CA2241408A1 - Using special ntsc receiver to detect when co-channel interfering ntsc signal accompanies a digital tv signal - Google Patents

Using special ntsc receiver to detect when co-channel interfering ntsc signal accompanies a digital tv signal

Info

Publication number
CA2241408A1
CA2241408A1 CA002241408A CA2241408A CA2241408A1 CA 2241408 A1 CA2241408 A1 CA 2241408A1 CA 002241408 A CA002241408 A CA 002241408A CA 2241408 A CA2241408 A CA 2241408A CA 2241408 A1 CA2241408 A1 CA 2241408A1
Authority
CA
Canada
Prior art keywords
signal
digital television
ntsc
channel interfering
television signal
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
CA002241408A
Other languages
French (fr)
Other versions
CA2241408C (en
Inventor
Allen Leroy Limberg
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.)
Samsung Electronics Co Ltd
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
Priority claimed from US08/882,540 external-priority patent/US5852476A/en
Application filed by Individual filed Critical Individual
Publication of CA2241408A1 publication Critical patent/CA2241408A1/en
Application granted granted Critical
Publication of CA2241408C publication Critical patent/CA2241408C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Television Receiver Circuits (AREA)
  • Color Television Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Picture Signal Circuits (AREA)

Abstract

A method for detecting when a digital television signal is accompanied by co-channel interfering NTSC signal of substantial amplitude is described for use in a digital television receiver. The video portion of any co-channel interfering NTSC
signal is synchrodyned to baseband, for generating an in-phase demodulation result including first artifacts of the digital television signal, and for generating aquadrature-phase demodulation result including second artifacts of the digital television signal.
The quadrature-phase demodulation results are phase shifted by 90° at frequencies in a prescribed frequency range before being linearly combined with the in-phase quadrature-phase demodulation results, to generate a linear combining result substantially free of the first and second artifacts of the digital television signal in the prescribed frequency range. An indication that the digital television signal is accompanied by co-channel interfering NTSC signal of substantial amplitude is generated by detecting whenever the amplitude of the linear combining result exceeds a prescribed value.
CA002241408A 1997-06-25 1998-06-23 Using special ntsc receiver to detect when co-channel interfering ntsc signal accompanies a digital tv signal Expired - Fee Related CA2241408C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/882,540 US5852476A (en) 1997-03-21 1997-06-25 Using special NTSC receiver to detect when co-channel interfering NTSC signal accompanies a digital tv signal
US08/882,540 1997-06-25

Publications (2)

Publication Number Publication Date
CA2241408A1 true CA2241408A1 (en) 1998-12-25
CA2241408C CA2241408C (en) 2002-04-09

Family

ID=25380813

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002241408A Expired - Fee Related CA2241408C (en) 1997-06-25 1998-06-23 Using special ntsc receiver to detect when co-channel interfering ntsc signal accompanies a digital tv signal

Country Status (3)

Country Link
JP (1) JP3576816B2 (en)
KR (1) KR100274743B1 (en)
CA (1) CA2241408C (en)

Also Published As

Publication number Publication date
JPH1175134A (en) 1999-03-16
JP3576816B2 (en) 2004-10-13
CA2241408C (en) 2002-04-09
KR100274743B1 (en) 2000-12-15
KR19990007349A (en) 1999-01-25

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20100623