US2294464A - Impulse transmitter - Google Patents

Impulse transmitter Download PDF

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US2294464A
US2294464A US201076A US20107638A US2294464A US 2294464 A US2294464 A US 2294464A US 201076 A US201076 A US 201076A US 20107638 A US20107638 A US 20107638A US 2294464 A US2294464 A US 2294464A
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Prior art keywords
relay
condenser
conductor
circuit
pulsing
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US201076A
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English (en)
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Frederick R Lamberty
George W Weaver
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AT&T Corp
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Bell Telephone Laboratories Inc
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Priority to US201076A priority Critical patent/US2294464A/en
Priority to FR852823D priority patent/FR852823A/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/272—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial

Definitions

  • VThis invention relates to impulse transmitters and more particularly to keyset controlled senders for transmitting series of impulses for setting Selector switches to establish connections to subscribers lines.
  • the present invention is of the general type disclosed in Patent No. 2,002,219 granted May 21, 1935 to T. L. Dimond, whereby a subscriber or an operator at a' private branch exchange or at a manual board of an automatic exchange system may be keying the digits of a desired line designation on a ten-button keyset cause the registration of vsuch keyed digits in a controlling sender which will then function in accordance with the registered digits to set up connections to the desired line.
  • condensers serving as registers for recording the successive digits keyed and to employ a gas-filled tube controlled successively by the condensers for counting the impulses in each series transmitted by the sender.
  • the condensers are successively connected to the keyset by a train of steering relays which are operated in succession in response to the successive depression and release of keys of the keyset, each condenser being charged to a degree commensurate with the Value of the digit being keyed at the time such condenser is associated with the keyset.
  • the impulse counting device comprises a gas-filled tube which is of such a character that it breaks down or becomes conducting when the potential on its control or grid element is raised to a critical value.
  • the impulse counting device including the tube is successively associated with the condensers by the successive release of operated steering relays.
  • a condenser which will be termed a bucket condenser, connected to the grid of the tube, is associated with the register condenser corresponding to the digit being transmitted whereby the potential across the bucket condenser and the serially connected register condenser is raised to the potential of the register condenser.
  • a further condenser Associated with the bucket condenser is a further condenser, termed a dipper condenser, which under the control of the impulse generating relay is alternately charged to a denite potential and then discharged into the bucket condenser thus raising the potential across the terminals of the bucket condenser by predetermined increments and consequently raising the potential on the grid of the tube by the same increments until such condenser has received su'icient increments to raise the total charge across the bucket condenser and serially connected register condenser to ten increments whereupon the tube will flash and will'operate an anode relay to arrest further operation of the pulsing relays, to restore the tube to its normal condition vand to prepare circuits for measuring a delay interval before transmitting the next digii-l series.
  • a dipper condenser which under the control of the impulse generating relay is alternately charged to a denite potential and then discharged into the bucket condenser thus raising the potential across the
  • the bucketcondenser is disassociated from any register condenser, but the dipper condenser is alternately charged and discharged into the bucket condenser until the bucket condenser has accumulated a charge equal to the breakdown potentialof the tube whereupon the tube will fire to operate the anode relay to terminate the time interval and to prepare the sender circuit for out-pulsing in accordance with the next registered digit.
  • the operated steering relays are successively released to-associate successively charged register condensers with the bucket condenser and the grid of the tube, provision being made to arrest outpulsing whenever the time interval following the out-pulsing for the last digit keyed and registered on a register condenser has been terminated.
  • Fig. 1 shows a calling subscribers substation circuit and associated keyset, the diagrammatic illustration of a called line and selector switches for establishing a connection from the calling subscribers line to such called line and a portion of the sender equipment;
  • Fig. 2 shows further relay equipment of the sender
  • Fig. 3 shows the register condensers and steering relays of the sender.
  • the keys of the keyset have digital values of l to 0, inclusive, and are of the non-locking type.
