CA2239317A1 - Method and apparatus for synchronizing signals - Google Patents

Method and apparatus for synchronizing signals

Info

Publication number
CA2239317A1
CA2239317A1 CA 2239317 CA2239317A CA2239317A1 CA 2239317 A1 CA2239317 A1 CA 2239317A1 CA 2239317 CA2239317 CA 2239317 CA 2239317 A CA2239317 A CA 2239317A CA 2239317 A1 CA2239317 A1 CA 2239317A1
Authority
CA
Canada
Prior art keywords
signal
time
master
code data
slave
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
CA 2239317
Other languages
French (fr)
Other versions
CA2239317C (en
Inventor
Richard A. Kupnicki
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.)
HB CANADA COMMUNICATIONS Ltd
Original Assignee
Leitch Technology Corp
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
Priority claimed from CA002206614A external-priority patent/CA2206614A1/en
Application filed by Leitch Technology Corp filed Critical Leitch Technology Corp
Priority to CA 2239317 priority Critical patent/CA2239317C/en
Publication of CA2239317A1 publication Critical patent/CA2239317A1/en
Application granted granted Critical
Publication of CA2239317C publication Critical patent/CA2239317C/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]
    • H04N21/20—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
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4305—Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/06—Generation of synchronising signals
    • H04N5/067—Arrangements or circuits at the transmitter end
    • H04N5/073—Arrangements or circuits at the transmitter end for mutually locking plural sources of synchronising signals, e.g. studios or relay stations

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

A method and apparatus for synchronizing unrelated reference signals originating from two or more sources at different locations, which signals may be in different signal formats and/or subject to different delays at the receiving station. A master generator having an absolute time input from a highly stable time source generates a master reference signal having a frequency that is a common multiple of the frequencies of the unrelated reference signals. A counter is implemented from an arbitrary initial time point and the time elapsed from the initial time point to a synchronizing event is periodically encoded into the master reference signal as time code data. A slave generator associated with each information signal is genlocked to the master reference signal, and the time code data is encoded into the slave reference outputs. Each synchronizing event is thus associated with time code data specifying the absolute time of the synchronizing event, which can be inserted into an upstream position in the slave reference output associated with the information signal. Thus, two signals originating from different locations can be precisely synchronized so that transmission from one source to the other is synchronous and signal timings are known in advance.
CA 2239317 1997-05-30 1998-05-29 Method and apparatus for synchronizing signals Expired - Lifetime CA2239317C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2239317 CA2239317C (en) 1997-05-30 1998-05-29 Method and apparatus for synchronizing signals

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CA002206614A CA2206614A1 (en) 1997-05-30 1997-05-30 Method and apparatus for absolute time descriptor universal reference signals for the synchronization of video and audio equipment in analog and digital areas
CA2,206,614 1997-05-30
CA 2239317 CA2239317C (en) 1997-05-30 1998-05-29 Method and apparatus for synchronizing signals

Publications (2)

Publication Number Publication Date
CA2239317A1 true CA2239317A1 (en) 1998-11-30
CA2239317C CA2239317C (en) 2004-01-20

Family

ID=25679393

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2239317 Expired - Lifetime CA2239317C (en) 1997-05-30 1998-05-29 Method and apparatus for synchronizing signals

Country Status (1)

Country Link
CA (1) CA2239317C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0942606A2 (en) * 1998-03-13 1999-09-15 Sarnoff Corporation Synchronization system and method
US6870887B2 (en) 2001-04-09 2005-03-22 International Business Machines Corporation Method and system for synchronization between different content encoding formats
US7280738B2 (en) 2001-04-09 2007-10-09 International Business Machines Corporation Method and system for specifying a selection of content segments stored in different formats
US8767778B2 (en) 2008-07-28 2014-07-01 Imagine Communications Corp. Method, system and apparatus for synchronizing signals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0942606A2 (en) * 1998-03-13 1999-09-15 Sarnoff Corporation Synchronization system and method
EP0942606A3 (en) * 1998-03-13 2002-08-07 Sarnoff Corporation Synchronization system and method
US6870887B2 (en) 2001-04-09 2005-03-22 International Business Machines Corporation Method and system for synchronization between different content encoding formats
US7280738B2 (en) 2001-04-09 2007-10-09 International Business Machines Corporation Method and system for specifying a selection of content segments stored in different formats
US8630528B2 (en) 2001-04-09 2014-01-14 International Business Machines Corporation Method and system for specifying a selection of content segments stored in different formats
US8767778B2 (en) 2008-07-28 2014-07-01 Imagine Communications Corp. Method, system and apparatus for synchronizing signals

Also Published As

Publication number Publication date
CA2239317C (en) 2004-01-20

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Effective date: 20180529