CH213513A - Circuit arrangement for telecommunications systems in which signals are given by means of alternating currents of a certain frequency. - Google Patents

Circuit arrangement for telecommunications systems in which signals are given by means of alternating currents of a certain frequency.

Info

Publication number
CH213513A
CH213513A CH213513DA CH213513A CH 213513 A CH213513 A CH 213513A CH 213513D A CH213513D A CH 213513DA CH 213513 A CH213513 A CH 213513A
Authority
CH
Switzerland
Prior art keywords
signals
given
circuit arrangement
certain frequency
alternating currents
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft C Lorenz
Original Assignee
Lorenz C 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 Lorenz C Ag filed Critical Lorenz C Ag
Publication of CH213513A publication Critical patent/CH213513A/en

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
CH213513D 1938-07-30 1939-07-26 Circuit arrangement for telecommunications systems in which signals are given by means of alternating currents of a certain frequency. CH213513A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL95305A DE761755C (en) 1938-07-30 1938-07-30 Circuit arrangement for telecommunications systems, in which signals are given by alternating currents of a certain frequency

Publications (1)

Publication Number Publication Date
CH213513A true CH213513A (en) 1941-02-15

Family

ID=27797494

Family Applications (1)

Application Number Title Priority Date Filing Date
CH213513D CH213513A (en) 1938-07-30 1939-07-26 Circuit arrangement for telecommunications systems in which signals are given by means of alternating currents of a certain frequency.

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) NL56981C (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE428639C (en) * 1926-05-20 Siemens & Halske Akt Ges Electric call device for telecommunication lines
DE377922C (en) * 1921-02-22 1923-06-29 Western Electric Co Ltd Circuit arrangement for signal transmission

Also Published As

Publication number Publication date
FR858471A (en) 1940-11-26
US2238263A (en) 1941-04-15
BE435700A (en)
DE761755C (en) 1953-11-02
NL56981C (en)
NL55006C (en)

Similar Documents

Publication Publication Date Title
CH210435A (en) Multiple telephone system.
CH214060A (en) Oscillation circuit for short electromagnetic waves.
CH260212A (en) Loop antenna.
CH212535A (en) Circuit arrangement for telecommunications systems in which signals are given by means of alternating currents of a certain frequency.
CH213513A (en) Circuit arrangement for telecommunications systems in which signals are given by means of alternating currents of a certain frequency.
CH208247A (en) DC-biased choke coil for three-phase current.
CH205684A (en) Circuit arrangement in a carrier frequency system.
CH217893A (en) Dual carrier frequency system.
CH209383A (en) Adding machine for making lists.
CH216275A (en) Circuit for ultra-high frequency oscillations.
CH235396A (en) Carrier frequency system.
CH275994A (en) Frequency change circuit.
CH211391A (en) Superposition receiving circuit.
CH213670A (en) AC magnets, in particular for electroacoustic devices.
CH216072A (en) Carrier frequency system with multiple modulation.
CH232473A (en) Overlay receiver for frequency modulation.
CH206314A (en) Carrier wave telephony system.
CH205040A (en) High frequency cables.
CH214051A (en) Carrier frequency transmission system.
CH210928A (en) Circuit device for carrier-frequency communication.
CH208095A (en) Multi-carrier frequency signaling system.
CH264651A (en) Phase shift network, especially for radio guidance systems.
DK59272C (en) Remote messaging system in which Signals are transmitted by Alternating currents of Speech frequency that alternate with each other.
CH216838A (en) Carrier frequency two-wire system.
DK60137C (en) Submarine High Frequency Cable.