US2208928A - Intercommunication system - Google Patents

Intercommunication system Download PDF

Info

Publication number
US2208928A
US2208928A US287198A US28719839A US2208928A US 2208928 A US2208928 A US 2208928A US 287198 A US287198 A US 287198A US 28719839 A US28719839 A US 28719839A US 2208928 A US2208928 A US 2208928A
Authority
US
United States
Prior art keywords
relay
relays
armature
signal
receiving
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
US287198A
Other languages
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 US2208928A publication Critical patent/US2208928A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • 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

Definitions

  • This invention relates to intercommunicacoming frequencies of different kind the relays tlon systems, and more particularly to signaling just mentioned are caused to release when the arrangements in telephone systems in which sucontact or armature of the receiving relay is set pervisory signals, such as call signals, disconnect to the opposite side.
  • the Winding I of relay S receives manner that the charge currents from this conan alternating Current of say 50 Cycles from the denser involves an additional excitation of the generator G3 over the Contact rl and the contwo auxiliary relays mentioned. tact i2.
  • the contact s of relay S is thus caused according to a further aspect of my invention, to vibrate in rhythm With the frequency of the the velocity with which the two frequencies congenerator G3 so as to alternately Switch the stituting a supervisory signal are alternately audio frequency generators GI and G2 in circuit.
  • relay H is short-circuited 'by the contacts a2 and' b2 of the relays A and B, respectively.
  • the relay H reverts its contacts so that the relay D is impulsed over the contact h3.
  • the relay A in the receiving position remains energized due to the energization of the upper winding of the receiving relay E, while the relay B is caused to deenergze.
  • the short-circuit across the relay IHv This indicating lamp may be extinguished by insetting the plug St into ⁇ the jack Kl.
  • the energizing .circuit for the relays N4 and G remains established over the contact g after the release of the relay D.
  • the speech currents cannot cause the relay H of the receiving apparatus to release since it must be considered impossible that the two frequencies to which the devices FI and F2 are tuned will alternately arrive at a frequency of 50 cycles during a time which will suilice to simultaneously energize the two relays A and B and thus to cause the release of the relay H.
  • the relay J releases.
  • the contacts of this relay are restored to normal so that the winding 1I of the relay S now receives an alternating current of 50 cycles from the generator G3.
  • the devices Fl and F2 of the receiving apparatus are thus alternately rendered effective in response to the alternate effectiveness of the audio frequency generators Gi and G11 of the transmitting station when the contact s of relay S oscillatesin rhythm with the 50-cyc1e alternating current from generator G3.
  • the relay N releases so that the indicating lamp SL announcing the disconnect signal is lighted.
  • the single dinerence between the telegraph sianal and the signal which is intended to control the action of the relay H is that the frequency transmitted by the generator G3 of the transmitting station is higher than the maximum speed of telegraph signal transmission.
  • the condenser C3 and the relays A and B are so dimensioned that the relays A and B release during the interruptions or spaces between two -signals and during signal, respectively.
  • the generator G3 of the transmitting apparatus can transmit a frequency which corresponds to the speed of telegraphic signals provided that the telegraph transmission yis so arranged that at given time intervals, e. g. at the end of each character a longer pause is inserted between the telegraph signals and provided that the release time of the relay H is so dimensioned that it is longer than the total time of a signal transmitted between two such pauses.
  • supervisory Signal receiving equipment which is adapted to indicate supervisory signals composed of alternating currents of diiferent frequencies transmitted with a given relation to each other and which comprises a polarized receiving relay adapted to move its armature in response to alternating currents of different frequencies constituting the said supervisory signals, two auxiliary relays adapted to be alternately energized in response to the instantaneous position of the said armature, and a third auxiliary relay for releasing supervisory Signals in response to the simultaneous energization of the said two auxiliary relays.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
US287198A 1938-08-03 1939-07-29 Intercommunication system Expired - Lifetime US2208928A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL95329A DE707378C (de) 1938-08-03 1938-08-03 Schaltungsanordnung fuer Fernmedeanlagen, bei denen die Signale durch Wechselstroeme einer bestimmten Frequenzfolge gegeben werden

Publications (1)

Publication Number Publication Date
US2208928A true US2208928A (en) 1940-07-23

Family

ID=27797495

Family Applications (1)

Application Number Title Priority Date Filing Date
US287198A Expired - Lifetime US2208928A (en) 1938-08-03 1939-07-29 Intercommunication system

Country Status (6)

Country Link
US (1) US2208928A (en))
BE (1) BE435741A (en))
CH (1) CH212535A (en))
DE (1) DE707378C (en))
FR (1) FR858526A (en))
NL (1) NL56885C (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5528682A (en) * 1995-01-30 1996-06-18 Harris Corporation Double duty capacitor circuit and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960737C (de) * 1951-02-24 1957-04-18 Siemens Ag Schaltungsanordnung fuer Fernsprechanlagen, in denen zur Signalgabe Wechselstroeme innerhalb des Sprachbandes benutzt werden

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5528682A (en) * 1995-01-30 1996-06-18 Harris Corporation Double duty capacitor circuit and method

Also Published As

Publication number Publication date
CH212535A (de) 1940-11-30
FR858526A (fr) 1940-11-27
NL56885C (en))
BE435741A (en))
DE707378C (de) 1941-06-20

Similar Documents

Publication Publication Date Title
US2208928A (en) Intercommunication system
US1726947A (en) Distant control device for use over telephone lines
US2218659A (en) Impulse repeater
US2258650A (en) Signaling system and apparatus
US1923718A (en) Signal system
US2040691A (en) Selective code receiver
US1103288A (en) Selective signaling system.
US2500287A (en) Dial speed tester with tone indication
US2176963A (en) Single line telegraph repeater
US955056A (en) Combined telephone and fire-alarm or kindred service system.
US1772587A (en) Telephone system
US2399961A (en) Operating phonograph over communication circuits
US2272786A (en) Apparatus for communication systems
US1121356A (en) Telephone system.
US1282965A (en) Telephone system.
US2454775A (en) Electric alarm signaling system
US1862608A (en) Arrangement for producing modulated currents
US1828823A (en) Combined telephone and telegraph system
US1708934A (en) Electric signaling
US704127A (en) Combined district telegraph and telephone signal.
US1612147A (en) Signaling system
US2238263A (en) Intercommunication system
US719999A (en) Signaling apparatus and system.
US3349185A (en) Ringing curent converting circuit
US245494A (en) eewett