MX9704630A - Simulcast resynchronisation improvement using global positioning system. - Google Patents

Simulcast resynchronisation improvement using global positioning system.

Info

Publication number
MX9704630A
MX9704630A MX9704630A MX9704630A MX9704630A MX 9704630 A MX9704630 A MX 9704630A MX 9704630 A MX9704630 A MX 9704630A MX 9704630 A MX9704630 A MX 9704630A MX 9704630 A MX9704630 A MX 9704630A
Authority
MX
Mexico
Prior art keywords
site
resynch
simulcast
data
global positioning
Prior art date
Application number
MX9704630A
Other languages
Spanish (es)
Other versions
MXPA97004630A (en
Inventor
Thomas A Brown
Original Assignee
Ericsson 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 Inc filed Critical Ericsson Inc
Publication of MX9704630A publication Critical patent/MX9704630A/en
Publication of MXPA97004630A publication Critical patent/MXPA97004630A/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.
MXPA/A/1997/004630A 1994-12-27 1997-06-20 Improvement of resincronisation of simultaneous broadcasting, using the gloft placement system MXPA97004630A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US36446794A 1994-12-27 1994-12-27
US364467 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
MX9704630A true MX9704630A (en) 1997-09-30
MXPA97004630A MXPA97004630A (en) 1998-07-03

Family

ID=

Also Published As

Publication number Publication date
SE9702434D0 (en) 1997-06-25
SE9702434L (en) 1997-08-08
WO1996020543A1 (en) 1996-07-04
CA2208697A1 (en) 1996-07-04
CN1175333A (en) 1998-03-04
AU4607996A (en) 1996-07-19

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