US1873785A - Tube commutator - Google Patents

Tube commutator Download PDF

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US1873785A
US1873785A US269099A US26909928A US1873785A US 1873785 A US1873785 A US 1873785A US 269099 A US269099 A US 269099A US 26909928 A US26909928 A US 26909928A US 1873785 A US1873785 A US 1873785A
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channels
tube
signal
channel
tubes
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Ranger Richard Howland
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RCA Corp
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RCA Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/385—Exhausting vessels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/042—Distributors with electron or gas discharge tubes

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  • the present invention relates to signalling systems and particularly to signalling systems wherein a plurality of signals are to be transmitted, and to a method and means for multiplexing the various signals for' transmission.
  • a principal object of my invention is to provide a tube commutator system whereby it is possible to utilize only vacuum tubes for commutation in a system for either picture of facsimile transmission, multiplexing or for television on a multiplewave communication system.
  • a further object of my invention is to produce a commutator system wherein it is possible to transmit pictures or facsimile or to utilize the system for television or a plurality of speech communications on a plurality of separate electro-magnetic Waves, in which the commutation, or switching from one signal channel to another, is accomplished by means of delayed action vacuum tubes without the use or aid of any mechani terrupted manner than is possible with mechanical commutation, since with the latter it has always been necessary to stop the transmitting arrangement at frequent intervals for the purpose of changing the brushes on mechanical commutators.
  • a still further object of my invention is to provide a tube commutating system .for utilizing a plurality vof bands of difierent frequencies for wire or radio communication, in which the tube commutating system is absolutely and totally independent of the use of any relays for accomplishing the channeling or switching from one frequency to another.
  • object of my invention is 1928. Serial No. 269,099.
  • a still further object of my invention is to provide a tube commutator, or rotary oscillator, in which the time period of signalling through each channel isregulated, so that if only one channel has a signal at the par- I ticular instant'it may utilize practically the entire time available for all channels irrespectlve of the other channels in the commu tating system, in contrast to schemes heretofore known, where the time was divided equally between all of aLseries of separate communication channels.
  • Still a further object of the invention' is to provide an arrangement whereby it is possible to utilize a plurality of frequencies in the transmission 'of pictures, facsimiles, speech or code, or a television system'and to provide at the same time a system which readily adapts itself to the combining of the separate messages into a joint or. finished message ata' receiving point.
  • Still a further ob ect of my invention is to tion wherein it is extremely easy at anytime to increase the vnumber ofcommunication channels without the necessity of changing or altering thearrangement as initially set the up, but by merely making additions to original set-up.
  • a still further object of my'invention is to provide an arrangement wherein great ease of maintenance is experienced.
  • the invention also has for its objects those of providing a tube commutating device which is simple in its construction and arrangement of parts, a system which is durable, compact, very efiicient in the use of the time for signaling available, a system which is conveniently operated, readily set up, and a system which may be installed at a minimum of expense, as well'as a system which is highly capable of meeting the conditions of the future by its feature of readily adapting itself to the enlargement of the number of signaling channels used.
  • Fig. 1 represents one adaptation of my tube commutating system to a system using four separate channels of communication and in which the signals of the separate channels are introduced in the system through multiple grid connecting or modu lating tubes. Although, as shown, the system is applied to four signal channels, it will be readily seen how the number could be increased to any number desired; and,
  • Fig. 2 is a modification of Fig. 1, in which only the usual three electrode tubes are used.
  • Fig. 1 of the drawings it is believed best to consider first the several channelsv for introducing the separate signals into the commutator which are indicated broadly as A, which is composed of the tubes 1, 2, 3 and 4; B, which is composed of the tubes 6,7, 8 and 9; C, which is composed of tubes 11, 12, 13 and id; and lastly, as shown by the drawing, D, which includes the tubes 16, 17, 18 and 19.
  • A which is composed of the tubes 1, 2, 3 and 4
  • B which is composed of the tubes 6,7, 8 and 9
  • C which is composed of tubes 11, 12, 13 and id
  • D which includes the tubes 16, 17, 18 and 19.
  • Each of the separate channels A. B, C and D feed their outputs into separate amplifiers 5, 10, 15 and 20 respectively.
