GB1363451A - System for dispersing energy in a radiotelegraphic communication channel - Google Patents

System for dispersing energy in a radiotelegraphic communication channel

Info

Publication number
GB1363451A
GB1363451A GB3649871A GB3649871A GB1363451A GB 1363451 A GB1363451 A GB 1363451A GB 3649871 A GB3649871 A GB 3649871A GB 3649871 A GB3649871 A GB 3649871A GB 1363451 A GB1363451 A GB 1363451A
Authority
GB
United Kingdom
Prior art keywords
signal
digital
combined
communication channel
combiner
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
GB3649871A
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Publication of GB1363451A publication Critical patent/GB1363451A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4904—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using self-synchronising codes, e.g. split-phase codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying

Abstract

1363451 Telegraphy KOKUSAI DENSHIN DENWA KK 3 Aug 1971 [3 Aug 1970] 36498/71 Heading H4P To reduce peaks in the power spectrum of a digital phase or frequency modulated radio carrier wave, the modulating digital signal is combined with a digital noise signal prior to modulation. An analogue signal is converted in a coder 1, driven by clock source 5, to a digital signal V 1 which is combined in a combiner 2 with a digital noise signal V 2 from generator 3. The resulting signal phase, or frequency, modulates a radio carrier (4). The combiner may be an exclusive OR or NOR circuit. In a receiver the demodulated signal is combined with a locally generated digital noise signal in a similar combining circuit to extract the original digital signal. The arrangement may be used in a radio telegraphic communication channel and a station identification signal UV may be added to each frame.
GB3649871A 1970-08-03 1971-08-03 System for dispersing energy in a radiotelegraphic communication channel Expired GB1363451A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6730370 1970-08-03

Publications (1)

Publication Number Publication Date
GB1363451A true GB1363451A (en) 1974-08-14

Family

ID=13341091

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3649871A Expired GB1363451A (en) 1970-08-03 1971-08-03 System for dispersing energy in a radiotelegraphic communication channel

Country Status (2)

Country Link
CA (1) CA953367A (en)
GB (1) GB1363451A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0174989A1 (en) * 1984-03-20 1986-03-26 Applied Spectrum Technologies, Inc. Data and voice communications system
GB2265068A (en) * 1992-03-11 1993-09-15 Soundcraft Electronics Ltd Digital control of audio analogue systems
US6942706B2 (en) 2002-08-20 2005-09-13 Invista North America S.A.R.L. Vat acid dyeing of textile fibers
GB2461590A (en) * 1982-08-11 2010-01-13 Electronique Serge Dassault Elimination of interference introduced by switching of the respective channels of a pulse radar

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2461590A (en) * 1982-08-11 2010-01-13 Electronique Serge Dassault Elimination of interference introduced by switching of the respective channels of a pulse radar
GB2461590B (en) * 1982-08-11 2010-06-23 Electronique Serge Dassault Process and device for elimination of the effect of clutter signals associated with switching of the receiving channels of a pulse radar
EP0174989A1 (en) * 1984-03-20 1986-03-26 Applied Spectrum Technologies, Inc. Data and voice communications system
EP0174989A4 (en) * 1984-03-20 1988-11-02 Applied Spectrum Tech Data and voice communications system.
GB2265068A (en) * 1992-03-11 1993-09-15 Soundcraft Electronics Ltd Digital control of audio analogue systems
US5454040A (en) * 1992-03-11 1995-09-26 Soundcraft Electronics Limited Digital control of analog systems
GB2265068B (en) * 1992-03-11 1995-10-04 Soundcraft Electronics Ltd Improvements in or relating to the digital control of analogue audio systems
US6942706B2 (en) 2002-08-20 2005-09-13 Invista North America S.A.R.L. Vat acid dyeing of textile fibers

Also Published As

Publication number Publication date
CA953367A (en) 1974-08-20

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee