CA2438138A1 - Digital signal transmitter synchronization system - Google Patents

Digital signal transmitter synchronization system Download PDF

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Publication number
CA2438138A1
CA2438138A1 CA002438138A CA2438138A CA2438138A1 CA 2438138 A1 CA2438138 A1 CA 2438138A1 CA 002438138 A CA002438138 A CA 002438138A CA 2438138 A CA2438138 A CA 2438138A CA 2438138 A1 CA2438138 A1 CA 2438138A1
Authority
CA
Canada
Prior art keywords
transmitters
receivers
signal
region
digital
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.)
Granted
Application number
CA002438138A
Other languages
French (fr)
Other versions
CA2438138C (en
Inventor
S. Merrill Weiss
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2438138A1 publication Critical patent/CA2438138A1/en
Application granted granted Critical
Publication of CA2438138C publication Critical patent/CA2438138C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/615—Signal processing at physical level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/015—High-definition television systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards

Abstract

Methods for synchronizing a plurality of RF transmitters (20) that are supplied with a common digital information signal for carrier modulation and subsequent transmission a common channel throughout a prescribed region, whereby digital signal receivers within the region receive transmissions on the channel from more than one transmitter (20). The method involves inserting reference signals into the data sent to transmitters in order to place them into known states at specific times relative to the digital signals sent to them for transmission. The digital signals transmitted by each transmitters will be identical to one another so that the receivers are identical to one another so that the receivers can identify one received signal as a main signal and the others as echoes. The signal transmitted by at least one of synchronized transmitters is delayed, such that identical digital signals received from at least two of the transmitters by receivers in the region arrive at each receiver within a prescribed time window.
CA002438138A 2001-03-30 2002-03-29 Digital signal transmitter synchronization system Expired - Lifetime CA2438138C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US28036401P 2001-03-30 2001-03-30
US60/280,364 2001-03-30
PCT/US2002/010062 WO2002080528A1 (en) 2001-03-30 2002-03-29 Digital signal transmitter synchronization system

Publications (2)

Publication Number Publication Date
CA2438138A1 true CA2438138A1 (en) 2002-10-10
CA2438138C CA2438138C (en) 2007-03-13

Family

ID=23072764

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002438138A Expired - Lifetime CA2438138C (en) 2001-03-30 2002-03-29 Digital signal transmitter synchronization system

Country Status (5)

Country Link
US (2) US7110048B2 (en)
KR (1) KR20030094313A (en)
CA (1) CA2438138C (en)
MX (1) MXPA03008769A (en)
WO (1) WO2002080528A1 (en)

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Also Published As

Publication number Publication date
US7667780B2 (en) 2010-02-23
CA2438138C (en) 2007-03-13
MXPA03008769A (en) 2004-02-12
US7110048B2 (en) 2006-09-19
US20060143677A1 (en) 2006-06-29
KR20030094313A (en) 2003-12-11
US20020140867A1 (en) 2002-10-03
WO2002080528A1 (en) 2002-10-10

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Effective date: 20220329