  • the plate 77 of tube 1 is supplied with plate voltage from a source of high potential 33, the plate 7 8 of tube 2 is energized from a source 36a, the plate 7 9 of tube 3 is energized from a source 36, and, lastly, the plate of tube 4: is energized from a source of high potential 34.
  • the tube 1 tends to pass current and the condenser 21 which is connected across the filament and plate'lead to this tube has stored up energy so that at the time the tube tends to pass plate current the condenser 21 will tend to discharge due to the sudden rush of current through the tube 1.
  • This negative potential applied to the grids 62, 67 and T 2 of the first tubes 6, 11 and 16 of channels B, C and D, respectively, causes a similar negative potential to be applied to the grids of all the tubes in these respective channels because the grids of the various tubes in each channel are connected.
  • This negative potential cuts oil" the flow of plate current in all the tubes so that the output of each separate channel excepting A is cut oli.
  • the tube 4 receives its plate current through a source of potential 34 which also connects to the grid resistor 30 of the tube 6 and, as the filaments of all tubes are in parallel, is efiectively connected with the filament of tube 4.
  • a source of potential 34 which also connects to the grid resistor 30 of the tube 6 and, as the filaments of all tubes are in parallel, is efiectively connected with the filament of tube 4.
  • the grid 63 of the tube 7 which is directly associated with grid member 62 will also become positive with respect to the previous potential and the tube 7 will tend to pass plate current through the plate member 82, the source of plate potential 35, grid resistor 29 of tube 1 and the filament of tube 1.
  • the grid 57 of the tube 1 will tend to become negative by virtue of the fact that the end of the grid resistor 29 of the tube 1 has changed from a positive-to a negative value due to the fact that plate current is being drawn through the-tube 7 from the battery 35. This will tendto make the'grids 57, 58, 59 and 60 of tubes 1, 2, 3 and 4 respectivelv all more strongly negative and will, therefore, i
  • each of the tubes in channel B will commence to pass plate current.
  • the tube 7 drawsits plate current from source 35
  • the tube 8 draws its plate current from the source36a
  • the tube 9 draws its plate current from the source 36 and, as before stated, the tube 6 draws its plate current from the source of B or plate potential 33.
  • B of discharging of condenser 22 which Due toan action'in channel is similar to the discharging of condenser 21 in channel A and the voltage drop in the" resistance 26, connected in series with the plate 81 of the tube 6 and the B source 33, the
  • channel C tends to pass plate current by virtue of the fact that the grid' member 68 hasbecome positive through its connection to grid 67, the grid 62 of tube 6 of channel B has become negative due to.
  • the grids 73, 74 and 75 of the tubes 17, 13 and 19 of channel D have likewise all swung positive, and under this condition the tube 17 is drawing plate current from the source 36 and the grid 67 of tube 11 in channel C is, therefore, placed at a negative value because the point of connection of the grid resistor 31 to the grid 67 of tube 11 has become negative.
  • tube 18 at once commences to draw plate current from the source 34 and holds the grid 62 of tube 6 at a negative value for the same reason and tube 19 drawing plate currentstill holds the grid of the tube 1 at a negative value by reason of the fact that plate current is being drawn from the source 35.
  • the tubes 2, 3 and 4 pass plate current and it may, therefore, be similarly s iown by reference to the description above that the tube 2 will control the grid '4' 2 of tube 16 to maintain it at a negative value, because tubes 2, 8 and 1 each draw plate current from source 36a connected to the grid resistor 32 of tube 16. Similarly the tube 3 will control the grid 67 of tube 11 to maintain it at a negative value since tubes 3, 9 and 1'?
  • thissystein functions alternately and successively to switch from one channel to another and that the rate of switching will be totally dependent upon the rate of discharge of the respective condensers 21', 22, 23 and 24L associated with the tubes 1, 6,11 and 16 of channels A, B, C, and 1) respectively.
  • each of these secondary grids are connected to a signaling circuit, of any desired or appropriate type, through transformers 98, 99, 100 and 101, or, if desired, through any other suitable coupling such as resistance, impedance, capacity coupling and the like. If it is assumed that the arrangement is being used for facsimile reproduction, it is a well known fact that the greater part ofany facsimile is composed of what is known as the whiteportion in contrast to the black portion, as in the case of a positive print.
