US2299229A - Selecting system - Google Patents

Selecting system Download PDF

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Publication number
US2299229A
US2299229A US420461A US42046141A US2299229A US 2299229 A US2299229 A US 2299229A US 420461 A US420461 A US 420461A US 42046141 A US42046141 A US 42046141A US 2299229 A US2299229 A US 2299229A
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US
United States
Prior art keywords
tubes
circuit
current
ionization
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US420461A
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English (en)
Inventor
Nathan I Hall
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US420461A priority Critical patent/US2299229A/en
Application granted granted Critical
Publication of US2299229A publication Critical patent/US2299229A/en
Priority to GB15703/42A priority patent/GB555721A/en
Priority to FR951305D priority patent/FR951305A/fr
Priority to BE475948D priority patent/BE475948A/fr
Priority to NL135446A priority patent/NL72109C/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Definitions

  • This invention relates to selecting systems and particularly to systems in which distinctive s18- nals are used to make selections in a group of lines, circuits, relays or other electrical devices.
  • An object of the invention is to obtain a' higher degree of selectivity.
  • Another object is to increase the number of channels that may be derived from a transmission circuit in a system using frequency discrimination as the basis of selection.
  • the incoming transmission line over which the selective frequency signals are transmitted terminates in a plurality of tuned receiving circuits associated individually with the starting gaps of the several discharge tubes.
  • each reoeiving circuit is tuned to produce its maximum voltage in response to its particular corresponding frequency.
  • the frequency channels are purl posely spaced so closely that the adjacent receiving circuits also respond and produce voltages which are substantial although somewhat less in magnitude than that produced by the receiving circuitdirectlytunedtothsincomingsimal.
  • These tubes are all provided with auxiliary or secondary ionization gaps towhich a transferismade as soon as the initial starting lap has reached the proper degree of ionisation. 8inoe,therefore, the desired 55.
  • the desired tube in the series has its initial gap ionized by a voltage of greater magnitude than that which is simultaneously applied to the initial gaps of the adjacent tubes, the desired tube will be the first to transfer its ionization to the auxiliary gap.
  • the current flow-v ing in a common lockout circuit serves automatically to prevent any other tube in the series from transferring its ionization to the secondary gap.
  • the desired tube completes its final ionization of the main gap to operate the desired relay or other device, whereas all other tubes which may have undergone ionization in response to the incoming signal are rendered inoperative.
  • relays or magnets While these relays or magnets may beemployed for a variety of purposes, they are particularly useful in the operation and control of communication systems. such as telephone systems of the automatic types.
  • the selectionv system here disclosed comprises a transmission line I over which it is desired to select any one of a large number of relays or magnets 2, l, 4, etc., by means ofsignals of distinctive frequencies f1, fr, fs, etc. These signal currents are produced at the sending station by means of any suitable alternating current generatori.
  • the desired frequency may be connected to the transmission linei by any suitable means, such askeys C, 1, Leto.
  • alternating current- 4 is provided with a corresponding series o! individual discharge tubes 8, I0, II, etc. Each oi' these tubes is provided with a main anode, a main cathode, a starting anode and a screen grid element.
  • 4, are connected respectively to the winding terminals of the associated relays 2, 3, 4, the other winding terminals of these relays being connected over a common conductor I5 to a source of rectified I8.
  • 8, I9, are connected directly to a common conductor 20 which in turn is connected through a common resistor 2
  • Each receiving circuit comprises a condenser and an inductive element connected in series; the cir.. cuit 33 includes condenser 33 and inductance 34, the circuit 3
  • 'Ihe condensers are all connected in multiple ⁇ to thetransmission conductor I, and the inductances may be connected to a ground return conductor as illustrated or to a second conductor returning to the transmitting station.
  • the starting a'nodes 21, 28, 29, etc., are connected to the receiving circuits as illustrated through suitable resistors 39, 40, 4
  • the key 'l or similar circuit-closing switch is operated at the transmitting station to prepare a circuit for the transmission of current of frequency f2 over the common transmitting line This circuit may be traced from the source 42, contacts of key l, conductor I and thence to all of the receiving circuits 30,'3I, 32 in ⁇ parallel.
  • is tuned directly to frequency f2, whereas the adjacent circuits 30 and 32 are tuned respectively to the adjacent frequencies f1 and f3.
  • the frequency spacing of the channei is made quite narrowrortle purpose of enlarging the number oi' channels available, or, if the receiving circuits are made less discriminatory in their frequency selectivity for the purpose of reducing the cost of the tuned circuits, or, if both of these conditions prevail, then the voltages applied to the adjacent tubes 9 and (and possibly to the next adjacent tubes not shown), while not as large in magnitude as that applied to the tube I0, will nevertheless be suiiicient to produce initial ionization in the starting gaps of these adjacent tubes.
  • the next step following the ionization of the starting gap of one of these tubes is to transfer the ionization to the auxiliary gap thereof formed by the cathode and the screen grid element.