  • to 309, inclusive, of Fig. 3 serve to connect the digit register condensers 3H to 3
  • Condenser 203 charges in the previously traced circuit and the charging current flowing through the lower windings of pulsing relays
  • Relay 208 operates and locks in a circuit from battery through its winding, back contact of relay 200, front contact of relay 208, upper winding of relay 2
  • Relay 200 also bridges the volt battery 2
  • the other junctions between the resistances of the potential divider are connected to the outer left contacts of the keys of theY keyset
  • upon operating locks in a circuit from battery through its winding and inner upper front contact, over conductor 32
  • 9 may be traced from the right terminal of the winding of relay 2
  • the operating circuit of relay 300 may 'be traced from battery through the winding and inner lower normal contacts of relay 300, middle lower front contact of relay 30
  • Relay 300 upon operating locks over its inner lower alternate .contacts to ground on conductor 2
  • Relay 300 also 'closes circuits for relays 2
  • operates, but the winding or relay 2
  • Relay 246 upon operating locks over its upper inner alternate contacts, back contact of relay 229, conductor 220, lower front contact of relay 300 to ground on conductor 2
  • relay 206 With steering relay 30
  • 2 is thus charged to ⁇ a potential equal to the drop across resistances
  • Relay 302 upon operating locks in a circuit from battery through its winding and inner upper front contact, middle lower front contact of relay 30
  • relay 206 When the subscriber depresses the No. 9 key
  • Relay 303 upon operating locks in a circuit from battery through its winding and inner upper front con tact, middle lower front contact of relay 302 to ground on conductor 2 I5; opens at its upper back contact the charging circuit for register cone denser 3
  • the previously traced shunt of relay 250, established by the operation of relay 302, is now opened at the inner lower contacts of relay 303.
  • relay 206 When the subscriber depresses the No. 8 kei7
  • Relay 200 upon operating opens the locking circuit of relay 208 previously traced through the upper winding of relay 2
  • Relay 304 upon operating locks in a circuit from lbattery through its winding and inner upper front contact, middle lower front contact of relay 303 to ground on conductor 2
  • 0, established by the operation of relay 303, is now opened at the inner lower contacts of relay 304.
  • 0 function in response to the operation and release of relay 200 in such a manner that relay 2
  • relay 225 With relay 225 now operated ground is connected from conductor 2 l5 over the upper front contact of relay 225 to the armature of relay
  • 08 continue to operate their armatures from their right to their left contacts at a rate determined by the charging and discharging times of condenser 203, or at a rate determined by the best conditions for the transmission of selector setting impulses.
  • Relay 225 upon operating in addition to controlling the operation of the pulsing relays
  • Relay 221 upon operating locks over a circuit in series with the winding oi relay 230, the upper front contact of relay 221, the lower front contact of relay 225, to ground on conductor 2
  • Relay 221 also closes a circuit for relay
  • 08 operates in the locking circuit of relay 221 and establishes the operating circuit of relay
  • 54 upon operating opens the shunt around the contacts of pulsing relay
  • This circuit extends from the positive terminal of battery 2
  • relay 230 With relay 230 operated a circuit is established from the grid of the tube, through resistance
  • 01 On the next operation of the armatures of pulsing relays
  • 41 operates and at its right front contact establishes a holding circuit for relay
  • is of such capacity that it now charges to a potential substantially equal to one increment of the potential previously applied during the keying operation across the terminals of register condenser 3
  • 08 again move their armatures to the right
  • 01 again closes the out-pulsing loop to terminate the rst transmitted impulse
  • 00 opens the operating circuit of secondary pulsing relay
  • now discharges into condenser
  • This latter circuit may be traced from ground over the cathode-anode path of the tube, thence as traced through the winding of anode relay 2
  • 8 operates, establishing a circuit from the junction between the winding of secondary pulsing relay and resistance
  • 4 operates over the previously traced circuit and locks over its alternate contacts to ground on conductor 205, but relay 2
  • Relay 225 upon releasing closes at its upper back contact the resistance shunt around bucket condenser
  • 8 upon releasing removes the shunt from the winding of secondary pulsing relay
  • 6 now releases closing a holding circuit for relay 2
  • 1 With relay 2
  • Relay 225 upon operating again removes the shunt from bucket condenser
  • is alternately charged and discharged into condenser
  • 0 to the breakdown point thus measures a sufiicient delay interval to give the iirst selector
  • anode relay 2 I8 When anode relay 2 I8 operates, it again shunts relay
  • Relay 225 upon releasing reestablishes the discharge shunt around condenser 130, removes ground from the armature of pulsing relay 108 to arrest the operation of pulsing relays 101. and 108 and opens the cathode-anode circuit through tube 110 to extingush the tube and to releane anode relay 218.
