US2474234A - Electrical signal transmission system - Google Patents

Electrical signal transmission system Download PDF

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Publication number
US2474234A
US2474234A US481511A US48151143A US2474234A US 2474234 A US2474234 A US 2474234A US 481511 A US481511 A US 481511A US 48151143 A US48151143 A US 48151143A US 2474234 A US2474234 A US 2474234A
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United States
Prior art keywords
relay
tube
potential
signal transmission
frequency
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Expired - Lifetime
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US481511A
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English (en)
Inventor
Vriendt Charles De
Lucien A B Cabes
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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Publication of US2474234A publication Critical patent/US2474234A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4426—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using two or more signalling frequencies, transmitted in succession or simultaneously

Definitions

  • the invention relates to signal transmission systems and more particularly to pulse-receiving circuits.
  • Fig. 1 shows a schematic "circuit arrangement according to "thepres'ent invention, whiie'Fig. 2 shows a modification thereof.
  • IMP designates an impulse sender, which may be the dial of a telephone apparatus, or a mechanical impulse machine, or any other similar appliance.
  • Relay Sr is the stepping relay at the sending end, which connects one of the different frequencies f1 and f2 to the signalling wire.
  • One filter consisting of condenser C1 and inductance S is tuned in such a way that resonance occurs with frequency 3h.
  • the other .fi1ter consistsofrcondenser Czand the primary winding of transformer T, which winding islshunted by condenser 'C3.
  • the second filter is tuned :insuch a way, that resonance occurs with frequency .fz.
  • the cold-cathode 'tubes referred to in this invention are of the well-known .type, which :requires .a specific control "gap breakdown potential Va: .inaorder to ionize the control gap between the two electrodes 'ei and -62, whereas a substantially higher main gap breakdown potential v 'is required to'ionize this main gap between the anode A and each of the 'two electrodes er and 22.
  • control gap has been ionized, 'however, a 'substaining potential'Vz, which may be considerably lower than V ,.issuiiicient to maintain a current in themaingap.
  • tube-L1 is connected in series whilerelay'Ar while the anode of tube L2 is'connected inseries-with relay Am.
  • the electrodes e2 are connected "to the negative sides of a potentiometer P, which is connected in parallel to a battery of volts. while the-electrodes e1 (thecontrolelectrodes) are connected toza biasing potentialon-the potentiometer, which is smaller-thanthe control gap breakdown voltage required to ionise the control @gap.
  • the twolcontrolling relays An and -AT2 '001ilS10l the two cold-cathode tubes in a manner as will be:described.below.
  • Relay -A1'1 is the actual tube control relay, whereas "relay ATz is the sig-nalreproducing relay.
  • the controlling :circuit at the sending end connects a potential of frequency f1 to the signalling wire via the back contact of relay Sr.
  • the control gap is consequently ionised. :At this moment the anode circuit-0f tube L1 is still open at the right front contact of relay :Arz, so that nothing further happens.
  • this relay operates and connects a potential of frequency f2 (instead of ii) to the signalling wire.
  • This potential causes a current to flow through the second filter C2-T, which is tuned to the frequency f2, thereby inducing in the secondary winding of transformer T a potential, which is added to the biasing potential of electrode 01 0f tube L2, and which increases this potential 'to such an extent that the control gap breakdown voltage is reached.
  • the control gap is "consequently ionised, resulting in the immediate ionisation of the maingap and the operationof relay Am in the anode circuit of the tube L2.
  • this relay closes the receiving end signal circuit via its left front contact and prepares the anode circuit of relay ATI over its right front contact.
  • Relay Ari therefore operates and as soon the armature leaves the back contact, the anode circuit of tube L2 is opened, whereupon this tube extinguishes. As a consequence relay Ar2 releases, opening the receiving end signal circuit and interrupting the anode circuit of tube L1, thus causing the release of relay A11.
  • the control gap of tube L1 remains ionised due to the presence of a potential of frequency ii on the signalling wire, as explained above.
  • a non-inductive resistance T4 is connected in parallel to the winding of relay Arm for the purpose of discharging the relay as soon as its operating circuit is opened. This is desirable in order to speed up the de-ionisation of tube L1.
  • Fig. 1 provides a very sensitive signal transmission, suitable for instance for application in local impulse transmitting circuits or similar circuits for transmission over long distances.
  • each pulse or signal comprises two components of different frequencies, which are separated at the receiving end by adequate filters, each of the two different components being utilised to ionize alternately a cold-cathode tube.
  • Fig. 2 an alternative arrangement is shown, which differs from Fig. 1 in the manner in which the anode circuits of the tubes have been designed.
  • the anode control relay has been replaced by a condenser C4, while the signal relay Ara has been connected in series with both anodes.
  • a frequency ii is connected to a signalling wire and, as previously explained, tube L1 is ionised, an anode current now flowing through the resistance 1'3. Since the sustaining voltage of tube L1 is about 75 volts, the potential at point a will be about 55 volts with respect to point 0. Condenser 04 will consequently be charged in a direction indicated by and in full lines, since point 2) is of the same potential as point 0.
  • Point 1 will then attain the same potential as point 0 and the original conditions will again be re-established.
