ZA974783B - Digital communications. - Google Patents

Digital communications.

Info

Publication number
ZA974783B
ZA974783B ZA9704783A ZA974783A ZA974783B ZA 974783 B ZA974783 B ZA 974783B ZA 9704783 A ZA9704783 A ZA 9704783A ZA 974783 A ZA974783 A ZA 974783A ZA 974783 B ZA974783 B ZA 974783B
Authority
ZA
South Africa
Prior art keywords
digital communications
communications
digital
Prior art date
Application number
ZA9704783A
Other languages
English (en)
Inventor
Clive Russel Irving
David John Spreadbury
Colin Richard Smithers
Timothy Charles Mace
Original Assignee
Tracker Network Uk Ltd
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 Tracker Network Uk Ltd filed Critical Tracker Network Uk Ltd
Publication of ZA974783B publication Critical patent/ZA974783B/xx

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • G01S1/04—Details
    • G01S1/045—Receivers
    • 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/3827—Portable transceivers
ZA9704783A 1996-05-31 1997-05-30 Digital communications. ZA974783B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9611425.1A GB9611425D0 (en) 1996-05-31 1996-05-31 Digital communications

Publications (1)

Publication Number Publication Date
ZA974783B true ZA974783B (en) 1997-12-30

Family

ID=10794597

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA9704783A ZA974783B (en) 1996-05-31 1997-05-30 Digital communications.

Country Status (12)

Country Link
US (1) US6522698B1 (xx)
EP (1) EP0903015B1 (xx)
AU (1) AU2968397A (xx)
CZ (1) CZ294978B6 (xx)
DE (1) DE69732356T2 (xx)
ES (1) ES2237796T3 (xx)
GB (1) GB9611425D0 (xx)
PL (1) PL184100B1 (xx)
RU (1) RU2214049C2 (xx)
SK (1) SK286571B6 (xx)
WO (1) WO1997045962A1 (xx)
ZA (1) ZA974783B (xx)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9612195D0 (en) * 1996-06-11 1996-08-14 Plextek Ltd Communication system
JP2004522198A (ja) * 2001-05-08 2004-07-22 コーニンクレッカ　フィリップス　エレクトロニクス　エヌ　ヴィ 音声符号化方法
US7536169B2 (en) 2002-05-17 2009-05-19 Lojack Operating Company Lp Method of and apparatus for utilizing geographically spread cellular radio networks to supplement more geographically limited stolen vehicle recovery radio networks in activation of radio tracking and recovery of such vehicles
US20050152279A1 (en) * 2004-01-13 2005-07-14 Robertson Brett L. Downlink power control in wireless communications networks and methods
CN100565422C (zh) * 2004-01-29 2009-12-02 Nxp股份有限公司 可编程且可中止的时钟发生单元
US7561102B2 (en) * 2004-07-08 2009-07-14 Lojack Operating Company, Lp Method of and system for expanding localized missing customer-vehicle law enforcement-aided VHF recovery networks with location-on-demand supplemental service features via such networks for improved law enforcement-aided recovery, and via the internet for providing supplemental customer service features
US7511606B2 (en) 2005-05-18 2009-03-31 Lojack Operating Company Lp Vehicle locating unit with input voltage protection
US7593711B2 (en) * 2005-05-18 2009-09-22 Lojack Operating Company, Lp Vehicle locating unit with improved power management method
US20060261981A1 (en) * 2005-05-18 2006-11-23 Frank Romano Vehicle locating unit proof of life subsystem and method
US20070040668A1 (en) * 2005-08-18 2007-02-22 Sampath Krishna Recovery system with a more reliable network
US8787823B2 (en) * 2005-09-19 2014-07-22 Lojack Corporation Recovery system with repeating communication capabilities
US7664462B2 (en) 2005-09-19 2010-02-16 Lojack Operating Company Lp Recovery system with De-queue logic
GB2444308B (en) 2006-12-01 2011-11-16 Plextek Ltd Narrow band transceiver
US8149142B2 (en) 2007-03-12 2012-04-03 Lojack Operating Company, L.P. Adaptive range vehicle locating unit, vehicle tracking unit and vehicle recovery system including same
PL2245606T3 (pl) 2008-02-14 2015-08-31 Lojack Corp System odzysku obiektów wartościowych
EP2255448A4 (en) * 2008-02-25 2012-05-30 Recovery Systems Holdings Llc VEHICLE SAFETY AND MONITORING SYSTEM
WO2009108150A1 (en) * 2008-02-28 2009-09-03 Volvo Group North America, Inc. Gps filter algorithm
AU2009229803B9 (en) * 2008-03-28 2014-02-27 Ntt Docomo, Inc. Mobile station, base station, basic frequency block specifying method and band control method
JP5224869B2 (ja) * 2008-03-28 2013-07-03 株式会社エヌ・ティ・ティ・ドコモ 移動通信システムで使用される基地局装置、ユーザ装置及び方法
US8169328B2 (en) * 2009-06-09 2012-05-01 Lojack Operating Company, Lp Proximity monitoring and locating system
JP5446671B2 (ja) * 2009-09-29 2014-03-19 ソニー株式会社 無線伝送システム及び無線通信方法
US8618957B2 (en) * 2009-10-23 2013-12-31 Lojack Corporation Power management system and method for vehicle locating unit
US8630605B2 (en) * 2009-10-23 2014-01-14 Lojack Corporation Synchronization system and method for achieving low power battery operation of a vehicle locating unit in a stolen vehicle recovery system which receives periodic transmissions
US10243766B2 (en) 2017-07-05 2019-03-26 Lojack Corporation Systems and methods for determining and compensating for offsets in RF communications
US10461868B2 (en) 2017-07-05 2019-10-29 Calamp Wireless Networks Corporation Systems and methods for reducing undesirable behaviors in RF communications
US10367457B2 (en) 2017-07-06 2019-07-30 Calamp Wireless Networks Corporation Single stage ramped power amplifiers

