GB157059A - Improvements in telegraphic systems - Google Patents

Improvements in telegraphic systems

Info

Publication number
GB157059A
GB157059A GB20811/20A GB2081120A GB157059A GB 157059 A GB157059 A GB 157059A GB 20811/20 A GB20811/20 A GB 20811/20A GB 2081120 A GB2081120 A GB 2081120A GB 157059 A GB157059 A GB 157059A
Authority
GB
United Kingdom
Prior art keywords
frequency
currents
low
receiving
excite
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
GB20811/20A
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.)
MAR?S LATOUR
Original Assignee
MAR?S LATOUR
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 MAR?S LATOUR filed Critical MAR?S LATOUR
Publication of GB157059A publication Critical patent/GB157059A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Synchronous Machinery (AREA)

Abstract

157,059. Latour, M. Dec. 18, 1918, [Convention date]. Open to inspection under Sect. 91 Dec. 24, 1920. Void [Published under Sect. 91 of the Act]. Alternating-current systems; harmonic telegraphs; systems with telephonic receiving- arrangements.-In a multiplex telegraph system, a number of messages are simultaneously transmitted by using currents of different low frequencies, preferably below audible frequency, which are stepped up to a higher frequency at the receiving-station to render them audible. The signalling frequencies may be stepped up at the receiving-station (1) by sending the low-frequency currents through the exciting-field of the first of a series of alternating-current generators arranged in cascade, (2) by using the low-frequency currents to excite a compound alternator consisting of a squirrel-cage rotor and two twin stators, or (3) by using the low-frequency currents to excite a simple alternator of musical frequency. The different signalling currents may be separated from one another in known manner.
GB20811/20A 1918-12-18 1920-07-10 Improvements in telegraphic systems Expired GB157059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR157059X 1918-12-18

Publications (1)

Publication Number Publication Date
GB157059A true GB157059A (en) 1921-09-01

Family

ID=8876255

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20811/20A Expired GB157059A (en) 1918-12-18 1920-07-10 Improvements in telegraphic systems

Country Status (1)

Country Link
GB (1) GB157059A (en)

Similar Documents

Publication Publication Date Title
US2817711A (en) Band compression system
GB742977A (en) Improvements in or relating to electric carrier current communication systems
US1907109A (en) Radio signaling system
GB157059A (en) Improvements in telegraphic systems
GB332284A (en) Improvements in electrical transmission systems
US2397885A (en) Frequency diversity telegraph system
US1797284A (en) High-frequency signaling
US3259692A (en) Multi-channel electric wave signalling apparatus
US1333452A (en) Duplex method of and apparatus for sending telegraphic messages
US2390641A (en) Multichannel carrier communication system
US1361486A (en) Composite signaling system
US1526335A (en) Secrecy transmission system
US1588415A (en) Production and transmission of modulated waves
USRE8869E (en) Improvement in electro-harmonic telegraphs
US851621A (en) Wireless signaling system.
US789124A (en) Electrical-wave transmission.
US1617934A (en) Carrier telegraph system
US186340A (en) Improvement in electro-harmonic telegraphs
US1504535A (en) Multiplex transmission channel
US1104256A (en) Apparatus for and method of receiving electric waves.
US1690227A (en) Transmission by modulated waves
US1564224A (en) Modulating apparatus for telegraph signals
US628247A (en) Multiple telephony and telegraphy.
USRE8870E (en) Improvement in electro-harmonic telegraphs
US1356222A (en) Multiple telephony