  • channel A is the only one-that has a signal, or in other words the only channel over which a black portion of the facsimile is being transmitted, that the grid 53 of tube 1 in channel A is less positive and nearer a zero potential than the grids 54, 55 and 56 of tubes 6, 11 and 16 of channels B, C and D respectively.
  • each of the tube channels A, B,C and D are the tubes 5, 10; 15 and 20, respectively, which have their grid members 61, 66, 71 and 76, respectively, connected to thesame input as the grids 60, 65, 7 02nd 7 5 of tubes4, 9, 14 and 19 except that the grid connection of the tubes 5, 10, 15 and 20 is made ahead of the resistancemembers 37', 40, 43 and 46 so that the group of the tubes 5, 10, 15 and 20 will not reach a negative value until some time after the tubes 4, 9, 14, and 19 become negative by reason of the fact that the resistances 37,40, 43 and 46 must be first overcome. l/Vhen thegrids of,
  • each oscillator is fed into an antenna 106 throughtransformers or-other forms of couplings generally designated. as
  • the antenna 106 is grounded in any desired manner as'at 107.
  • eachchannel is functioning one channel or the other is feeding. its output into the antenna member'106 and it is further desirable and a purpose of the invention to have each of the oscillators 49, 50, 51 and 52 feed diiierent tones or frequencies, as, for example, 1,000, 1,300,.
  • the battery 97 is shown as a source of potential forrall the oscillators 49, 50, 51 and 52. If desired, neon lamps or other glow indica tors 108, 109, 110 and 111 may be associated with the output of amplifiers 5, 10, 15 and 20 and the oscillators 49, 50, 51 and 52 for the purpose of indicating the time rate of change of-the signal carried from one channel to another as well as to determine whether or not the system is in operation.
  • Fig. 2 of the drawings a similar arrangement to that of Fig. 1 is shown, with the exception that 1nstead of using the double grid tubes, 1, 6, 11 and 16, these are replaced by the three electrode tubes 1a, 1b, 10 and 1d, Working in conjunction with the three electrode tubes, 112, 113, 11 1, 115 each of which last named tubes receive the signals from channels, A, B, O and D, respectively.
  • the tubes 112, 113, 114, 115 have their plate electrodes connected with the sources of potential 116, 117, 118 and 119, respectively, in the usual manner.
  • neon lamps 120, 121, 122 and 123 are connected with the output circuits of the tubes 1a, 1b, 1c and 1d as well as tubes 112, 113, 114 and 115 for a purpose to be hereinafter described.
  • This negative potential applied to the grid of the first tube in each of channels B, C and D cuts off the plate current in all the tubes in the channels so the output of each channel but that of channel A is cut off.
  • the positive grid (actually of zero potential but relatively positive) of the first tube 1a permits the condenser 21 to charge.
  • the potential of the condenser acts in conjunction with the B battery voltage 33a, which is below the extinction voltage of the neon lamp 120.
  • the additional voltage across the neon lamp 120 is of such a value as to flash the lamp.
  • the purpose of the neon lamp is to cause the condenser potential to vary between two limits and the time element depends upon how long this differential potential builds up with respect to time.
  • the mechanism or construction of the neon lamp is such that a definite voltageV is necessaryto start the lamps flashing. Once the lamp flashes, it will continue to remain lit while the potential across it is lowered until a critical voltage V is reached, under which condition the lamp goes out. V is called the starting voltage and V the extinction voltage. To start the lamp flashing again, the potential must be equal to V and the lamp will not go out until V is reached.
  • t is the time
  • C is the capacity of the condenser
  • V is the starting valtage of the neon lamp
  • V is the extinction voltage
  • i is the charging current. Consequently, from a knowledge of the values of O, V and V the time that any particular channel is on or operating for both the signal-on and the signal-01f conditions may be fixed a priori by adjusting the charging currents. Incidental to this function of the neon lampthe lamp may also indicate whether the system is functioning if an observer watches whether or not the flashing operation is occurring. l/Vhen the condenser is discharged a negative potential is applied to the grid of the tube 4 of channel A by virtue of the voltage drop in the resistor 25 connected to the B battery for reasons similar to those previously stated.
  • channel B now begins to charge, and when it is charged suiticiently to flash the neon lamp 121, channel 0 is placed in an operative position which stops the operation of channel D and likewise prevents the operation of channels A and B in a manner which has been previously disclosed. The action of the tube is then passed on to channel D, and from D to A, and so forth, to complete the cycle of operation over and over again.
