GB752628A - Noise reduction in phase shift carrier ware modulation systems - Google Patents

Noise reduction in phase shift carrier ware modulation systems

Info

Publication number
GB752628A
GB752628A GB29062/54A GB2906254A GB752628A GB 752628 A GB752628 A GB 752628A GB 29062/54 A GB29062/54 A GB 29062/54A GB 2906254 A GB2906254 A GB 2906254A GB 752628 A GB752628 A GB 752628A
Authority
GB
United Kingdom
Prior art keywords
phase shift
noise reduction
modulation systems
oct
band
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
GB29062/54A
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.)
JOHN HENRY BOSE
Original Assignee
JOHN HENRY BOSE
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 JOHN HENRY BOSE filed Critical JOHN HENRY BOSE
Publication of GB752628A publication Critical patent/GB752628A/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

Landscapes

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

Abstract

752,628. Frequency modulation. BOSE, J. H. Oct. 8, 1954 [Oct. 12, 1953], No. 29062/54. Drawings to Specification. Class 40 (5). Relates to frequency modulation transmitters in which a phase shift modulator is followed by a frequency multiplier and a band-pass filter. In such an arrangement the effect of random phase shifts in the early stages, which introduce noise, is reduced by using a band-pass filter which attenuates desired high side frequencies, a compensating network being provided in the modulation input circuit. The invention is described as applied to a multiplex system in which further channels are added by subsequent modulations of the modulated carrier by modulated sub-carriers. Specifications 668,030 and 670,967 are referred to.
GB29062/54A 1953-10-12 1954-10-08 Noise reduction in phase shift carrier ware modulation systems Expired GB752628A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US752628XA 1953-10-12 1953-10-12

Publications (1)

Publication Number Publication Date
GB752628A true GB752628A (en) 1956-07-11

Family

ID=22124563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29062/54A Expired GB752628A (en) 1953-10-12 1954-10-08 Noise reduction in phase shift carrier ware modulation systems

Country Status (3)

Country Link
BE (1) BE532477A (en)
FR (1) FR1113388A (en)
GB (1) GB752628A (en)

Also Published As

Publication number Publication date
BE532477A (en)
FR1113388A (en) 1956-03-28

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