US2250769A - Signaling circuit - Google Patents

Signaling circuit Download PDF

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Publication number
US2250769A
US2250769A US244785A US24478538A US2250769A US 2250769 A US2250769 A US 2250769A US 244785 A US244785 A US 244785A US 24478538 A US24478538 A US 24478538A US 2250769 A US2250769 A US 2250769A
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US
United States
Prior art keywords
line
winding
coil
contact
source
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
US244785A
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English (en)
Inventor
Kieser Max
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.)
Siemens Schweiz AG
Albiswerk Zuerich AG
Original Assignee
Siemens Albis AG
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 Siemens Albis AG filed Critical Siemens Albis AG
Application granted granted Critical
Publication of US2250769A publication Critical patent/US2250769A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines

Definitions

  • This invention relates to circuit arrangements for telephone stations more especially field telephones.
  • Such apparatus besides meeting the usual conditions have special requirements such as the prevention of the outgoing speech currentspassing through the receiver and also the facility for buzzer signaling.
  • the fulfilling of these requirements complicates the circuit and the object of the present invention is to simplify this which is attained by employing the induction coil as a transformer for the buzzer signals and providing the coil with several windings so arranged that the alternating currents produced by the buzzer or the microphone do not produce any audible effect on the telephone receiver of the home station.
  • the drawing shows, as an example, one way of carrying the invention into effect as applied to a so-called field telephone.
  • the field telephone is equipped with a buzzer arrangement which, by means of the buzzer key SuT connects all the necessary contacts which consist of interrupter contact ur with a parallel spark-quenching circuit and the primary winding I of the induction coil Us in series with the battery B.
  • the telephone receiver T of the home station is not influenced by the speech currents since it is nn d y ndenser (:2. between the. wind.-
  • the network N and the line L form a Wheatstone bridge arrangement one diagonal of which consistsiof the telephone receiver T with the condenser cz while across the other diagonal the induced'microphone alternating voltage from the primary winding I of Us is'impressed.
  • the line balancing network is, as a rule, embodied in the winding II by .suitablyfdimensioning this or it is a special resistance winding wound on the induction coil.
  • the received speech currents flow as follows: line a, contact kl, telephone receiver. T, condenser C2, winding III of the induction coil, line b. i
  • windingsII and III of the induction coil induce the windings II andIII alternating currents which are transmitted to the line over the following circuit: windingsII and III of the induction coil, line balancing network N, Su'l, kl, line a, distant station, l'ineb, windings III and II'of the induction coil.
  • the buzzer currents do not enter the telephone receiver.
  • a substation having thereat instrumentalities forthe transmission and reception of speech, a line outgoing from said substation, an induction coil for connecting said instrumentalities to said line, a normally closed contact on said coil adapted to be opened responsive to energization of one winding of said coil, a source of direct current, and means for connecting said source, said contact and said one winding in series to operate as a buzzer.
  • a substation having thereat instrumentalities for the transmission and reception of speech, a line outgoing from said substation, an induction coil for connecting said instrumentalities to said line, a normally closed contact on said coil adapted to be opened responsive to energization of one winding of said coil, a source of direct current, and for connecting said source, said contact and said one winding in series, said contact efiective in said series circuit to repeatedly interrupt the current flow from said source through said one winding, thereby to generate an alternating current in another winding of said induction coil.
  • a substation having thereat instrumentalities for the transmission and reception of speech, a line outgoing from said substation, an induction coil for connecting said instrumentalities to said line, a manually operable device, and means controlled by said device for operating said induction coil to generate and transmit over said line a plurality of complete cycles of alternating current responsive to a single operation of said device.
  • a substation having thereat instrumentalities for the transmission and reception of speech, a line outgoing from said substation, an induction coil for connecting said instrumentalities to said line, a circuit for one winding of said coil, a source of direct current, means for connecting said source to said circuit, said circuit containing a contact operated magnetically by said coil to cause the value of the current flowing through said one winding of said coil from said source to oscillate continuously during the time that said source is connected to said circuit.
  • an outgoing line instrumentalities for the transmission and reception of speech
  • an induction coil means for connecting said instrumentalities to said line through said coil
  • a local source of direct current means for connecting said source to said coil to energize one of its windings
  • a substation having thereat instrumentalities for the transmission andreception of speech, a line outgoing from said substation, an induction coil for connecting said instrumentalities to said line, a source of direct current for said coil, and self-interrupting means for said coil comprising a contact operated magnetically by said coil upon energization of same by said source, said contact efiective upon operation to cause the deenergization of said coil.
  • an induction coil having a primary and two secondary windings, a receiver and one of said secondary windings connected in series across said line, a resistor and the other secondary winding connected in series and bridging sai-d receiver to prevent actuation thereof by currents generated in said primary winding, a local source of direct current, and means controlled by said coil to cause pulsating current from said source to be generated in said primary winding.
  • an induction coil having a primary and two secondary windings, a receiver and one of said secondary windings connected in series across said line, a resistor and the other secondary winding connected in series and bridging said receiver to prevent actuation thereof by currents generated in said primary winding, a local source of direct current, and means cooperating with said primary winding and said source to operate as a buzzer, thereby to transmit a signal over said line.
  • an induction coil having a primary and two secondary windings, a receiver and one of said secondary windings connected in series across said line, a resistor and the other secondary winding connected in series and bridging saidreceiver to prevent actuation thereof by currents generated in said primary winding, a local source of direct current, a microphone,- a contact controlled by said primary winding, means for connecting either said microphone or said contact in a series circuit'including said source and said primary winding, said microphone when connected responding to sounds to generate undulating waves in said primary winding for transmission over said line, and said contact when connected cooperating with said primary winding to cause said primary winding to be traversed by current impulses from said source.
  • an induction coil a source of direct current
  • an induction coil a line connected thereto, a source of direct current, means including said source for at times impress ing an undulating current upon one of the Windings of said coil thereby to induce a corresponding current in said line, and means operated magnetically by said coil at times to cause current from said source to flow pulsatingly through said one winding thereby to induce an alternating current in said line.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
US244785A 1937-12-11 1938-12-09 Signaling circuit Expired - Lifetime US2250769A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH2250769X 1937-12-11

Publications (1)

Publication Number Publication Date
US2250769A true US2250769A (en) 1941-07-29

Family

ID=4568218

Family Applications (1)

Application Number Title Priority Date Filing Date
US244785A Expired - Lifetime US2250769A (en) 1937-12-11 1938-12-09 Signaling circuit

Country Status (2)

Country Link
US (1) US2250769A (en(2012))
NL (1) NL56358C (en(2012))

Also Published As

Publication number Publication date
NL56358C (en(2012))

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