  • This auxiliary gap ionlzes for the reason that a voltage is applied thereto over the circuit traceable from the source I6 through the common resistor 23, thence in multiple to the screen grid elements of all tubes, across the auxiliary gaps to the cathodes which are similarly multipled, thence over conductor 20 and resistor 2
  • the ionizing voltage applied to the'starting gap of the tube l0 is greater than that applied to the other 20, resistor 2
  • tubes 9 and II The instant -theauxiliary gap l8-23 of tubelt ionizes, current flows from the source I8 through the resistor 28, screen grid 23, cathode I8, conductor 20, resistor 2
  • and 23 lowers the voltage applied to the auxiliary gaps of all tubes vbelow the value necessary to cause thev transfer oi.ionization to the auxiliary gaps of these tubes. Therefore, tubes 3 and although they have succeeded in ionizing their starting gaps, are prevented from transferring their ionization to the auxiliary gaps, which means that they are prevented from further operation.
  • the iiow of vcurrent in the common resistors 2i and 26 likewise reducesv the voltage applied to the auxiliary gap of the preferred tube I3, but since this tube has already succeeded in transferring its 'ionization the sustaining voltage of its auxiliary gap is correspondingly reduced to a value which is substantiallyless than the applied voltage after reduction by the common resistors 2
  • the preferred tube maintains the ionization oi' its auxiliary gap and proceeds immediately to transfer its ionization to the main anode I3.
  • the tube is now fully ionized, and current iiows from the. source I8 over conductor I5 through the winding oi relay 3, anode I3, cathode I3, resistor 2
  • a selecting system comprising a plurality of discharge devices and a plurality of signal receiving circuits, each of which is individual to a corresponding one of said devices, said receiving circuits being tuned respectively to signal currents of a plurality of different frequencies, of a common signal transmitting circuit, a plurality of sources of current of' said different frequencies, means for sending over said transmitting circuit current signals of any' one of said frequencies to produce a voltage in the correspondingly tuned receiving circuit, circuit means for applying said voltage to the particular discharge device which corresponds to said receiving circuit to initiate the discharge of said particular device, and means responsive to the flow of discharge current in said particular device for rendering the other discharge devices inoperative.
  • a selecting system comprising a series of discharge tubes of a common signal transmitting circuit, a plurality of sources of current of different frequencies, means for sending over said transmitting circuit signal currents of any one of said frequencies, a series of signal receiving circuits each of which isA individual to one oi said tubes, each of said receiving circuits being tuned to produce a voltageof given magnitude in response to current of a particular frequency and voltages of lesser magnitude in response to currents of 'other frequencies, circuit means for applying to' the corresponding -tubes the voltages produced in said receiving cirthe maximumireageis applied for rendering ineilectiveall other tubestowhich lesser voltages magnitude in response to current of a particular frequency and voltages of lesser magnitude in response to currents of other frequencies, circuit means for applying to the correspondingtubes the voltages produced in said receiving circuits to initiate the discharge of said tubes when signals of any given frequency are sent over said transmitting circuit, means responsive to the initiation of the discharge of the particular tube to which the maximum voltage is applied forcompleting the discharge thereof, and means common
  • a selecting system comprising a series of discharge tubes, each of which has a starting gap, an auxiliary gap and a main gap, of a common signal transmitting circuit,'a plurality of sources of current of different frequencies, means for sending over said transmitting circuit signal currents of any one of said frequencies, a series of signal receiving circuits each of .which is individual to one of said tubes, each of said receiving circuits being tuned to produce a voltage of given magnitude in response to current of-a particular frequency and voltages of lesser magnitude in response to currents of other frequencies, circuit means for; applying to the starting gaps of the corresponding tubes the voltages in said receiving circuits to initiate the ionization of said tubes .when signals of any given frequency are sent over said transmitting circuit, means for causing the initial ionization of any tube to transfer from the starting gap to the auxiliary gap thereof, the particular tube to which the maximum ionizing voltage is applied from the associated receiving circuit being the first one to transfer its ionization to its auxiliary gap, a lockout circuit common tc
  • the auxiliary gap of said particular tube for applying an opposing .'oltage to all other-tubes to-prevent the corresponding transfer ⁇ of ionization in any other tube which may have ionized its starting gap simultaneously with the starting gap of said parvticular tube, and means for causing the ionization of said particular tube to transfer to the main gap thereof.
  • a selecting system comprising a series of discharge tubes of a common signal transmitting circuit, a plurality of sources of current of different frequencies, means for Vsending over said transmitting circuit signal currents of any oneof said frequencies, a series of signal receiving circuits each of which is individual to one of said tubes, said frequencies being so spaced and said receiving lcircuits so tuned that signal current of any given frequency produces a maximum voltage in the receiving circuit tuned to that frequency and voltages of lesser magnitudeintheadlacentreceivingcircuimeircuit meansforamlyingtothetubea-