  • Relay 218 upon releasing removes the shunt from the winding of the secondary pulsing relay 141 and establishes a circuit for reoperating relay 216 which may be traced from ground on conductor 220, back contact of relay 219, back contact of relay 218, normal contacts and Winding of relay 216, through resistance 224 to battery.
  • relay 216 operated and relay 211 released the previously traced operating circuit for relay 225 is established and relay 225 reoperates to remove the shunt from condenser 130, to restart the operation of pulsing relays 101 and 108 and to connect the positive terminal of battery 211 through the winding of anode relay 218 to the anode of the tube.
  • relay 221 Upon the first engagement of the armature of pulsing relay 108 with its left contact, with relays 216 and 225 now operated, the circuit of relay 221 is established from battry, through the winding of relay 221, lower back contact of relay 230, upper front contact of relay 218, conductor 231, left contact of relay 108, upper front contact of relay 225 to ground on conductor 215 and relay 221 operates, again es tablishing the operating circuit of relay 144 and closing a previously traced locking circuit for itself extending through the winding of relay 238.
  • Relay 230 operates in this locking circuit as soon as pulsing relay 108 opens its left contact, causing the reoperation of relay 154 which thereupon renders the pulsing contacts of pulsing relay 101 effective for transmitting impulses to the second selector switch 155.
  • Relay 213 upon operating opens at its lower transfer contacts the locking circuit of steering relay 381 which thereupon releases and establishes a new holding circuit for steering relay 302 to replace the holding circuit therefor previously traced over the middle lower front contact of steering relay 381.
  • the new holding circuit for relay 352 may be traced from battery through the winding and inner upper front contact of relay 302, conductor 323, lower alternate contacts of relay 213 to ground on conductor 215.
  • the release of steering relay 301 disconnects the register condenser 311 from the impulse counting device and associates register condenser 312 therewith.
  • relay 230 With relay 230 operated a circuit is established from the grid 1&1 of the tube through resistance 148, condenser 13B, normal contacts of key 149, conductor 239, upper front contact of relay 230, conductor 233, the upper middle back contact of steering relay 381, the upper middle front contact of steering relay 382, condenser 312, upper contacts of relay 330, conductor 229, inner lower front contact of relay 225, conductor 142, resistances 141 and 148 to ground at resistance 140 whereby condensers 130 and 3i2 are connected in series.
  • relay 101 opens the out-pulsing loop to transmit one impulse to the second selector 155 and relay 188 establishes the circuit previously traced over the upper front contact of relay 216, the lower front contact of relay 230 and conductor 234 for operating the secondary pulsing relay 141 which closes the charging circuit of dipper condenser 151.
  • relay 101 recloses the outpulsing loop to terminate the rst transmitted impulse and relay 108 opens the circuit of relay 141 which now releases and connects condenser 151 into a discharge path through the condenser 130.
  • the out-pulsing loop is opened and closed and relay 141 is operated and released to charge condenser 151 and to discharge it into condenser 130.
  • Relay 218 upon operating again shunts relay 141 in its non-operated position and at its back contact opens the shunt around the winding of relay 211.
