GB481527A - Improvements in or relating to multiplex radio signalling systems - Google Patents

Improvements in or relating to multiplex radio signalling systems

Info

Publication number
GB481527A
GB481527A GB24941/36A GB2494136A GB481527A GB 481527 A GB481527 A GB 481527A GB 24941/36 A GB24941/36 A GB 24941/36A GB 2494136 A GB2494136 A GB 2494136A GB 481527 A GB481527 A GB 481527A
Authority
GB
United Kingdom
Prior art keywords
frequency
channels
systems
carrier
relating
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
GB24941/36A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB481527A publication Critical patent/GB481527A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/20—Frequency-division multiplex systems in which at least one carrier is angle-modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/006—Angle modulation

Abstract

481,527. Multiplex wireless signalling. ARMSTRONG, E. H. Sept. 12, 1936, No. 24941. Convention date, Sept. 14, 1935. Drawings to Specification. [Class 40 (v)] Relates to multiplex systems in which a single carrier frequency is frequency-modulated by a plurality of channels confined to non- overlapping frequency bands. In one system, one of the channels directly modulates the carrier while the others amplitude-modulate sub-carriers which then frequency-modulate the main carrier. In another system the subcarriers themselves are frequency-modulated by the channels allotted to them before frequency-modulation of the main carrier. At the receiver the channels are separated by filters after the first frequency-demodulation. Complete circuits are described for the above systems being based on the frequency modulation and demodulation systems described in Specifications 426,227 and 426,228.
GB24941/36A 1935-09-14 1936-09-12 Improvements in or relating to multiplex radio signalling systems Expired GB481527A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US40548A US2104012A (en) 1935-09-14 1935-09-14 Multiplex radio signaling system

Publications (1)

Publication Number Publication Date
GB481527A true GB481527A (en) 1938-03-14

Family

ID=21911589

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24941/36A Expired GB481527A (en) 1935-09-14 1936-09-12 Improvements in or relating to multiplex radio signalling systems

Country Status (4)

Country Link
US (1) US2104012A (en)
FR (1) FR811208A (en)
GB (1) GB481527A (en)
NL (1) NL51362C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE480549A (en) * 1938-11-12
US2481516A (en) * 1946-03-22 1949-09-13 Lance R Jacobsen Mobile telephone system
US2621325A (en) * 1946-08-20 1952-12-09 Radio Electr Soc Fr Plural modulation multiplex system
US2546307A (en) * 1947-10-01 1951-03-27 Walter C Johnson Limiter circuit for telemetering systems
US2776429A (en) * 1951-01-27 1957-01-01 Multiplex Dev Corp Multiplex communications system
US3222452A (en) * 1956-07-16 1965-12-07 Jr Thomas A Banning Pre-pay or subscription radio or television operations
US3854094A (en) * 1972-11-01 1974-12-10 Regency Electronics Crystal controlled, frequency modulated transmitter

Also Published As

Publication number Publication date
NL51362C (en)
FR811208A (en) 1937-04-09
US2104012A (en) 1938-01-04

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