WO1995022855A3 - Apparatus and methods for improving timing recovery of a system clock - Google Patents

Apparatus and methods for improving timing recovery of a system clock Download PDF

Info

Publication number
WO1995022855A3
WO1995022855A3 PCT/IB1995/000068 IB9500068W WO9522855A3 WO 1995022855 A3 WO1995022855 A3 WO 1995022855A3 IB 9500068 W IB9500068 W IB 9500068W WO 9522855 A3 WO9522855 A3 WO 9522855A3
Authority
WO
WIPO (PCT)
Prior art keywords
system clock
timing recovery
methods
offset value
volatile memory
Prior art date
Application number
PCT/IB1995/000068
Other languages
French (fr)
Other versions
WO1995022855A2 (en
Inventor
Cornelis Huizer
Original Assignee
Philips Electronics Nv
Philips Norden Ab
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 Philips Electronics Nv, Philips Norden Ab filed Critical Philips Electronics Nv
Priority to DE69516771T priority Critical patent/DE69516771T2/en
Priority to EP95905744A priority patent/EP0699369B1/en
Priority to JP7521691A priority patent/JPH08509346A/en
Publication of WO1995022855A2 publication Critical patent/WO1995022855A2/en
Publication of WO1995022855A3 publication Critical patent/WO1995022855A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
    • H04N5/126—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal indirectly commands a frequency generator
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

Apparatus and methods for improving timing recovery of a system clock by causing its frequency to be within a specified tolerance range during a timing recovery acquisition period for the system clock. The apparatus includes a voltage controlled oscillator for producing the system clock and a non-volatile memory containing an offset value. The non-volatile memory provides an offset value (representing an offset voltage value) which assures that the voltage controlled oscillator receives a voltage value which causes the frequency of the system clock to be within a specified tolerance range. The apparatus may also include a write control unit for determining and updating the offset value for a next timing recovery acquisition period. The methods include steps for performing these operations.
PCT/IB1995/000068 1994-02-15 1995-02-01 Apparatus and methods for improving timing recovery of a system clock WO1995022855A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69516771T DE69516771T2 (en) 1994-02-15 1995-02-01 DEVICE AND METHOD FOR IMPROVING THE SYNCHRONIZATION GENERATION OF A CLOCK SYSTEM
EP95905744A EP0699369B1 (en) 1994-02-15 1995-02-01 Apparatus and methods for improving timing recovery of a system clock
JP7521691A JPH08509346A (en) 1994-02-15 1995-02-01 Apparatus and method for improving system clock timing recovery

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/196,918 1994-02-15
US08/196,918 US5612981A (en) 1994-02-15 1994-02-15 Apparatus and methods for improving timing recovery of a system clock

Publications (2)

Publication Number Publication Date
WO1995022855A2 WO1995022855A2 (en) 1995-08-24
WO1995022855A3 true WO1995022855A3 (en) 1995-09-28

Family

ID=22727283

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1995/000068 WO1995022855A2 (en) 1994-02-15 1995-02-01 Apparatus and methods for improving timing recovery of a system clock

Country Status (5)

Country Link
US (1) US5612981A (en)
EP (1) EP0699369B1 (en)
JP (1) JPH08509346A (en)
DE (1) DE69516771T2 (en)
WO (1) WO1995022855A2 (en)