  • Relay 211 now operates opening at its upper back contact the circuit of relay 154 which thereupon releases to shunt the pulsing contacts of pulsing relay 101 thereby rendering the further operation of pulsing relay 101 ineiective to transmit impulses to the second selector.
  • At its lower back contact relay 211 also opens the circuit of relay 225 which then releases, and connects ground from conductor 215 over its lower front contact, the upper front contact of relay 213 to the junction between resistance 236 and the winding of relay 214 whereupon relay 214 is shunted and releases.
  • Relay 225 upon releasing closes the discharge shunt around condenser 138 to fully discharge it, removes ground from the armature of pulsing relay 108 to arrest further operation of pulsing relays 101 and 188, opens the cathodeanode circuit through the tube thereby extinguishing the tube and releasing anode relay 218 and opens the locking circuits of relays 221 and 235 which thereupon release.
  • Relay 221 upon releasing in turn releases relay 144.
  • Relay 225 upon reoperating removes the shunt from condenser 130; connects ground to the armature of pulsing relay 108 to 'cause relays 101 and 108 to again operate intermittently and reconnects the positive terminal of battery 211 through the winding of anode relay 218 to the anode of the tube.
  • relay 141 is operated to close the -previously traced charging circuit for dipper condenser, 151.
  • 08 continues to operate, the dipper condenser
  • the time required to raise the potential on the grid of the tube to the breakdown point thus measures a sufcient delay interval to give the second selector
  • 8 When anode relay 2
  • Relay 225 upon releasing establishes the shunt around condenser
  • 8 upon releasing removes the shunt from the winding of pulsing relay
  • 6 operated and relay 2
  • relay 221 Upon the rst engagement of the armature of pulsing relay
  • Relay 230 operates in the locking circuit of relay 221 upon the next opening of the left contact of pulsing relay
  • 3 upon releasing opens at its transfer contacts the locking circuit of steering relay 302 which thereupon releases and establishes a new holding circuit for steering relay 303 to replace the holding circuit therefor previously traced over the middle lower front contact of steering relay 302.
  • the new holding circuit for relay 303 may be traced from battery, through the winding and inner upper front contact thereof, inner upper back contact of steering relay 30
  • the release of steering relay 302 disconnects the register condenser 3
  • relay 230 With relay 230 operated a circuit is established from the grid of the tube, through resistance
  • 01 On the next operation of the armatures of pulsing relays
  • 01 On the next operation of the armatures of relays
  • 01 recloses the out-pulsing loop terminating the first impulse transmitted to connector
  • This total potential applied to grid of the tube will cause the tube to break down establishing a discharge path for condensers
  • 8 upon operating again shunts relay
  • 1 now operates, opening at its back contact the circuit of relay
  • Relay 225 upon releasing closes the discharge shunt around condenser
  • 6 With relay 2
  • Relay 225 upon reoperating removes the shunt from condenser
  • 41 is operated to close the previously traced charging circuit for dipper condenser
  • is alternately charged and discharged into condenser
  • a time interval has thus been measured. During this time interval, due to the fact that relay
  • 8 When anode relay 2
  • Relay 225 upon releasingv reestablishes the discharge shunt for condenser
  • 8 upon releasing removes the shunt from the winding of pulsing relay
  • 1 released a previously traced circuit is established for relay 225 which reoperates, removes the shunt from condenser
  • relay 221 Upon the rst engagement of the armature of pulsing relay
  • Relay 230 operates in the locking circuit of relay 221 as soon as pulsing relay
  • 3 upon operating opens at its transfer contactsV the locking circuit of steering relay 303 which thereupon releases and establishes a new holding circuit for steering relay 304 to replace the holding circuit therefor previously'traced' over theV middle lower iront contact of steering relay 303.