  • An electrical signal transmission system comprising a transmission line, signal transmission apparatus connected to one terminal of said line, said signal transmission apparatus comprising means to transmit alternate impulses of two different frequencies, means connected to the opposite end of said line for receiving said impulses said receiving means comprising a pair of circuits, means in one circuit responsive to energy of one of said frequencies applied thereto to register the beginning of an impulse and means in the other of said circuits responsive to energy of the other oi said frequencies applied thereto to register the end of an impulse and relay means associated with said receiving means jointly controlled by both of said circuits for retransmitting signals measured by the two frequencies of each impulse received.
  • said signal transmitting device comprises a substation dial, a relay controlled thereby, contact means for said relay including a tongue, front and back contacts cooperating therewith, a source of a first signalling frequency potential connected to said back contact, a source of a different frequency potentialconnected to said front contact, said tongue being connected to said transmission line.
  • said receiving means comprises electrical filter means for segregating the two currents of different frequencies, a pair of cold cathode tubes, circuits connecting the control electrodes of the respective tubes to said filter means so that each tube is operated by a separate frequency.
  • said receiving means comprises electrical filter means for segregating the two currents of different frequencies, a pair of cold cathode tubes, circuits connecting the control electrodes of the respective tubes to said filter means so that each tube is operated by a separate frequency, a common source of biasing potential for each tube of such value that each signal component received will cause the operation of the corresponding tube.
  • said receiving means comprises electrical filter means for segregating the two frequency components of the respective impulses a pair of cold cathode tubes, circuits connecting the control electrodes of the respective tubes to said filter means so that each tube is operated by a separate frequency of the received impulses, a pair of relays, of which one is connected in the anode circuit of each of said tubes whereby the relays operate on the operation of the corresponding tube, and circuits controlled from the contacts of the respective relays for controlling the extinguishing of said tubes.
  • An electrical signal transmission system comprising a transmission line, signal transmission apparatus connected to said line, said apparatus comprising means to transmit alternate impulses of two different frequencies, means connected to the opposite end of said line for receiving said impulses, said receiving means comprising electrical filter means, for segregating the frequencies of the respective impulses, a pair of cold cathode tubes, a circuit connecting the control electrode of each of said tubes to said filter means so that each tube responds to the application of energy of a different frequency of the respective impulses, a relay connected in the anode circuit of each tube, the relay associated with the first of said tubes being connected in an operating circuit including the back contact of the other relay, while the operating circuit of the latter relay includes the front contacts of the relay associated with the first of said tubes, the arrangement being such that the first of said tubes and the relay associated therewith operates an impulse of the first frequency and closes at its front contacts an operating circuit for the other relay which operates when the second of said tubes is operated by receipt of impulse the second frequency thereby at its back contact opening the circuit for the first of said tubes and the associated relay
  • An electrical signal transmission system comprising a transmission line, signal transmission apparatus connected thereto, said apparatus comprising means to transmit alternate impulses of two different frequencies, one of said frequencies indicating the beginning of an impulse and the other the end thereof, receiving means connected to said line comprising electric filter means for segregating said respective frequencies, a pair of electronic tubes operatively connected to said filter means whereby one tube responds to application of energy of an impulse of one frequency and the other tube to application of energy of an impulse of the other frequency, relay means connected to the output circuit of said tubes so as to respond to the operation thereof, and means controlled by said relay means for retransmitting impulses.
  • a signal transmission system in which said relay means is a single relay.
  • a signal transmission system in which said relay means comprises a single neutral relay.
  • a signal transmission system in which said relay means comprises a single neutral relay and in which condenser means connected across the output of said electronic tubes is used to control said relay means.
  • a signal transmission system in which said relay means comprises a single neutral relay and in which a condenser is connected between the output electrodes of said electronic tubes, said condenser being used to control said relay means.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electrotherapy Devices (AREA)
US481511A 1941-06-21 1943-04-01 Electrical signal transmission system Expired - Lifetime US2474234A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2474234X 1941-06-21

Publications (1)

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US2474234A true US2474234A (en) 1949-06-28

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Application Number Title Priority Date Filing Date
US481511A Expired - Lifetime US2474234A (en) 1941-06-21 1943-04-01 Electrical signal transmission system

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US (1) US2474234A (enrdf_load_stackoverflow)
BE (1) BE446491A (enrdf_load_stackoverflow)
FR (1) FR882438A (enrdf_load_stackoverflow)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2045735A (en) * 1934-05-26 1936-06-30 American Telephone & Telegraph Radio receiving circuits

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2045735A (en) * 1934-05-26 1936-06-30 American Telephone & Telegraph Radio receiving circuits

Also Published As

Publication number Publication date
BE446491A (enrdf_load_stackoverflow)
FR882438A (fr) 1943-06-02

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