soundiight intensities, means for developingl picturelight intensities, a pair of synchronized electronic canners adapted to scan their respective fields simultaneously alike, means for focusing said picture-intensities onto one of said scanners eld and sound-light-intensities onto the other scanners eld, means for causing a portion of each of said fields to be inoperative to produce complemental elds completing the plan of a larger field, energizing means for causing each scanner to scan the operative portion of its eld for developing a series of'picture-signals responsive to the picture-light intensities and a series of `sound-signalsl responsive to thesOund-lightintensities in alternation with said series of picture-signals, a single output channel of signal transmission, means for transmitting said dual series in alternating wave periods through said channel, reproducing apparatus and framing apparatus forming part of said receiving station for effecting 'respectively reproducing and framing actions thereat, means including a fluorescent screen corresponding in area to the said larger eld and forming a part of the receiving station for rectifying one of the received synchronizing Waves to develop pictures on part of its area during the picture-wave period and sound-light intensities on the other part of its area during the sound wave period, and means including a focusing-device, a photo-sensitive cell and a sound reproducing device and forming a part of said receiving station for modulating said soundlight intensities to develop audible sounds during the sound-wave period.

2. In an electronic television signalreceiver, a device responsive to phase angle betweeny two voltages comprising incombination withmeans delivering two' alternating-current voltagesv having frequencies of substantially the same order of magnitude, an exhausted envelope, means therein for producing a stream of electrical particles, means for varying the intensity .of .said

stream in response to one of said voltages and to a received signal, and means for deecting said stream to either side from a mean path in response to the other of said voltages, two fluorescent screens having different surface areas intercepting said stream of electrical particles on either side of the axis of said mean path, and means including a lens, a photo-sensitive cell and a sound reproducer responsive to said interception by the screen of lesser area and to said signal for translating light intensities emitted from said lesser area screen into audible sound.

3. In a television transmitter a mosaic, means for throwing a scene directly upon said mosaic, means for scanning said mosaic and for converting light intensities into electrical frequencies, a second mosaic complemental in shape to the first named mosaic, said two mosaics shaped to complete the plan of a larger mosaic, means for converting sound into light intensities, means for throwing said light intensities directly upon said second mosaic, meansfor scanning said second mosaic and for converting light intensities into electrical frequencies, synchronizing means for said two scanning means whereby said two scanning means scan the complemental mosaics alternately lineby line, and means for transmitting the two sets of electrical frequencies through a single output channel.

il. In a television transmitter, an electronic scanner for a scene, a screen for limiting the field of said scanner, means for converting light passing through said scanner into electrical frequencies, means for converting sounds into light intensities, a second electronic scanner similar to thek rst said scanner for said light intensities, a screen complemental to the first named screen for limiting the eld of the second scanner, said two limited elds completing the plan of alarger field, means for converting light passing through said second scanner into electrical frequencies, means for synchronizing said scanners to scan the two complemental fields alternately, and means for transmitting the two series of electrical frequencies through the same output channel.

5. In an electronic television receiver for the reception of signals alternately corresponding to Y picture and sound intensities, means for converting said signals into light intensities, a screen divided into picture reproduction and sound-light receiving sections, an electronic scanner for directing the light intensities onto said screen synchronized with said signals to direct the alternate picture and sound light intensities to the respective sections of the screen, said picturelight intensities producing on the screen an image of the picture, and meansv for reconverting the sound-light intensities on the screen to sound.

6. In a television4 transmitter, means for picking up sound impulses, means for transforming said sound impulses into light intensities, separate and similar synchronized electronic means for directly scanning picture-light kand related sound-light and transforming them into electrical frequencies, said scanning means operating to scan similar areas simultaneously and includingfrequencies, means for converting sounds into y light intensities, an electronic second scanner similar to the rst said scanner for said light intensities, a screen complemental to the first named screen for limiting the field of the second scanner, said two limited eldscompleting the plan of a larger field, means for converting light passing through said Second scanner into electrical frequencies, means for synchronizing said scanners to scan the two complemental fields alternately, means for transmitting the two series of electrical frequencies through the same output channel, and a receiver for said transmitted series including means forconverting the frequencies into light of corresponding intensities, a scanner synchronized with the first said two scanners, a screen to receive the light from the last said scanner and corresponding in area to the plan of said larger field, said screen receiving light corresponding to the scene on a portion of its field and the light corresponding to the sound on the other part of its field according to thev plan by which said fields were limited, and means for reconverting the light corresponding to sound on said screen to sound.

8. In an electronic television system a receiver for signals alternately corresponding to picturelight and related sound-light, comprising means including a scanner for translating said signals into light and for locating said light upon a field in distinct areas of picture-light and sound-light, the scanner being synchronized and the field being proportioned according to the occurrence of the two types of signals, the pictures being displayed upon the picture-light area of the field, and means for translating the sound-light of the field into sounds related to the pictures.

9. In an electronic television receiver for the reception of signals alternately corresponding to picture and sound intensities, means for converting said signals into light intensities, a screen divided into picture reproduction and sound-light receiving sections, said sound-light receiving section being relatively small with respect to the picture reproduction section, a scanner for directing the light intensities onto said screen synchronized with said signals to direct the alternate picture and sound light intensities to the respective sections of the screen, said picture-light intensities producing on the screen an image of the picture, and means for reconverting the soundlight intensities on the screen to sound.

JAMES MCCARTY.

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