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215934A (en) * 1960-10-21 1965-11-02 Sylvania Electric Prod System for quantizing intelligence according to ratio of outputs of adjacent band-pass filters
US4301454A (en) * 1979-11-30 1981-11-17 Bunker Ramo Corporation Channelized receiver system
US4818998A (en) * 1986-03-31 1989-04-04 Lo-Jack Corporation Method of and system and apparatus for locating and/or tracking stolen or missing vehicles and the like
FR2670062B1 (fr) * 1990-11-30 1993-11-12 Thomson Csf Procede de recalage des oscillateurs locaux d'un recepteur et dispositif pour la mise en óoeuvre du procede.
US5367539A (en) 1991-12-31 1994-11-22 At&T Bell Laboratories Digital block processor for processing a plurality of transmission channels in a wireless radiotelephony system
FR2691813B1 (fr) * 1992-05-26 1997-12-19 Thomson Csf Systeme pour l'identification et la detection automatique de vehicules ou d'objets.
IL104264A (en) * 1992-08-20 1996-07-23 Nexus Telecomm Syst Remote location determination system
DE4425713C1 (de) * 1994-07-20 1995-04-20 Inst Rundfunktechnik Gmbh Verfahren zur Vielträger Modulation und Demodulation von digital codierten Daten
US6111911A (en) * 1995-06-07 2000-08-29 Sanconix, Inc Direct sequence frequency ambiguity resolving receiver
US6178197B1 (en) * 1997-06-23 2001-01-23 Cellnet Data Systems, Inc. Frequency discrimination in a spread spectrum signal processing system

Also Published As

Publication number Publication date
CZ374098A3 (cs) 1999-08-11
GB9611425D0 (en) 1996-08-07
EP0903015A1 (en) 1999-03-24
PL330143A1 (en) 1999-04-26
PL184100B1 (pl) 2002-08-30
SK286571B6 (sk) 2009-01-07
CZ294978B6 (cs) 2005-04-13
WO1997045962A1 (en) 1997-12-04
RU2214049C2 (ru) 2003-10-10
US6522698B1 (en) 2003-02-18
DE69732356T2 (de) 2006-01-05
SK164498A3 (en) 1999-06-11
AU2968397A (en) 1998-01-05
ES2237796T3 (es) 2005-08-01
DE69732356D1 (de) 2005-03-03
EP0903015B1 (en) 2005-01-26

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