GB583626A - Improvements in frequency modulation networks - Google Patents

Improvements in frequency modulation networks

Info

Publication number
GB583626A
GB583626A GB22060/44A GB2206044A GB583626A GB 583626 A GB583626 A GB 583626A GB 22060/44 A GB22060/44 A GB 22060/44A GB 2206044 A GB2206044 A GB 2206044A GB 583626 A GB583626 A GB 583626A
Authority
GB
United Kingdom
Prior art keywords
frequency
nov
modulated
frequency modulation
modulation
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
GB22060/44A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB583626A publication Critical patent/GB583626A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/18—Arrangements for synchronising broadcast or distribution via plural systems
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station

Landscapes

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

Abstract

583,626. Frequency modulation. PHILIPS LAMPS, Ltd. Nov. 9, 1944, No. 22060. Convention date, Nov. 9, 1943. Drawings to Specification. [Class 40 (y)] The frequency modulated transmitters of a network have different mean carrier frequencies but overlapping frequency deviation ranges and are modulated co-phasally with the same signal. The carrier frequency separation is at least twice the highest transmitted modulation frequency and the receivers, which may be tuned to any one transmitter, are of the type described in Specification 8584/44 (as open to inspection under Sect. 91), in which a feedback circuit reduces the frequency deviation range and a narrow band I.F. amplifier is used. Specification 599,907, [Group XXXV], also is referred to.
GB22060/44A 1943-11-09 1944-11-09 Improvements in frequency modulation networks Expired GB583626A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US509600A US2429504A (en) 1943-11-09 1943-11-09 Frequency modulation network

Publications (1)

Publication Number Publication Date
GB583626A true GB583626A (en) 1946-12-23

Family

ID=24027343

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22060/44A Expired GB583626A (en) 1943-11-09 1944-11-09 Improvements in frequency modulation networks

Country Status (3)

Country Link
US (1) US2429504A (en)
FR (1) FR957647A (en)
GB (1) GB583626A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2549423A (en) * 1943-09-22 1951-04-17 Rca Corp Reduction of selective fading distortion
US2545511A (en) * 1945-05-02 1951-03-20 Brinkley John Raymond Radio communication system
US2579882A (en) * 1947-06-05 1951-12-25 Rca Corp Interference suppression in radio signaling systems
BE486057A (en) * 1947-11-28
US2572235A (en) * 1948-03-30 1951-10-23 Bell Telephone Labor Inc Multichannel intermodulation interference reduction radio communication system
DE1111681B (en) * 1952-12-02 1961-07-27 Rundfunk Betr Stechnik G M B H Wireless messaging system with multiple occupancy of VHF-FM frequency channels
DE1230471B (en) * 1956-02-02 1966-12-15 Siemens Ag FM communication system using equally modulated transmitters that use carrier frequencies in the same radio channel
DE1240954B (en) * 1957-03-07 1967-05-24 Siemens Ag Radio transmission and reception system with frequency-modulated transmitters of the same modulation for area coverage
JPS52141113A (en) * 1976-05-19 1977-11-25 Nippon Telegr & Teleph Corp <Ntt> Transmission diversity system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1751516A (en) * 1927-08-08 1930-03-25 American Telephone & Telegraph Common-frequency broadcasting system
US2127015A (en) * 1934-04-13 1938-08-16 American Optical Corp Electromagnetic wave signaling system
US2230231A (en) * 1936-10-24 1941-02-04 Rca Corp Phase and frequency modulation
US2270899A (en) * 1938-11-12 1942-01-27 Gen Electric Frequency modulation system
US2357975A (en) * 1942-03-16 1944-09-12 Rca Corp Frequency modulation system

Also Published As

Publication number Publication date
US2429504A (en) 1947-10-21
FR957647A (en) 1950-02-23

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