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Signal Processing (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
US420461A 1941-11-21 1941-11-26 Selecting system Expired - Lifetime US2299229A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US420461A US2299229A (en) 1941-11-26 1941-11-26 Selecting system
GB15703/42A GB555721A (en) 1941-11-21 1942-11-06 Electric selecting systems
FR951305D FR951305A (fr) 1941-11-26 1947-08-05 Système sélecteur
BE475948D BE475948A (fr) 1941-11-26 1947-09-11 Système sélecteur
NL135446A NL72109C (en, 2012) 1941-11-26 1947-10-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US420461A US2299229A (en) 1941-11-26 1941-11-26 Selecting system

Publications (1)

Publication Number Publication Date
US2299229A true US2299229A (en) 1942-10-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
US420461A Expired - Lifetime US2299229A (en) 1941-11-21 1941-11-26 Selecting system

Country Status (4)

Country Link
US (1) US2299229A (en, 2012)
BE (1) BE475948A (en, 2012)
FR (1) FR951305A (en, 2012)
NL (1) NL72109C (en, 2012)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542807A (en) * 1946-10-24 1951-02-20 Westinghouse Electric Corp Electronic transfer unit
US2734950A (en) * 1956-02-14 Circuit for preventing intermoduiation
US2774820A (en) * 1952-02-13 1956-12-18 Int Standard Electric Corp Electric discharge tube circuits
US2792525A (en) * 1952-02-23 1957-05-14 Gen Dynamics Corp Time selection circuit
US2811310A (en) * 1952-02-15 1957-10-29 Telecomputing Corp Double purpose gas filled tube
US2964680A (en) * 1957-12-31 1960-12-13 Bell Telephone Labor Inc Gas diode flip-flop or register circuit
US3202841A (en) * 1963-04-01 1965-08-24 Clary Corp Switching network
US3255389A (en) * 1962-04-25 1966-06-07 Gen Electric Electrical capacitor and electrode material therefor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734950A (en) * 1956-02-14 Circuit for preventing intermoduiation
US2542807A (en) * 1946-10-24 1951-02-20 Westinghouse Electric Corp Electronic transfer unit
US2774820A (en) * 1952-02-13 1956-12-18 Int Standard Electric Corp Electric discharge tube circuits
US2811310A (en) * 1952-02-15 1957-10-29 Telecomputing Corp Double purpose gas filled tube
US2792525A (en) * 1952-02-23 1957-05-14 Gen Dynamics Corp Time selection circuit
US2964680A (en) * 1957-12-31 1960-12-13 Bell Telephone Labor Inc Gas diode flip-flop or register circuit
US3255389A (en) * 1962-04-25 1966-06-07 Gen Electric Electrical capacitor and electrode material therefor
US3202841A (en) * 1963-04-01 1965-08-24 Clary Corp Switching network

Also Published As

Publication number Publication date
FR951305A (fr) 1949-10-21
BE475948A (fr) 1947-10-31
NL72109C (en, 2012) 1953-04-15

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