WO2007048815A3 - Method for the reduction of an interference signal in a room, and application of said method - Google Patents

Method for the reduction of an interference signal in a room, and application of said method Download PDF

Info

Publication number
WO2007048815A3
WO2007048815A3 PCT/EP2006/067785 EP2006067785W WO2007048815A3 WO 2007048815 A3 WO2007048815 A3 WO 2007048815A3 EP 2006067785 W EP2006067785 W EP 2006067785W WO 2007048815 A3 WO2007048815 A3 WO 2007048815A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
room
output signal
estimated
interference signal
Prior art date
Application number
PCT/EP2006/067785
Other languages
German (de)
French (fr)
Other versions
WO2007048815A2 (en
Inventor
Harry Bachmann
Original Assignee
Anocsys Ag
Harry Bachmann
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 Anocsys Ag, Harry Bachmann filed Critical Anocsys Ag
Priority to EP06807556A priority Critical patent/EP1941490A2/en
Publication of WO2007048815A2 publication Critical patent/WO2007048815A2/en
Publication of WO2007048815A3 publication Critical patent/WO2007048815A3/en

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Disclosed is a method for reducing an interference signal (x) in a room by means of an adaptive noise reduction system. According to said method, the interference signal (x) is detected using at least one sensor unit, a transmission path (1) of the room is estimated using an adaptive process by minimizing an error signal (e) which is determined from an actual output signal in the room and a signal (y) estimated with the aid of the transmission path (1), and the error signal (e) is fed to the adaptive process to continuously optimize the same. The invention is characterized in that the error signal (e) is fed to an additional filter unit (4) to generate an output signal (y2), a transmission function of the additional filter unit (4) is adjusted in accordance with the error signal (e) by means of another adaptive process, and the output signal (y2) is subtracted from the actual output signal along with the estimated signal (y).
PCT/EP2006/067785 2005-10-26 2006-10-26 Method for the reduction of an interference signal in a room, and application of said method WO2007048815A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06807556A EP1941490A2 (en) 2005-10-26 2006-10-26 Method for the reduction of an interference signal in a room, and application of said method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1717/05 2005-10-26
CH17172005 2005-10-26

Publications (2)

Publication Number Publication Date
WO2007048815A2 WO2007048815A2 (en) 2007-05-03
WO2007048815A3 true WO2007048815A3 (en) 2007-09-07

Family

ID=37968183

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/067785 WO2007048815A2 (en) 2005-10-26 2006-10-26 Method for the reduction of an interference signal in a room, and application of said method

Country Status (2)

Country Link
EP (1) EP1941490A2 (en)
WO (1) WO2007048815A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105377A (en) * 1990-02-09 1992-04-14 Noise Cancellation Technologies, Inc. Digital virtual earth active cancellation system
EP0622778A2 (en) * 1993-04-27 1994-11-02 Hughes Aircraft Company Non-integer sample delay active noise canceller
WO1995020841A1 (en) * 1994-01-31 1995-08-03 Noise Cancellation Technologies, Inc. Adaptative feedforward and feedback control system
EP1124218A1 (en) * 1999-08-20 2001-08-16 Matsushita Electric Industrial Co., Ltd. Noise reduction apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5105377A (en) * 1990-02-09 1992-04-14 Noise Cancellation Technologies, Inc. Digital virtual earth active cancellation system
EP0622778A2 (en) * 1993-04-27 1994-11-02 Hughes Aircraft Company Non-integer sample delay active noise canceller
WO1995020841A1 (en) * 1994-01-31 1995-08-03 Noise Cancellation Technologies, Inc. Adaptative feedforward and feedback control system
EP1124218A1 (en) * 1999-08-20 2001-08-16 Matsushita Electric Industrial Co., Ltd. Noise reduction apparatus

Also Published As

Publication number Publication date
EP1941490A2 (en) 2008-07-09
WO2007048815A2 (en) 2007-05-03

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