WO1997028643A3 - Vertical synchronisation signal detector - Google Patents

Vertical synchronisation signal detector Download PDF

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Publication number
WO1997028643A3
WO1997028643A3 PCT/IB1997/000026 IB9700026W WO9728643A3 WO 1997028643 A3 WO1997028643 A3 WO 1997028643A3 IB 9700026 W IB9700026 W IB 9700026W WO 9728643 A3 WO9728643 A3 WO 9728643A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
detection
detector
generating
composite video
Prior art date
Application number
PCT/IB1997/000026
Other languages
French (fr)
Other versions
WO1997028643A2 (en
Inventor
Jurgen Holger Titus Geerlings
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 JP9527440A priority Critical patent/JPH11505399A/en
Priority to AT97900075T priority patent/ATE209840T1/en
Priority to DE69708531T priority patent/DE69708531T2/en
Priority to EP97900075A priority patent/EP0819352B1/en
Publication of WO1997028643A2 publication Critical patent/WO1997028643A2/en
Publication of WO1997028643A3 publication Critical patent/WO1997028643A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Synchronizing For Television (AREA)
  • Television Systems (AREA)
  • Television Signal Processing For Recording (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A vertical synchronisation signal detector is disclosed for detecting a vertical synchronisation signal in a composite video signal. The detector comprises an input (1) for receiving the composite video signal, a first detector (4, 16, 22) for detecting equalisation pulses occurring in the composite video signal and for generating a first detection signal upon detection of an equalisation pulse, a second detector (4, 16, 20) for detecting horizontal sync pulses occurring in the composite video signal and for generating a second detection signal upon detection of a horizontal sync pulse, a third detector (4, 12) for detecting negative going pulses occurring in the composite video signal that have a longer duration than the horizontal sync pulses and for generating a third detection pulse upon detection of such a pulse, a first signal combination unit (FF1) for generating a fourth detection signal (VBI) in response to at least one first and second detection signal generated by the first and second detector respectively, a first counter (58) for counting, when being enabled, the number of occurrences of second detection signals generated by the second detector and for generating a first control signal upon the detection of n occurrences of such second detection signals, where n is a constant integer larger than 1. Further, a second signal combination unit (AND) is provided for combining the third and fourth detection signals so as to obtain a second control signal. A third signal combination unit (FF2) receives the first control signal generated by the first counter and the second control signal from the second signal combination unit and generates in response thereto an output signal which is indicative of the occurrence of the vertical synchronisation signal. The first counter is in an enabled state upon the presence of the output signal of the third signal combination unit (FF2).
PCT/IB1997/000026 1996-02-01 1997-01-17 Vertical synchronisation signal detector WO1997028643A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP9527440A JPH11505399A (en) 1996-02-01 1997-01-17 Vertical sync signal detector
AT97900075T ATE209840T1 (en) 1996-02-01 1997-01-17 DETECTOR FOR A VERTICAL SYNCHRONIZATION SIGNAL
DE69708531T DE69708531T2 (en) 1996-02-01 1997-01-17 Vertical synchronization signal detector
EP97900075A EP0819352B1 (en) 1996-02-01 1997-01-17 Vertical synchronisation signal detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP96200220.0 1996-02-01
EP96200220 1996-02-01

Publications (2)

Publication Number Publication Date
WO1997028643A2 WO1997028643A2 (en) 1997-08-07
WO1997028643A3 true WO1997028643A3 (en) 2001-04-12

Family

ID=8223621

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1997/000026 WO1997028643A2 (en) 1996-02-01 1997-01-17 Vertical synchronisation signal detector

Country Status (8)

Country Link
US (1) US5784121A (en)
EP (1) EP0819352B1 (en)
JP (1) JPH11505399A (en)
KR (1) KR19980703637A (en)
CN (1) CN1193438A (en)
AT (1) ATE209840T1 (en)
DE (1) DE69708531T2 (en)
WO (1) WO1997028643A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19743125A1 (en) * 1997-09-30 1999-04-08 Ise Interactive Systems Entwic Procedure for evaluating the quality of a television picture
KR100585078B1 (en) * 1999-12-24 2006-06-01 삼성전자주식회사 Circuit of auto detecting composite sync signal in monitor system
KR100484183B1 (en) * 2002-12-04 2005-04-20 삼성전자주식회사 Video reproducing device including apparatus and method for adjusting change of horizontal synchronous signal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454153A2 (en) * 1990-04-27 1991-10-30 Sanyo Electric Co., Ltd. Synchronizing circuit and counter in image pickup system
EP0580287A2 (en) * 1992-07-23 1994-01-26 Samsung Electronics Co., Ltd. Method and apparatus for detecting a frame sync signal
JPH06153023A (en) * 1992-11-05 1994-05-31 Sony Corp Pseudo vertical synchronizing signal detection device and monitoring device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU535411B2 (en) * 1979-12-29 1984-03-22 Sony Corporation Synchronizing signal detector
DE3343455A1 (en) * 1983-12-01 1985-06-13 Philips Patentverwaltung Gmbh, 2000 Hamburg CIRCUIT ARRANGEMENT FOR DETECTING THE VERTICAL BLANK GAPS IN AN IMAGE SIGNAL
US5189515A (en) * 1991-02-04 1993-02-23 Industrial Technology Research Institute Television synchronization signal separator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0454153A2 (en) * 1990-04-27 1991-10-30 Sanyo Electric Co., Ltd. Synchronizing circuit and counter in image pickup system
EP0580287A2 (en) * 1992-07-23 1994-01-26 Samsung Electronics Co., Ltd. Method and apparatus for detecting a frame sync signal
JPH06153023A (en) * 1992-11-05 1994-05-31 Sony Corp Pseudo vertical synchronizing signal detection device and monitoring device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 18, no. 470 (E - 1600) *

Also Published As

Publication number Publication date
DE69708531D1 (en) 2002-01-10
JPH11505399A (en) 1999-05-18
US5784121A (en) 1998-07-21
CN1193438A (en) 1998-09-16
DE69708531T2 (en) 2002-08-08
KR19980703637A (en) 1998-12-05
EP0819352A1 (en) 1998-01-21
ATE209840T1 (en) 2001-12-15
EP0819352B1 (en) 2001-11-28
WO1997028643A2 (en) 1997-08-07

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