Families Citing this family (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710033A3 (en) * 1994-10-28 1999-06-09 Matsushita Electric Industrial Co., Ltd. MPEG video decoder having a high bandwidth memory
JP2891149B2 (en) * 1995-11-20 1999-05-17 日本電気株式会社 Phase control loop method
SE9504316D0 (en) * 1995-12-01 1995-12-01 Nokia Satellite Systems Ab Methods and systems for data transmission
DE19630397C1 (en) * 1996-07-26 1997-12-04 Siemens Ag Count difference provision system for digital transmission system
DE19647093A1 (en) * 1996-11-14 1998-05-28 Bosch Gmbh Robert Process for updating time stamps in a digital data stream and remultiplexer
JPH10322259A (en) * 1997-05-19 1998-12-04 Matsushita Electric Ind Co Ltd Digital cordless communication system
US6078594A (en) * 1997-09-26 2000-06-20 International Business Machines Corporation Protocol and procedure for automated channel change in an MPEG-2 compliant datastream
US6195403B1 (en) 1997-09-26 2001-02-27 International Business Machines Corporation Pulse generator for a voltage controlled oscillator
US6088357A (en) * 1997-09-26 2000-07-11 International Business Machines Corporation Auxiliary transport assist processor especially for an MPEG-2 compliant decoder
US6275507B1 (en) 1997-09-26 2001-08-14 International Business Machines Corporation Transport demultiplexor for an MPEG-2 compliant data stream
US6072771A (en) * 1997-09-26 2000-06-06 International Business Machines Corporation Detection of errors in table data
US6115422A (en) * 1997-09-26 2000-09-05 International Business Machines Corporation Protocol and procedure for time base change in an MPEG-2 compliant datastream
US6229801B1 (en) 1997-09-26 2001-05-08 International Business Machines Corporation Delivery of MPEG2 compliant table data
US6181706B1 (en) 1997-09-26 2001-01-30 International Business Machines Corporation Common buffer for multiple streams and control registers in an MPEG-2 compliant transport register
US6356567B2 (en) 1997-09-26 2002-03-12 International Business Machines Corporation Embedded clock recovery and difference filtering for an MPEG-2 compliant transport stream
US6377588B1 (en) * 1997-11-25 2002-04-23 Nec Corporation Method and apparatus for reducing jitter of a program clock reference in a transport stream of MPEG over ATM, and MPEG decoder
DE69801827T2 (en) * 1998-11-14 2002-03-28 Agilent Technologies Inc clock generator
US6556250B1 (en) 1999-08-10 2003-04-29 General Instrument Corporation Method and apparatus for providing a timing signal with high frequency accuracy in video equipment for supporting an on-screen display in the absence of a video signal
US6760798B1 (en) * 2000-07-13 2004-07-06 Arm Limited Interface mechanism and method for interfacing a real-time clock with a data processing circuit
KR100442286B1 (en) * 2002-02-25 2004-07-30 엘지전자 주식회사 Apparatus and method for compensating error of color appearance in Digital Broadcast Receiver
US6917247B2 (en) * 2002-04-26 2005-07-12 Broadcom Corporation NCO based timebase recovery system and method for A/V decoder
US7230651B2 (en) * 2002-10-22 2007-06-12 Broadcom Corporation A/V decoder having a clocking scheme that is independent of input data streams
US20040230673A1 (en) * 2003-04-17 2004-11-18 International Business Machines Corporation Virtual counter device tolerant to hardware counter resets
JP2007528159A (en) * 2004-02-26 2007-10-04 トムソン ライセンシング Method and apparatus for setting a voltage controlled crystal oscillator in a video processing apparatus
US8022773B2 (en) 2004-12-17 2011-09-20 Mitsubishi Electric Corporation Clock signal generation device, and wireless base station
FR2898454A1 (en) * 2006-03-13 2007-09-14 Thomson Licensing Sas SECURE MECHANISM FOR TRANSMITTING METER VALUE FOR TRANSMISSION OF A GENLOCK SIGNAL OVER AN IP NETWORK
US9544638B2 (en) * 2006-04-17 2017-01-10 Broadcom Corporation Method for reconstructing system time clock (STC) without carrying PCR
US8255962B2 (en) * 2008-05-28 2012-08-28 Broadcom Corporation Edge device reception verification/non-reception verification links to differing devices
US8209733B2 (en) * 2008-05-28 2012-06-26 Broadcom Corporation Edge device that enables efficient delivery of video to handheld device
US20090300687A1 (en) * 2008-05-28 2009-12-03 Broadcom Corporation Edge device establishing and adjusting wireless link parameters in accordance with qos-desired video data rate
JP5007832B2 (en) * 2008-06-30 2012-08-22 トヨタ紡織株式会社 In-vehicle wireless device
WO2010134482A1 (en) * 2009-05-22 2010-11-25 株式会社メガチップス Video playback system and video playback method
JP6164680B2 (en) * 2012-12-27 2017-07-19 リーダー電子株式会社 Method and apparatus for generating jitter-related data

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5260978A (en) * 1992-10-30 1993-11-09 Bell Communications Research, Inc. Synchronous residual time stamp for timing recovery in a broadband network
EP0577329A2 (en) * 1992-07-02 1994-01-05 AT&T Corp. Timing recovery for variable bit-rate video on asynchronous transfer mode (ATM) networks
FR2693865A1 (en) * 1992-07-17 1994-01-21 Thomson Csf Synchronisation of decoder to asynchronous transfer mode network - using decoder to monitor buffer memories at coder and decoder and to eliminate information elements when stored data exceeds threshold
EP0624983A2 (en) * 1993-05-13 1994-11-17 RCA Thomson Licensing Corporation Synchronization arrangement for a compressed video signal

