GB185428A - Method of signalling over telephone conductors fitted with intensifiers with a signal current of high periodicity - Google Patents

Method of signalling over telephone conductors fitted with intensifiers with a signal current of high periodicity

Info

Publication number
GB185428A
GB185428A GB23941/22A GB2394122A GB185428A GB 185428 A GB185428 A GB 185428A GB 23941/22 A GB23941/22 A GB 23941/22A GB 2394122 A GB2394122 A GB 2394122A GB 185428 A GB185428 A GB 185428A
Authority
GB
United Kingdom
Prior art keywords
carrier
low
frequency
signalling
amplifiers
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
Application number
GB23941/22A
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 and Halske AG
Original Assignee
Siemens and Halske 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 and Halske AG filed Critical Siemens and Halske AG
Publication of GB185428A publication Critical patent/GB185428A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

185,428. Siemens & Halske Akt.-Ges. Sept. 5, 1921, [Convention date]. Manual exchange systems; repeating and amplifying systems.-Low-frequency calling or other signalling currents are superposed on a carrier-wave whose frequency lies in the range of speech frequencies, so that when transmitted over a system employing amplifiers which are particularly efficient for speech frequencies, no special modification of the amplifiers is neces. sary. The nodulated carrier-wave is converted back to low-frequency at the receiving station and operates a low-frequency signal receiver. Different carrier or modulating frequencies may be employed for different signalling purposes, for example, for lighting and extinguishing valve amplifiers as the different repeating stations or for calling up a repeating station. The signalling key may be arranged to control the generation of both the carrier-wave and the low-frequency signals.
GB23941/22A 1921-09-05 1922-09-04 Method of signalling over telephone conductors fitted with intensifiers with a signal current of high periodicity Expired GB185428A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE185428X 1921-09-05

Publications (1)

Publication Number Publication Date
GB185428A true GB185428A (en) 1924-01-04

Family

ID=5719444

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23941/22A Expired GB185428A (en) 1921-09-05 1922-09-04 Method of signalling over telephone conductors fitted with intensifiers with a signal current of high periodicity

Country Status (1)

Country Link
GB (1) GB185428A (en)

Similar Documents

Publication Publication Date Title
GB536383A (en) Improvements in frequency modulation systems for radio signalling
GB549948A (en) Carrier frequency telephone system
GB742977A (en) Improvements in or relating to electric carrier current communication systems
GB185428A (en) Method of signalling over telephone conductors fitted with intensifiers with a signal current of high periodicity
US2397885A (en) Frequency diversity telegraph system
GB1499232A (en) Telephone set and system
GB862562A (en) Improvements in or relating to systems for the two-way transmission of intelligence between two stations
GB484287A (en) Improvements in or relating to electric signalling systems
GB501915A (en) Telephone exchange systems
GB492006A (en) Improvements in high frequency signalling systems
GB523067A (en) Improvements in signal receivers for carrier telephony systems
GB335108A (en) Telephone system on pupinised cables, particularly with light loading
GB353629A (en) A transmitting system for simultaneous low frequency and carrier frequency telephony
GB353516A (en) Improvements in systems for communicating with moving vehicles
GB311318A (en) System for the transmission of signals with modulated carrier currents
GB502584A (en) Improvements in or relating to carrier telephony systems
US1761776A (en) Communication system
GB196123A (en) Improvements in or relating to telephone systems
GB226488A (en) Improvements in secret signalling systems
GB154537A (en) Improvements in and relating to the wireless transmission of speech
GB362478A (en) Trunk communicating installation with harmless cross talk
GB299915A (en) Improvements in secret signalling systems
GB613994A (en) Improvements in single side-band, suppressed carrier telecommunication systems
GB604877A (en) Method and means for the transmission of low frequency calls in telecommunication systems
GB403571A (en) Improvements in carrier current signalling systems