GB236654A - Improvements in or relating to multiplex telegraphy and radio-telegraphy - Google Patents

Improvements in or relating to multiplex telegraphy and radio-telegraphy

Info

Publication number
GB236654A
GB236654A GB26032/23A GB2603223A GB236654A GB 236654 A GB236654 A GB 236654A GB 26032/23 A GB26032/23 A GB 26032/23A GB 2603223 A GB2603223 A GB 2603223A GB 236654 A GB236654 A GB 236654A
Authority
GB
United Kingdom
Prior art keywords
telegraphy
frequencies
multiplex
marrec
employed
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
GB26032/23A
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.)
MARREC Ltd
Original Assignee
MARREC Ltd
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 MARREC Ltd filed Critical MARREC Ltd
Priority to GB26032/23A priority Critical patent/GB236654A/en
Priority to US20069A priority patent/US1675038A/en
Priority to FR596620D priority patent/FR596620A/en
Publication of GB236654A publication Critical patent/GB236654A/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)
  • Transmitters (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)

Abstract

236,654. Marrec, Ltd., and Marrec, Y. April 14, 1924. Drawings to Specification. Multiplex signalling.-Relates to multiplex harmonic systems of telegraphy, and consists in allotting two closely-adjacent frequencies to each channel of communication, one for signals and the other for spaces. By this means, any beat notes arising from interference between the channels are rendered continuous and only slightly variable in pitch, thus interfering to a minimum extent with the reading of the desired signals. None of the frequencies employed should be the same as any of the beat or difference frequencies. Reception is preferably effected by apparatus of the type described in Specification 203,678. sharply selective to the signal frequency. When inaudible frequencies are employed for transmission, they may be received by the heterodyne method. For wireless transmission. the complex signal current is used to modulate one or more carrier waves.
GB26032/23A 1924-04-14 1924-04-14 Improvements in or relating to multiplex telegraphy and radio-telegraphy Expired GB236654A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB26032/23A GB236654A (en) 1924-04-14 1924-04-14 Improvements in or relating to multiplex telegraphy and radio-telegraphy
US20069A US1675038A (en) 1924-04-14 1925-04-02 Telegraphy and radiotelegraphy
FR596620D FR596620A (en) 1924-04-14 1925-04-14 Improvements in telegraphy and radio-telegraphy systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26032/23A GB236654A (en) 1924-04-14 1924-04-14 Improvements in or relating to multiplex telegraphy and radio-telegraphy

Publications (1)

Publication Number Publication Date
GB236654A true GB236654A (en) 1925-07-14

Family

ID=10237271

Family Applications (1)

Application Number Title Priority Date Filing Date
GB26032/23A Expired GB236654A (en) 1924-04-14 1924-04-14 Improvements in or relating to multiplex telegraphy and radio-telegraphy

Country Status (3)

Country Link
US (1) US1675038A (en)
FR (1) FR596620A (en)
GB (1) GB236654A (en)

Also Published As

Publication number Publication date
US1675038A (en) 1928-06-26
FR596620A (en) 1925-10-28

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