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4151485A (en) * 1977-11-21 1979-04-24 Rockwell International Corporation Digital clock recovery circuit
IT1184024B (en) * 1985-12-17 1987-10-22 Cselt Centro Studi Lab Telecom REFERENCES TO NUMERIC PHASE HOOKING CIRCUITS
DE69204144T2 (en) * 1991-11-25 1996-03-21 Philips Electronics Nv Phase locked loop with frequency deviation detector and decoding circuit with such a phase locked loop.
DE69315614T2 (en) * 1992-04-23 1998-07-02 Hitachi Ltd Frequency synthesizer
JP2762852B2 (en) * 1992-07-30 1998-06-04 日本電気株式会社 Frequency stabilization circuit
US5381181A (en) * 1993-05-13 1995-01-10 Thomson Consumer Electronics, Inc. Clock recovery apparatus as for a compressed video signal
US5448598A (en) * 1993-07-06 1995-09-05 Standard Microsystems Corporation Analog PLL clock recovery circuit and a LAN transceiver employing the same
US5430485A (en) * 1993-09-30 1995-07-04 Thomson Consumer Electronics, Inc. Audio/video synchronization in a digital transmission system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0577329A2 (en) * 1992-07-02 1994-01-05 AT&T Corp. Timing recovery for variable bit-rate video on asynchronous transfer mode (ATM) networks
FR2693865A1 (en) * 1992-07-17 1994-01-21 Thomson Csf Synchronisation of decoder to asynchronous transfer mode network - using decoder to monitor buffer memories at coder and decoder and to eliminate information elements when stored data exceeds threshold
US5260978A (en) * 1992-10-30 1993-11-09 Bell Communications Research, Inc. Synchronous residual time stamp for timing recovery in a broadband network
EP0624983A2 (en) * 1993-05-13 1994-11-17 RCA Thomson Licensing Corporation Synchronization arrangement for a compressed video signal

Also Published As

Publication number Publication date
EP0699369A1 (en) 1996-03-06
DE69516771T2 (en) 2000-11-23
JPH08509346A (en) 1996-10-01
US5612981A (en) 1997-03-18
DE69516771D1 (en) 2000-06-15
WO1995022855A2 (en) 1995-08-24
EP0699369B1 (en) 2000-05-10

Similar Documents

Publication Publication Date Title
WO1995022855A3 (en) Apparatus and methods for improving timing recovery of a system clock
GB9623210D0 (en) A method of recovering data acquired and stored down a well,by an acoustic path,and apparatus for implementing the method
ATE116744T1 (en) DEVICE AND METHOD FOR CORRECTING DATE AND TIME.
AU1026295A (en) Method and apparatus for improving the apparent accuracy of a data receiver clock circuit
EP0126163A4 (en) Controller with status display unit.
AU2001283458A1 (en) Method and apparatus for crossing clock domain boundaries
GB8818665D0 (en) Methods & apparatus for synchronising clock signals
JPS5444831A (en) Correcting equipment for time-axis error
AU588239B2 (en) A write clock pulse generator used for a time base corrector
GB2296347B (en) Method and apparatus for adjusting the accuracy of electronic timepieces
AU3758299A (en) Method and apparatus for varying a clock frequency on a phase by phase basis
GB9414447D0 (en) Method and apparatus for accurate setting of time of day clock in a video receiver
GB2271492A (en) Apparatus for and method of synchronizing a clock signal
EP0781047A3 (en) System and method for extracting caption/teletext information from a video signal
JPS6465931A (en) Method and apparatus for correcting error
GB9620488D0 (en) Method of processing multi-level signals for simple clock recovery
JPS5437787A (en) Waveform comparative display method using crt
JPS57123455A (en) Instruction executing device
AU3894699A (en) Method and apparatus for low jitter clock recovery
JPS551556A (en) Multifunctional electronic watch
TW344171B (en) Method and apparatus for controlling a phase lock loop
GB1535860A (en) Method of and apparatus for tuning an aft-controlled electronic tuner to a desired frequency
EP1365411A3 (en) Record medium playback apparatus and record medium playback method
JPS53115129A (en) Time axis correcting device
JPS5694293A (en) Time correction circuit of electrochromic display watch

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): JP

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

WWE Wipo information: entry into national phase

Ref document number: 1995905744

Country of ref document: EP

AK Designated states

Kind code of ref document: A3

Designated state(s): JP

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWP Wipo information: published in national office

Ref document number: 1995905744

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1995905744

Country of ref document: EP