  • the charging current of the condenser can be varied, and since it is the charging time of each condenser that controls the length of time any separate channel is operating it is evident that if no signal is on the grid of the signal tube this grid is at zero potential, and the charging current of the condenser is the sum of the plate currents of the signal'tube 112 and first tube 1a of the channel, if channel A is considered.
  • the polarity of the incoming signal voltage applied to the grid of the signal tube in each channel is such as to make the grid go negative when the signal comes on.
  • the grid of this signal tube is carried to a negative value so as to cut down substantially and partially cut-ofi the plate current of the signal tube 112, which reduces the charging current in thecondenser and thus increases the time necessary to charge the condenser.
  • the output of the channel is operative for a longer time than when there is no signal,which is readily seen in view of the fact that the charging rate of the associated condenser is slower.
  • I claim 1 1. lhe method of obtaining multiplex com munication with a plurality of signal channels which includes impressing signals upon each of a plurality of signal channels, cyclically varying the time of operation of each of said channels in accordance with the strength of said impressed signal impulses, and transmitting energy from said plurality of signal channels in accordance with said varying time rate of operation.
  • The-method of varying the time operation of a plurality of signal channels in a multiplex communication system which includes impressing aplurality of signals upon a series of signal channels, cyclically and successively switching from one to another of said signal channels, controlling the time operation of each of said plurality of signal channels in proportion to the intensity of the said impressed signals, and controlling a signal transmitter for all of said signals inaccordance with the time rate of operation of each of said signal channels.
  • the method of obtaining multiplex communication with a plurality of signal channels which includes impressing signals upon each of said plurality of signal channels, transmitting the signal energy from each of said channels, and controlling the time operation of transmission for each of said chan nels in accordance with the signal intensity impressed upon each of said channels.
  • a multiplex communication system a plurality of signal channels, vacuum tubes associated with each of said channels, and closed circuits so connecting the vacuum tubes in each of said channels as to cyclically and periodically'shift from one to another of said signal channels for time periods varying in accordance with the presence and absence of signals impressed upon each signal channel.
  • a communication system comprising in combination a plurality of signal channels, a plurality of vacuum tubes associated with each of said signal channels, one of said tubes in each of said signal channels functioning as a control tube for said channel, means provided by said control tube for delaying the time of action of the particular signal channel during periods when signals are received and accentuating the rate of operationof said signal channels during non-signalling periods, and an antenna system associated with all of said signal channels for transmitting energy output from said signal channels in accordance with the rate of operation of said channels.
  • a multiplex communication system a plurality of signal channels, means for applying signals to each of said channels, a plurality of tubes in each of saidchannels, said plurality of tubes including one controlling tube, means for cyclically changing the grid potential on said controlling tube, and means for altering the grid potential on the other tubes of said channel, means for delay ing the time of passage of a signal through each of said channels for one predetermined condition of grid potential and accentuating the time of travel of signal through said channel for another predetermined condition of grid potential, an antenna system, and means for coupling each of said signal chan nels with said antenna system and successively and continuously transmitting the energy from said channels through said antenna.
  • a multiplex communication system a: plurality of signal channels, means for applying signals to each of said channels, a plurality of tubes in each of said channels, said plurality of tubes lncludlng one controlling tube means for c CllOElll chan ing the grid potential on said controlling tube in accordance with varying strength signals applied thereto, and means for correspondingly altering the grid potential on the other tubes of said channel, means for delaying the time of passage of a signal through each of said channels for one predetermined condition of grid potential and accentuating the time of travel of signal through said channel for another predetermined condition of grid potential, a modulator tube associated with each of said signal channels, an antenna system, and means for associating said modulator with said antenna and influencing said antenna from each of said modulators in accordance with the time of operation of each of said modulators as controlled by the time of passage of signals through each of said signal channels.
  • a multiple communication system a plurality of signal channels, means for applying signals to each of said channels, a plurality of tubes in each of said channels, said plurality of tubes including one controllin tube, means for cyclically changing the grit potential on said controlling tube, and means controlled by said controlling tube for altering the grid potential on the other tubes of said channel, means for delaying the time of passage of a signal through each of said channels for one predetermined condition and accentuating the time or" travel of signal through said channel for another predetermined condition, an oscillator associated with each signal channel, means for modulating the frequency generated by said oscillator by said modulating system, an antenna means for radiating the energy output of each of said oscillators during successive periods of operation of each of said tube channels.
