US2238263A - Intercommunication system - Google Patents

Intercommunication system Download PDF

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Publication number
US2238263A
US2238263A US285863A US28586339A US2238263A US 2238263 A US2238263 A US 2238263A US 285863 A US285863 A US 285863A US 28586339 A US28586339 A US 28586339A US 2238263 A US2238263 A US 2238263A
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US
United States
Prior art keywords
relay
winding
contact
signals
condensers
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
US285863A
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English (en)
Inventor
Helmert Robert
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz 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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2238263A publication Critical patent/US2238263A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks

Definitions

  • This invention relates to intercommunication systems, and more particularly to signaling arrangements in telephone systems in which supervisory signals, such as call signals, disconnect signals and the like, are transmitted by alternating currents of different audio frequencies.
  • the receiving equipment of a telephone or other intercommunication system is provided with a particular auxiliary relay, the one winding of which is adapted to be energized and deenergized by condensers which in response to each movement of the armature of a polarized receiving relay are connected to and disconnected from this winding for rendering the auxiliary relay responsive only to the desirable current frequency.
  • the auxiliary relay possesses a permanently energized second winding, the effect of which becomes nullified in response to the charge or discharge currents from the condensers for restoring the auxiliary relay to normal in response to incoming signals of the desired frequency. It is thus possible by suitably dimensioning the condensers to cause the auxiliary relay to be maintained operated in response to incoming signals of too low frequency by virtue of the magnetization of the permanently energized winding predominant over that of the second winding, and to prevent this relay from finally releasing in response to incoming signals of excessive frequency, that is, to immediately restore this relay to its operated state if it has been transiently released by the last mentioned excessive frequency signals.
  • a particular slow-acting relay is provided the relative position which the armature of the receiving relay mentioned has obtained at the end of incoming alternating signals.
  • This facility involves the beneficial property that a plurality of receiving equipments may be connected to one single communication line. It is thus possible to so adjust the individual receiving apparatus that some thereof may be caused to release a supervisory signal when the armature of the receiving relay is set into one position, while the remaining apparatus may be rendered effective when the armature is set into its opposite position.
  • TI and T2 indicate standard telephone sets having an alternating current ringer and a magneto set.
  • the alternating current relay A becomes energized, thus reverting its contact a with the result that the relay H is energized.
  • the relay H reverts its contact hi and 72.2, thereby establishing at the contact M an energizing circuit for a slowto-release relay V.
  • the contact hf of the operated relay H has applied an alternatin'g current from a generator G3, e. g.
  • the mean energization of the winding I of relay R in response to incoming signals of the desired frequency is equal to the permanent energization of the winding II of this relay so that the relay R is caused to release and to revert its contacts TI and T2.
  • the contact 1'2 thus establishes an obvious circuit for a slow-acting relay D which operates after the elapse of a predetermined interval of time.
  • the relay A releases and disconnects at its contact a the energizing circuit for the relay H which is restored to normal thereby resetting its contacts hi and I12 into the positions illustrated in the drawing.
  • the winding I of the relay S is energized through a resistance W in such a sense that the low frequency generator G2 remains connected up at contact s until the relay V releases with delay and opens its contacts vi and 02.
  • the contact 6 of the receiving relay E remains in the position which corresponds to the rectifier F2 so that the condenser Cl is short-circuited.
  • the winding I of relay R is thus energized from the condenser C2 and thus operated. Since the contact 114 is reverted in response to the operation of the slow-acting relay D the now reverted contact rl establishes an energizing circuit for the relay G.
  • relay F was energized from battery over the contacts d3 and g3 and over the key Lt.
  • the contact 1 of relay F has established a holding circuit for this relay independent of the position of the contact 113.
  • the operation of relay G opens the holding circuit for relay F which releases.
  • the contacts all and d2 of relay D and the contacts gl and 92 of the now energized relay G connects a generator G4 to the receiving station T2 over the line (13, b3 so as to apply alternating call signals thereto until the relay D has released with delay.
  • the contact d3 of this relay establishes an energizing circuit for the relay F, the contact 7 of which establishes a holding circuit as heretofore disclosed.
  • the relay H releases so that its contact hi deenergizes V and its contact 712 becomes restored to the position shown in the drawing. Since the relay U is now operated, the winding II of relay S is so energized through the resistance W and the contacts 712 and a2 that the contact of this relay remains in the position shown in the drawing, that is, toward the generator GI until the relay V again releases with a given delay of time.
  • the armature e of the relay E thus remains in a position which corresponds to the operating condition of the rectifier Fl with the result that the relay R is again caused to deenergize.
  • the relay G cannot be energized so that the relay F remains energized over the contact 93 as mentioned above so that the ringer Q becomes operated until the key Lt is actuated, whereupon the relay F releases.
  • the invention above described is by no means restricted to the embodiment mentioned.
  • the receiving relay E may likewise be controlled by a line over which telegraphic signals are transmitted.
  • the single difference between the telegraphic signals and the signal by which the relay R. as heretofore embodied is influenced consists in the frequency, that is, the frequency generated by the generator G3 must in a telegraph system be higher than the maximum velocity of telegraph operation.
  • an electric communication system employing means for transmitting supervisory signals of different frequencies, supervisory signal equipment for receiving and indicating said signals comprising an auxiliary relay comprising at least one winding, condensers, a relay selectively responsive to supervisory signals of different frequencies for selectively charging said condensers in the same sense through said winding and alternately discharging said condensers dependent upon the frequency of a received supervisory signal, and indicating means controlled by said relays.
  • An electric communication system comprising means for selectively transmitting signals of two different frequencies, and receiving equipment for said signals comprising a first relay having a permanently energized winding and a second winding, a source of voltage connected to said relay, a second relay selectively responsive to said signals, a air of condensers connected to said second winding and controlled by said second relay, said second relay being connected to said condensers so that a signal of one frequency charges one of said condensers through said second winding and discharges the other of said condensers and a signal of another frequency charges the other of said condensers in the same sense through said second winding and discharges the first mentioned condenser, and indicating means under control of said relays comprising means responsive in a predetermined manner to the energization of said relays b a signal of one frequency and responsive in a second predetermined manner to the energization of said relays by a signal of another frequency.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
US285863A 1938-07-30 1939-07-22 Intercommunication system Expired - Lifetime US2238263A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL95305A DE761755C (de) 1938-07-30 1938-07-30 Schaltungsanordnung fuer Fernmeldeanlagen, in denen Signale durch Wechselstroeme einer bestimmten Frequenz gegeben werden

Publications (1)

Publication Number Publication Date
US2238263A true US2238263A (en) 1941-04-15

Family

ID=27797494

Family Applications (1)

Application Number Title Priority Date Filing Date
US285863A Expired - Lifetime US2238263A (en) 1938-07-30 1939-07-22 Intercommunication system

Country Status (6)

Country Link
US (1) US2238263A (en))
BE (1) BE435700A (en))
CH (1) CH213513A (en))
DE (1) DE761755C (en))
FR (1) FR858471A (en))
NL (2) NL55006C (en))

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE428639C (de) * 1926-05-20 Siemens & Halske Akt Ges Elektrische Anrufeinrichtung fuer Fernmeldeleitungen
DE377922C (de) * 1921-02-22 1923-06-29 Western Electric Co Ltd Schaltungsanordnung zur Signaluebermittlung

Also Published As

Publication number Publication date
FR858471A (fr) 1940-11-26
DE761755C (de) 1953-11-02
BE435700A (en))
NL56981C (en))
NL55006C (en))
CH213513A (de) 1941-02-15

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