  • the new holding circuit of relay 304 may beftraced from battery through the winding and inner upper front contact thereof, inner upper bac'k contact of steering relay 302, conductor 323, alternate contacts of relay 2
  • the release of steeringl relay 303 disconnects the register condenser 3
  • relay 230 With relay 230 operated a circuit is established .from the grid of tube
  • 01 opens the out-pulsing loop' to transmit an impulse to stepA the connector switch
  • 01 closes the out-pulsing loop-to terminate the rst impulsel and relay
  • 41 is operated and released to charge condenser
  • '8 upon operating againv shunts relay
  • 1 now operates opening at its upperback contact the circuit of relay
  • Relay 225 upon releasing closes the discharge shunt around condenser to fully discharge it, removes ground from the armature of pulsing relay
  • 6 With relay 2
  • Relay 225 upon operating removes the shunt from condenser
  • 41 is operated to close the Prev1- ously traced charging circuit for dipper condenser
  • 41 releases and as previously described, connects condenser
  • the connector switch Since the connector switch has now been set upon the terminals of the wanted line
  • anode relay 2 i8 When anode relay 2 i8 operates it again shunts relay
  • Relay 225 upon releasing reestabllshes the discharge shunt for condenser
  • 3 upon releasing opens at its transfer contacts one locking circuit of steering relay 304 which may be traced from battery through the winding and inner upper front contact of relay 304, inner upper back contact of steering relay 302, conductor 323, contacts of relay 2 I3 to ground on conductor 2
  • 9 upon operating removes ground from the armature of anode relay 2
  • 3 is operated as previously described. With no other steering relay yet operated, the operation of relay 2
  • 9 upon operating removes ground from the armature of anode relay 2
  • 9 When the next digit is keyed and steering relay 302 operates, the winding of relay 2
  • a similar condition occurs at any time that the sender has pulsed out all the digits keyed by the subscriber.
  • 4 act as counting relays, relay 2
  • 4 operates at the end of out-pulsing for each odd digit series
  • 3 operates at the end of the following time interval
  • 4 releases at the end of the outpulsing for each even digit series
  • ll not operated will, as previously described, cause the operation of relay 2
  • relay 2m operates in the locking circuit of relay 2&8, as previously described, and establishes a circuit for steering relay 393 which may be traced from battery, through the winding of relay 399, the upper front Contact of relay 3&8, conductor 3
  • the provision for enabling the registration of nine digits has particular utility when the circuits are installed on a subscribers line of a private branch exchange.
  • the subscriber would key a first digit to obtain access to a trunk outgoing to a central office and would then wait before keying the digits of the directory number of a desired subscribers line until after a dialing tone has been received from the central oice.
  • rl'he establishment of the connection to the central oice restores the' rst register condenser 3H to its discharged or normal condition' as previously described.
  • the subscriber Having received the dial tone from the central o-ice the subscriber would then proceed to key the digits oi the desired line designation which might comprise seven digits to reach the subscribers linev and an eighth digit to indicate the desired party on the line should the desired subscriber be located on a party line. 'Ihe first seven digits of the line number would be registered on condensers SI2 to SIBv inclusive and the eighth digit would be registered on condenser 3
  • the key IM)i is first operated.
  • the operation oi the key will connect battery over its upper alternate contacts to the ilament circuit ofl the tube and will connect both the keyset potential.
  • the left end of ,theV keyset potential divider is conneet-ed over conductor
  • the left end' of the pulsing potential divider is connected over conductor to the positive terminal Yor" battery 2
  • test key 231 is operated thus connecting the positive terminal of battery 2
  • the potential applied to the grid should re the tube and if the tube is thus conducting it will be indicated by the operation of anode relay 2
  • 50 of the pulsing potential divider should be moved until the tube becomes conducting. The correct adjustment will be a point at which a minimum variation in the potential divider will distinguish between the operation and' non-operation of the tube with the key 231 operated. When the adjustment is completed both keys
  • a gaseous conductor device having a definite breakdown potential, a rst condenser, means for placing a variable charge on said condenser, a second condenser, means for connecting said condensers in series in a path across the terminals of said device, a third condenser, a charging circuit for said third condenser, and means for charging said secon'd condenser in steps by connecting said third condenser alternately into said charging circuit and in parallel with said second condenser, said device becoming conducting when the sum of the charges on said first and second condensers reaches the breakdown potential of said device.