  • a multiplex communication system a plurality of signal channels, means for applying signals to each of said signal channels, a plurality of thermionic relays in each of said signal channels, means for maintaining the grid electrodes of all of said thermionic relays in each channel at a uniform potential, a circuit connecting successive tubes of said plurality of signal channels, means for switching from one to another or said signal channels in accordance with the potential bias on the grids of the tubes in one of said signal channels and an output circuit for utilizing the energy transferred through said signal channels during the said interrupted periods.
  • a communication system including a plurality of signal channels, means for applying signals to said signal channels, a plurality of thermionic relays associated with each of said signal channels, means for maintaining the controlling electrode of each of the relays of each separate channel at substantially uniform potential, one of said thermionic relays in each channel functioning as a controlling relay for the said channel,
  • a multiplex communication system including a plurality of signal channels, means for applying aplurality of signals to each of said signal channels, a'plurality of vacuum tubes associated with each of said signal channels, one of said vacuum tubes in each of said channels functioning as a controlling tube, means for maintaining the grid members of 7 all vacuum tubes in each channel at a uniform potential, means for cyclically changing the grid potential of the controlling tube in each channel, means associated with said controlling tube for altering the grid potential on successive tubes in each of said signal channels upon a change in grid potential in said controlling tube, an antenna system associated with each of said signal channels, for successively and continuously transmitting cyclically varied energy from each of said signal channels.
  • a signal energy regulating system a plurality of signal channels, a plurality of vacuum tubes in each of said signal channels, means for applying signals to each of said signal channels, circuits connecting each of said signal channels for ener izing onevor another of said channels at predetermined intensity and cyclically varied intervals,'mea'ns for cyclically and periodically changing from one to another of said signal channels at a rate of speed proportionate to the signal strength introduced on any channel, and an output circuit for utilizing energy from said signal channels transferred thereto at cycli cally and periodically interrupted intervals in accordance with the time of passage of a signal through said signal channels.
  • a communication system comprising in combination a plurality of signal channels, a plurality of vacuum tubes associated with each of said signal channels, the number of vacuum tubes in each signal channel being equal to the number of signal channels, a controlling tube for each of said channels, means for cyclically maintaining the grid members of the tubes in each of said separate signal channels at a uniform potential, means for cyclically changing the grid potential on the grid of said controlling tube of each signal channel and simultaneously altering the potential on all the grids of the tubes in a succeeding signal channel, means responsive to signalimpulses received on any of said signal chambers for delaying the time of changing the said grid potentials on the said con trolling tubes in each channel at periods when signals are received and accentuating the rate of change of potential during non-signalling periods of any of said channels, means by which each tube of the tube channel passing current will tend to block the remaining channels of the system, a modulator tube connected with each of said channels and arranged to pass current simultaneously to the time when its associated signal channel is actuated, an oscillator connected with the output circuit of
  • a plurality of signal channels a plurality of thermionic relays including a controlling relay associ ated with each of said signal channels, means for applying signals of different frequency to the thermionic relays of each of said signal channels, c1rcu1ts connecting the various relays in each of said signal channels, means for cyclically changing the grid potential on the controlling relay in each of said channels, and'means provided by said connecting circuits between the elements of said signal channels for switching from one to another of said channels at predetermined periods govf erned by signal intensity reaching said channels, an oscillator associated with each of said signal channels, and an output circuit for utilizing the energy from said oscillator at predetermined intervals oftime governed by the time of passage of signals through said signal channels.
  • a plurality of signal channels each including a plurality of vacuum tubes, means for introducing signals of different frequency upon each of said signal channels, circuits connecting the various elements of each of said channels and providing a connection between the various elements ofeach of said channels, means including a glow-discharge lamp for controlling the time of operation of each of said channels, and means for successively and continuously utilizing the energy from each of said signal channels.
  • a plurality of signal channels each including a plurality of vacuum tubes, circuits connecting each of said signal channels and associating the controlling element or" one yacuum tube t each signal channel with at least one tube of each other channel, glow lamp means for controlling the time of operation of each 5 of said signal channels in proportion to the signal intensity reachingsaidsignalchannels, and a load circuit for successively and continuously receiving energy from each of said signal systems.
