SE9702434L - Simultaneous broadcast re-synchronization improvement using global positioning system - Google Patents

Simultaneous broadcast re-synchronization improvement using global positioning system

Info

Publication number
SE9702434L
SE9702434L SE9702434A SE9702434A SE9702434L SE 9702434 L SE9702434 L SE 9702434L SE 9702434 A SE9702434 A SE 9702434A SE 9702434 A SE9702434 A SE 9702434A SE 9702434 L SE9702434 L SE 9702434L
Authority
SE
Sweden
Prior art keywords
site
resynch
data
global positioning
modems
Prior art date
Application number
SE9702434A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE9702434D0 (en
Inventor
Thomas A Brown
Original Assignee
Ericsson Ge Mobile Inc
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 Ericsson Ge Mobile Inc filed Critical Ericsson Ge Mobile Inc
Publication of SE9702434D0 publication Critical patent/SE9702434D0/en
Publication of SE9702434L publication Critical patent/SE9702434L/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/67—Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency

Abstract

In a multiple site radio frequency simulcasting R.F. transmission system, data provided via inter-site communications links (L1, L2, etc.) from a control point to the R.F. transmitter sites exhibits random time delay skew because multi-phase modems recover clock signals from an arbitrary one of multiple phases. The output data streams of the modems are temporarily stored at the sites in memory buffers for temporal alignment for simultaneous R.F. transmission. The memory buffers at each site are periodically resynchronised on a continual basis by a universal "resynch" circuit to maintain optimum simulcast system performance. A 9600 bps data clocking reference and a low frequency data "gating" (timing) signal required for performing a periodic "resynch" operation are derived separately from a common satellite reference signal acquired by using a GPS (global positioning satellite) receiver at each simulcast system site. A resynch operation is periodically performed on a continuing basis separately by each simulcast system site and the distributed multi-site broadcast data stream is aligned using the resynch reference tones derived from the received GPS signal.
SE9702434A 1994-12-27 1997-06-25 Simultaneous broadcast re-synchronization improvement using global positioning system SE9702434L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36446794A 1994-12-27 1994-12-27
PCT/US1995/016847 WO1996020543A1 (en) 1994-12-27 1995-12-22 Simulcast resynchronisation improvement using global positioning system

Publications (2)

Publication Number Publication Date
SE9702434D0 SE9702434D0 (en) 1997-06-25
SE9702434L true SE9702434L (en) 1997-08-08

Family

ID=23434646

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9702434A SE9702434L (en) 1994-12-27 1997-06-25 Simultaneous broadcast re-synchronization improvement using global positioning system

Country Status (5)

Country Link
CN (1) CN1175333A (en)
AU (1) AU4607996A (en)
CA (1) CA2208697A1 (en)
SE (1) SE9702434L (en)
WO (1) WO1996020543A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19633786A1 (en) * 1996-08-22 1998-02-26 Bosch Gmbh Robert Procedure for the synchronization of radio cells in single-wave radio and radio station
GB2388264A (en) * 2002-01-10 2003-11-05 Roke Manor Research GPS based networked time synchronised unit
DE10354468A1 (en) * 2003-11-21 2005-06-23 Rohde & Schwarz Gmbh & Co. Kg Method and device for monitoring the carrier frequency stability of transmitters in a common wave network
CN101179371B (en) * 2006-11-09 2010-04-07 大唐移动通信设备有限公司 Clock phase-locked method to extract synchronous clock of global positioning system and clock phase-locked loop
US8279908B2 (en) * 2008-12-31 2012-10-02 Ibiquity Digital Corporation Synchronization of separated platforms in an HD radio broadcast single frequency network
CN102004622B (en) * 2010-11-17 2012-07-18 广东威创视讯科技股份有限公司 Multiprocessor display system and method
CN102316576B (en) * 2011-09-21 2018-04-17 中兴通讯股份有限公司 A kind of wireless base station clock synchronizing method, system, base band frame and exchange frame
US9585121B2 (en) 2012-01-05 2017-02-28 Motorola Solutions, Inc. Method and apparatus for simulcasting within a communication system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1342892A (en) * 1991-01-28 1992-08-27 Motorola, Inc. Simulcast transmission system having predetermined launch times
GB9111313D0 (en) * 1991-05-24 1991-07-17 British Telecomm Radio system
US5261118A (en) * 1991-10-04 1993-11-09 Motorola, Inc. Simulcast synchronization and equalization system and method therefor
SG46571A1 (en) * 1992-01-10 1998-02-20 Nec Corp Radio paging systems having a plurality of transmitter stations
US5243299A (en) * 1992-01-22 1993-09-07 Glenayre Electronics, Inc. Variable speed asynchronous modem
US5517680A (en) * 1992-01-22 1996-05-14 Ericsson Inc. Self correction of PST simulcast system timing

Also Published As

Publication number Publication date
MX9704630A (en) 1997-09-30
SE9702434D0 (en) 1997-06-25
WO1996020543A1 (en) 1996-07-04
CA2208697A1 (en) 1996-07-04
CN1175333A (en) 1998-03-04
AU4607996A (en) 1996-07-19

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