  • a gaseous conductor device having a definite breakdown potential
  • a rst condenser means including a keyset for placing a charge on said condenser commensurate with the digital value of the operated key of said keyset, a second condenser, means for connecting said condensers in series in a path across the terminals of said device, athird condenser, a'
  • a first condenser serving as a digit register, means including a keyset for placing a charge on said condenser commensurate with the digital value of the operated key of said keyset, means for generating impulses, an impulse counting means comprising a gaseous conductor device having a denite breakdown potential, a second condenser, means for connecting said condensers in series in a path across the terminal-s of said device, a third condenser, a charging circuit for said third condenser, means controlled by said impulse generating means for charging I said second condenser in steps by connecting said third condenser alternately into said charging circuit and in parallel with said second condenser, said device becoming conducting when the sum of the charges on said first and second condensers reaches the breakdown potential of said device, and means responsive when said device becomes conducting for arresting the operation of said impulse generating means.
  • a group of rst condensers serving as digit registers, a keyset, a group of stearing relays, means for successively operating said relays, means operated by the successive operation of said relays to successively connect said condensers with said keyset, means controlled by said keyset for placing a charge on each of said condensers when associated therewith in accordance with the digital value of an operated key, means for generating series of impulses, an impulse counting means comprising a gaseous conductor device having a definite breakdown potential, a second condenser, a third condenser, a charging circuit for said third condenser, and means controlled by said impulse generating means for charging said second condenser in steps by connecting said third condenser alternately into said charging circuit and in parallel with said second condenser, means for successively releasing said relays, means operated by the successive release of said relays to successively connect said first condensers in series with said second condenser in a path across the terminal
  • a group of first condensers serving as digit registers, a keyset, a group of steering relays, means for successively operating said relays, means operated by the successive operation of said relays to successively connect said condensers with said keyset, means controlled by said keyset for placing a charge on each of said condensers when associated therewith in accordance with the digital value of an operated key, means for generating series of impulses, an impulse counting means comprising a gaseous conductor device having a definite breakdown potential, a second condenser, a third condenser, a charging circuit for said third condenser, and means controlled by said impulse generating means for charging said second condenser in steps by connecting said third condenser alternately into said charging circuit and in parallel with said second condenser, means responsive to the operation of the first of said steering relays for connecting the first of said register condensers in series with said second condenser across the terminals of said device and for starting said impulse generating means, said device
  • a group of rst condensers serving as digit registers, a keyset, means operable to successively connect said condensers with said keyset, means controlled by said keyset for placing a charge on each of said condensers when associated therewith in accordance with the digital value of the operated key, means for generating series of impulses, an impulse counting means comprising a gaseous conductor device having a definite breakdown potential, a second condenser, a third condenser, and means controlled by said impulse generating' means for charging said second condenser in steps by alternately charging said third condenser and clischarging it into said second condenser, means operable to successively connect said iirst condensers in series with said second condenser in a path across the terminals of said device, said device becoming conducting when the sum of the charges on the second condenser and on the rst condenser at the time connected in series therewith reaches the breakdown potential of said device
  • a group of rst condensers serving as digit registers, a keyset, means operable to successively connect said condensers with said keyset, means controlled by said keyset for placing a charge on each of said condensers when associated therewith in accordance with the digital value of an operated key, means for generating series of impulses, an impulse countting means comprising a gaseous conductor device having an adjustable breakdown potential, a second condenser, a third condenser, and means controlled by said impulse generating means for charging said second condenser in steps by alternately charging said third condenser and discharging it into said second condenser, means operable to connect each one of said rst condensers in series with said second condenser and said second condenser alone in alternation in a path across ⁇ the terminals of said device, said first condensers being successively connected to said second condenser, means for changing the breakdown potential of said device at such time as said second condens