  • a multiplex communication system a plurality of signal channels, a plurality of vacuum tubes associated with each of said signal channels, a controlling tube for each of said signal channels, circuit connecting each of said signal channels with each other and associating the plate elements of the various vacuum tubes of said channels and the grid elements of the controlling tubes of each of said signal channels, and glow lamp means for controlling the time of operation of each of said signal channels in proportion to the signal intensity reaching the control tube of each of said channels, and means for successively and continuously transmitting energy from said signal channels.
  • a multiplex comnninication system a plurality of signal channels, a plurality of vacuum tubes associated with each of said signal channels, a controlling tube in each of said signal channels, means for introducing signals of dillerent frequencies upon each of said signal channels, means for cyclically and at interrupted intervals controlling the grid potentia-lon the controlling tube in accordance with the signal strength applied, a modulator associated with each of said signal channels, an oscillator of different frequency associated with each of said signal channels, a common load circuit for all of said oscillators, means for associating each of said oscillators with said common load circuit, means provided by said modulator for modulating energy generated by said oscillator in accordance with the signals transmitted through said signal channels and means for cyclically, successively, and at variable rates of speed governed in accordance with the signal intensity applied to said signal channels controlling the time of action of said oscillators upon a said common load circuit.
  • a multiple: communication system a plurality of signal channels, a plurality of vacuum tubes included in each of said signal channels, a controlling tube for each of said signal channels, a grid resistor associated with each of said controlling tubes, means for cyclically changing the grid potential upon each of said controlling tubes at periods when signals reach the same whereby for predetermined signal strengthpredetermined grid potentials are established, means provided by said controlling tube for correspondingly changing the grid potential 65 on all the other tubes of each of said signal channels, means provided by variations in signal strength reaching each of said controlling tubesior proportionately delaying and accentuating the time of signal travel through each of said signal channels, an oscil 7 lator of different frequency associated with each of said signal channels, a common load circuit associated with all of said oscillators,
  • time controlled signal channels for controlling the time of"7f5 operation of each of said oscillators upon said load circuit.
  • the system claimed in claim 21 comprising, in addition, means for associating one tube in each signal channel with one tube of each other channel and regulating the potential bias on the controlling tube of eachQO other signal channel in accordance with the current strength in each of said tubes.
  • the .method of obtaining multiplex communication with a plurality of signal channels which comprises impressing signals upon each of a plurality of' signal channels and cyclically varying the time of operation of each of said channels in accordance with the strength of said impressed signal impulses for transmitting energy from said plurality of signal'channels in accordance with said varyingtime rate of operation.
  • the method of obtaining multiplex communication with a plurality of signal channels which includes impressing signals of different characteristics upon each of the plurality of signal channels, transmitting the energy passed through each of the signal channels, and varying the time operation of the transmission period for each of the said signal channels in accordance with the signal intensity of each of the distinct signals impressed on each or" the signal channels.
  • the method of obtaining multiplex communication with a plurality of tone signal channels all coordinated with a single transmission system which includes impressing signals of different tone frequencies upon each of the plurality of signal channels, controlling the time period of passage of signals through each of the signal channels in accordance with the signal intensity of the individually impressed tone frequencies, and sequentially transmitting signals from each of the channels for time periods varying in accordance with the time operation of each of the channels,
  • a thermionic relay system for multipleX telegraphy comprising a vacuum tube circuit for each signal channel and closed circuits so connecting said vacuum tube circuits as to cyclically and periodically cause said vacuum tubes to become operative for variable time periods.
  • a thermionic relay system for multiplex telegraphy comprising a vacuum tube circuit for each signal channel and circuits so connecting said vacuum tube circuits as to cyclically and periodically cause said vacuum tubes to become operative for time periods of durations proportional to the relative signal intensity on each'of the signal channels.
  • a thermionic relay system for multiplex telegraphy comprising a vacuum tube circuit for each of a plurality of signal channels and closed circuits so connecting all 01": said vacuum tube circuits as to cause each of said vacuum tube circuits to become se quentially operative for predetermined variable time periods.
  • a thermionic relay system for multiplex telegraphy comprising a vacuum tube circuit for each of a plurality of signal channels and circuits so connecting each of said thereon.
