GB456270A - Improvements in or relating to modulated carrier wave communication systems - Google Patents

Improvements in or relating to modulated carrier wave communication systems

Info

Publication number
GB456270A
GB456270A GB11004/36A GB1100436A GB456270A GB 456270 A GB456270 A GB 456270A GB 11004/36 A GB11004/36 A GB 11004/36A GB 1100436 A GB1100436 A GB 1100436A GB 456270 A GB456270 A GB 456270A
Authority
GB
United Kingdom
Prior art keywords
pair
pairs
channels
frequency
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
GB11004/36A
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.)
JAN MAURITS DOUWES DEKKER
Original Assignee
JAN MAURITS DOUWES DEKKER
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 JAN MAURITS DOUWES DEKKER filed Critical JAN MAURITS DOUWES DEKKER
Publication of GB456270A publication Critical patent/GB456270A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements
    • H04J1/045—Filters applied to frequency transposition

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Radio Relay Systems (AREA)

Abstract

456,270. Multiplex systems. DEKKER, J. M. D., 11, Kortenaerkade, The Hague.-(Assignee of The Netherlands, King- dom of) April 16, 1936, No. 11004. Convention date, April 30, 1935. [Class 40 (iv)] In a multi-channel carrier transmission system, particularly over land line or cable, channels are grouped in pairs, as shown in Fig. 2, using the upper side band for the lower frequency channel of a pair and the lower side band for the upper frequency channel, the channels of a pair being arranged so that the upper modulation frequencies are adjacent and a single band-pass filter may be used. This, whilst providing substantially the same number of channels over a given frequency range as the system with equal spacing shown in Fig. 1, permits wider spacing and reduces the number of filters. At the receiving end, Fig. 3, the pairs are separated by band-pass filters 4 and the two channels of a pair are separated by supplying the original carriers separately to demodulators 7, 8 associated with low-frequency filters 9, 10. In a modification involving two stages of modulation, the pairs are formed by using two auxiliary carriers of the same frequency for each pair, the pairs being spaced along the transmission bend by main carriers having a different frequency for each pair. The band corresponding to any pair may be used for transmitting music.
GB11004/36A 1935-04-30 1936-04-16 Improvements in or relating to modulated carrier wave communication systems Expired GB456270A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL456270X 1935-04-30
DES0123063 1936-06-18

Publications (1)

Publication Number Publication Date
GB456270A true GB456270A (en) 1936-11-05

Family

ID=25998937

Family Applications (2)

Application Number Title Priority Date Filing Date
GB11004/36A Expired GB456270A (en) 1935-04-30 1936-04-16 Improvements in or relating to modulated carrier wave communication systems
GB16756/37A Expired GB474021A (en) 1935-04-30 1937-06-16 Improvements in or relating to multi-channel signal transmission systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB16756/37A Expired GB474021A (en) 1935-04-30 1937-06-16 Improvements in or relating to multi-channel signal transmission systems

Country Status (6)

Country Link
US (1) US2156278A (en)
BE (1) BE415104A (en)
DE (1) DE699830C (en)
FR (2) FR810818A (en)
GB (2) GB456270A (en)
NL (1) NL42529C (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE928110C (en) * 1943-02-12 1955-05-23 Aeg Four-wire carrier frequency transmission system
US2479701A (en) * 1944-02-07 1949-08-23 William C De Vry Transmitting system
BE459652A (en) * 1944-05-08 1945-09-29
GB615922A (en) * 1945-05-02 1949-01-13 Philips Nv Improvements in multiplex carrier-wave telephony
US2621325A (en) * 1946-08-20 1952-12-09 Radio Electr Soc Fr Plural modulation multiplex system
US2574326A (en) * 1947-12-02 1951-11-06 Rca Corp Generating groups of currents
US7447436B2 (en) * 1999-12-29 2008-11-04 Forster Energy Llc Optical communications using multiplexed single sideband transmission and heterodyne detection

Also Published As

Publication number Publication date
FR810818A (en) 1937-03-31
DE699830C (en) 1940-12-07
BE415104A (en)
FR823061A (en) 1938-01-13
NL42529C (en)
GB474021A (en) 1937-10-25
US2156278A (en) 1939-05-02

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