  • a group of first condensers serving as digit registers, a keyset, means operable to successively connect said condensers with said keyset, means controlled by said keyset for placing a charge on each of said condensers when associated therewith in accordance with the digital value of an operated key, means for generating impulses, impulse counting means perable to alternately count series of impulses commensurate with the values of registered digits and to count series of impulses to measure interposed delay intervals, said counting means comprising a gaseous conductor device, a potential divider for varying the biasing potential of said device, a second condenser, a third condenser, and means controlled by said impulse generating means for charging said second condenser in steps by alternately charging said third condenser and discharging it into said second condenser, means operable to connect said rst condensers in succession in series with said second condenser across the terminals of said device during the counting of digit impulse series whereby said
  • a rst condenser serving as a digit register, means including a keyset for placing a charge on said condenser commensurate with the digital value of the operated key of said keyset, means for generating impulses, an impulse counting means operable first to count a series of impulses commensurate with the value of the registered digit and then to count a series of impulses to measure a delay interval comprising a gas-filled tube having an anode, a cathode and a grid, a potential divider for varying the biasing potential on the grid of said tube, a second condenser, a third condenser, and means controlled by said impulse generating means for charging said second condenser in steps by alternately charging said third condenser and discharging it into said second condenser, means operative to start said impulse generating means and to connect said rst condenser in series with said second condenser across the cathode-grid path through said tube to one point
  • means for determining the value of the recorded digit comprising, means for connecting a potential in series with said condenser and varying the value of said potential in substantially uniform steps, the number of steps required to cause the effective total potential to arrive at a predetermined value thus being a measure of the charge on the condenser and hence characteristic of the digit recorded.
  • two condensers means for charging the rst of said condensers to any of a plurality of diierent values, means for charging the second of said condensers in steps and, after each step, testing the effective total potential of said two condensers in series, means substantially preventing any variation in the amount of charge on said first condenser during each of said testing operations if said effective total potential is below a predetermined value, and means operated when the eiective total potential of the two condensers in series reaches said predetermined Value.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Relay Circuits (AREA)
US201076A 1938-04-09 1938-04-09 Impulse transmitter Expired - Lifetime US2294464A (en)

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US201076A US2294464A (en) 1938-04-09 1938-04-09 Impulse transmitter
FR852823D FR852823A (fr) 1938-04-09 1939-04-07 Systèmes téléphoniques ou analogues

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US201076A US2294464A (en) 1938-04-09 1938-04-09 Impulse transmitter

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US2294464A true US2294464A (en) 1942-09-01

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442702A (en) * 1945-09-20 1948-06-01 Bell Telephone Labor Inc Selective signaling system
US2454780A (en) * 1943-08-28 1948-11-30 Int Standard Electric Corp Telecommunication switching system
US2463708A (en) * 1945-03-10 1949-03-08 Automatic Elect Lab Impulse sender
US2661395A (en) * 1948-11-05 1953-12-01 Ericsson Telefon Ab L M Variable resistance signaling system
US2771599A (en) * 1953-03-06 1956-11-20 Marchant Calculators Inc Readout mechanism

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454780A (en) * 1943-08-28 1948-11-30 Int Standard Electric Corp Telecommunication switching system
US2463708A (en) * 1945-03-10 1949-03-08 Automatic Elect Lab Impulse sender
US2442702A (en) * 1945-09-20 1948-06-01 Bell Telephone Labor Inc Selective signaling system
US2661395A (en) * 1948-11-05 1953-12-01 Ericsson Telefon Ab L M Variable resistance signaling system
US2771599A (en) * 1953-03-06 1956-11-20 Marchant Calculators Inc Readout mechanism

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Publication number Publication date
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