  • a communication system comprising in combination a plurality of signal channels each including a plurality of vacuum tubes,means for impressing distinct signals upon each of the si nal channels, circuits connecting the vacuum tubes of each of said circuits so as to. form an interconnected net work, means for sequentially switching between said various signal channels so as to cause one of said channels to become operative and the remaining channels inoperative, and means for Varying the time operation of each of said channels in accordance with the strength of signal energy impressed thereon.
  • a thermionic relay system for multiplex telegraphy comprising a Vacuum tube circuit for each of a plurality of signal channels, circuits so connecting said vacuum tube circuits as to sequentially cause one of said vacuum tube circuits to become operative and the remaining'vacuum tube circuits inoperative, and capacity means for varying the time period of operation of each of said vacuum tube circuits in accordance with the signal strength of the independent signals impressed on each of the vacuum tube circuits.
  • a communication system comprising in combination a plurality of signal chan- .nels each including a plurality of vacuum tubes, means for impressing distinct signals upon each of the signal channels, circuits connecting the vacuum tubes of each of said circuits so as to form an interconnected net work, means for sequentially switching between said various signal channels so as to cause one of said channels to become opera- 2 tive and the remaining channels inoperative,
  • An electronic relay system comprising in combination a plurality of signal channels, a plurality of vacuum tubes associated with each of the signal channels, one of the tubes in each of the channels functioning as a control tube for the channel, means provided by the control tube for delaying the time of action of the particular signal channel during time periods when signals are supplied and accentuating the rate of operation of the signal channel during non-signaling periods, and a load circuit associated with all of the signal channels for utilizing the combined energy output from the signal channels in accordance with the rate of operation of .the individual channels.

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US269099A 1928-04-11 1928-04-11 Tube commutator Expired - Lifetime US1873785A (en)

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US269099A US1873785A (en) 1928-04-11 1928-04-11 Tube commutator
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US (1) US1873785A (enrdf_load_stackoverflow)
BE (1) BE359765A (enrdf_load_stackoverflow)
FR (1) FR36670E (enrdf_load_stackoverflow)
GB (1) GB317723A (enrdf_load_stackoverflow)
NL (1) NL23411C (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485886A (en) * 1946-02-21 1949-10-25 Us Navy Triple gate
US2505589A (en) * 1941-10-31 1950-04-25 Rca Corp Color television system
US2521721A (en) * 1946-12-13 1950-09-12 Standard Telephones Cables Ltd Two-way communication system
US2548661A (en) * 1949-02-10 1951-04-10 Bell Telephone Labor Inc Elastic time division multiplex system
US2628274A (en) * 1944-06-27 1953-02-10 John H Homrighous Multiplex television system
US2655652A (en) * 1948-06-28 1953-10-13 John H Homrighous Multiplex time division telephone systems
US2713119A (en) * 1952-07-21 1955-07-12 Adler Benjamin Switching equipment
US2952734A (en) * 1953-04-27 1960-09-13 Nederlanden Staat Radio-telegraph system
US3270321A (en) * 1962-02-02 1966-08-30 Gen Electric Selective data sampling system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505589A (en) * 1941-10-31 1950-04-25 Rca Corp Color television system
US2628274A (en) * 1944-06-27 1953-02-10 John H Homrighous Multiplex television system
US2485886A (en) * 1946-02-21 1949-10-25 Us Navy Triple gate
US2521721A (en) * 1946-12-13 1950-09-12 Standard Telephones Cables Ltd Two-way communication system
US2655652A (en) * 1948-06-28 1953-10-13 John H Homrighous Multiplex time division telephone systems
US2548661A (en) * 1949-02-10 1951-04-10 Bell Telephone Labor Inc Elastic time division multiplex system
US2713119A (en) * 1952-07-21 1955-07-12 Adler Benjamin Switching equipment
US2952734A (en) * 1953-04-27 1960-09-13 Nederlanden Staat Radio-telegraph system
US3270321A (en) * 1962-02-02 1966-08-30 Gen Electric Selective data sampling system

Also Published As

Publication number Publication date
BE359765A (enrdf_load_stackoverflow)
NL23411C (enrdf_load_stackoverflow)
GB317723A (en) 1930-03-27
FR36670E (fr) 1930-08-13

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