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CA2247555A1 - Ntsc interference detectors using comb filters that suppress dtv pilot carrier to extract ntsc artifacts - Google Patents

Ntsc interference detectors using comb filters that suppress dtv pilot carrier to extract ntsc artifacts

Info

Publication number
CA2247555A1
CA2247555A1 CA002247555A CA2247555A CA2247555A1 CA 2247555 A1 CA2247555 A1 CA 2247555A1 CA 002247555 A CA002247555 A CA 002247555A CA 2247555 A CA2247555 A CA 2247555A CA 2247555 A1 CA2247555 A1 CA 2247555A1
Authority
CA
Canada
Prior art keywords
comb filter
ntsc
channel
signal
artifacts
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
CA002247555A
Other languages
French (fr)
Other versions
CA2247555C (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
Application filed by Individual filed Critical Individual
Publication of CA2247555A1 publication Critical patent/CA2247555A1/en
Application granted granted Critical
Publication of CA2247555C publication Critical patent/CA2247555C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0064—Concatenated codes
    • H04L1/0065—Serial concatenated codes
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
    • H04L25/03133—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals with a non-recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • 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
    • H04N5/211—Ghost signal cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03375—Passband transmission
    • H04L2025/03382—Single of vestigal sideband
    • 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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Noise Elimination (AREA)
  • Picture Signal Circuits (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

A first comb filter differentially combines an I- or Q-channel baseband signal supplied as input signal to a co-channel NTSC interference detector for a DTV
receiver with that signal as subjected to a first amount of differential delay. This generates a first comb filter response in which artifacts arising from synchronous detection of the co-channel interfering analog television signal are suppressed. The detector includes a second comb filter that combines the input signal with that signal as subjected to a second amount of differential delay to generate a second comb filter response in which artifacts of the co-channel interference are reinforced. The first and second comb filters both use the same type of linear combiner so the direct term of input signal is treated similarly in the first comb filter response and in the second comb filter response. First and second amplitude detectors detect the respectiveamplitudes of these comb filter responses. An amplitude comparator compares the first and second amplitude detection responses and indicates, when and only when the first and second amplitude detection responses differ more than a prescribed amount, that co-channel interference is of sufficient strength to be objectionable.
CA002247555A 1997-09-19 1998-09-16 Ntsc interference detectors using comb filters that suppress dtv pilot carrier to extract ntsc artifacts Expired - Fee Related CA2247555C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US93393497A 1997-09-19 1997-09-19
US93774097A 1997-09-25 1997-09-25
US08/933,934 1997-09-25
US08/937,740 1997-09-25

Publications (2)

Publication Number Publication Date
CA2247555A1 true CA2247555A1 (en) 1999-03-19
CA2247555C CA2247555C (en) 2001-12-11

Family

ID=27130052

Family Applications (2)

Application Number Title Priority Date Filing Date
CA002247555A Expired - Fee Related CA2247555C (en) 1997-09-19 1998-09-16 Ntsc interference detectors using comb filters that suppress dtv pilot carrier to extract ntsc artifacts
CA002270994A Expired - Fee Related CA2270994C (en) 1997-09-19 1998-09-18 Method of operating the channel equalizer in a receiver for dtv signals subject to co-channel ntsc interference

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002270994A Expired - Fee Related CA2270994C (en) 1997-09-19 1998-09-18 Method of operating the channel equalizer in a receiver for dtv signals subject to co-channel ntsc interference

Country Status (8)

Country Link
JP (2) JP2000506716A (en)
KR (2) KR100557122B1 (en)
CN (2) CN1128550C (en)
AU (1) AU703907B1 (en)
BR (1) BR9803498A (en)
CA (2) CA2247555C (en)
SG (1) SG68079A1 (en)
WO (1) WO1999016240A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1089427B1 (en) * 1999-09-28 2007-07-18 Koninklijke Philips Electronics N.V. Method for the comparison of the amplitudes of two electrical signals
US6449002B1 (en) * 1999-12-21 2002-09-10 Thomson Licensing S.A. Truncated metric for NTSC interference rejection in the ATSC-HDTV trellis decoder
KR100705931B1 (en) * 2000-12-08 2007-04-11 엘지전자 주식회사 Complex Adaptive Channel Equalizer for GPS Receivers
CN100373372C (en) * 2002-09-17 2008-03-05 联发科技股份有限公司 Error correction system and method for automatic power control loop
AU2003298620A1 (en) * 2002-11-26 2004-06-18 Thomson Licensing S.A. An ntsc signal detector
KR100594275B1 (en) * 2004-05-14 2006-06-30 삼성전자주식회사 Digital television receiver with channel state generation circuit for NTSC cochannel interference cancellation and method thereof
KR100608000B1 (en) 2004-08-16 2006-08-02 삼성전자주식회사 Thermal image forming apparatus having a cooling fan
US7613238B2 (en) * 2005-09-13 2009-11-03 Mediatek Inc. Apparatus and method for decision error compensation in an adaptive equalizer
US7668209B2 (en) 2005-10-05 2010-02-23 Lg Electronics Inc. Method of processing traffic information and digital broadcast system
CN101944964B (en) * 2005-10-17 2012-10-31 Lg电子株式会社 Method for processing traffic information and digital broadcast system
US8238450B2 (en) 2009-01-30 2012-08-07 Futurewei Technologies Inc. Dynamic transmitter noise level adjustment for digital subscriber line systems
CN109716664B (en) * 2016-10-10 2020-06-16 华为技术有限公司 Comb filtering noise elimination method and device and frequency domain self-adaptive equalization device
JP7513869B2 (en) 2020-03-23 2024-07-10 澁谷工業株式会社 Exosome extraction device and exosome extraction method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5602602A (en) * 1994-02-10 1997-02-11 Philips Electronics North America Corporation Method and apparatus for combating co-channel NTSC interference for digital TV transmission having a simplified rejection filter
US5546132A (en) * 1994-12-07 1996-08-13 Goldstar Co., Ltd. NTSC interference detector
US5648822A (en) * 1995-05-19 1997-07-15 Philips Electronics North America Corporation Method and apparatus for combating co-channel NTSC interference using a variable-comb filter for digital TV transmission
US5594496A (en) * 1995-06-07 1997-01-14 Zenith Electronics Corporation Detection of co-channel interference in digital television signals

Also Published As

Publication number Publication date
CA2270994A1 (en) 1999-04-01
KR100278854B1 (en) 2001-01-15
SG68079A1 (en) 1999-10-19
AU703907B1 (en) 1999-04-01
KR19990029972A (en) 1999-04-26
CA2247555C (en) 2001-12-11
KR100557122B1 (en) 2006-03-03
BR9803498A (en) 1999-11-03
CN1239625A (en) 1999-12-22
CN1212581A (en) 1999-03-31
CA2270994C (en) 2002-06-04
JP3272678B2 (en) 2002-04-08
JPH11164222A (en) 1999-06-18
CN1122401C (en) 2003-09-24
KR20000069033A (en) 2000-11-25
WO1999016240A1 (en) 1999-04-01
JP2000506716A (en) 2000-05-30
CN1128550C (en) 2003-11-19

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 20090916