WO2003015458A3 - Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in multiple wave sound environment - Google Patents

Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in multiple wave sound environment Download PDF

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Publication number
WO2003015458A3
WO2003015458A3 PCT/EP2002/009029 EP0209029W WO03015458A3 WO 2003015458 A3 WO2003015458 A3 WO 2003015458A3 EP 0209029 W EP0209029 W EP 0209029W WO 03015458 A3 WO03015458 A3 WO 03015458A3
Authority
WO
WIPO (PCT)
Prior art keywords
processing system
system including
present
sound processing
multiple wave
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.)
Ceased
Application number
PCT/EP2002/009029
Other languages
French (fr)
Other versions
WO2003015458A2 (en
Inventor
Erik W Rasmussen
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.)
Rasmussen Digital APS
Original Assignee
Rasmussen Digital APS
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 Rasmussen Digital APS filed Critical Rasmussen Digital APS
Priority to EP02767370A priority Critical patent/EP1415502A2/en
Publication of WO2003015458A2 publication Critical patent/WO2003015458A2/en
Publication of WO2003015458A3 publication Critical patent/WO2003015458A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/004—Monitoring arrangements; Testing arrangements for microphones
    • H04R29/005—Microphone arrays
    • H04R29/006—Microphone matching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H04R3/005—Circuits for transducers for combining the signals of two or more microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
    • H04R2201/403—Linear arrays of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Electric hearing aids
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

A sound processing system including at least one microphone, an audio processor, and at least one output device. The audio processor includes an analog beamformer, a microphone equalizer, and an apparent incidence processor. Two different embodiments of the apparent incidence processor are disclosed, that is, wave generation method and a forward filtering method. Both embodiments use the same principles to estimate the properties of the individual waves of the sound field. With the present invention, it is possible to implement arbitrary directivity responses using a small number of microphones only, that is, two or three microphones. The present invention offers improved noise reduction also for environments with many independent noise sources. Furthermore, the present invention works for signals and noises with arbitrary statistics.
PCT/EP2002/009029 2001-08-10 2002-08-12 Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in multiple wave sound environment Ceased WO2003015458A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02767370A EP1415502A2 (en) 2001-08-10 2002-08-12 Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in multiple wave sound environment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92778401A 2001-08-10 2001-08-10
US09/927,784 2001-08-10

Publications (2)

Publication Number Publication Date
WO2003015458A2 WO2003015458A2 (en) 2003-02-20
WO2003015458A3 true WO2003015458A3 (en) 2003-10-23

Family

ID=25455251

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/009029 Ceased WO2003015458A2 (en) 2001-08-10 2002-08-12 Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in multiple wave sound environment

Country Status (2)

Country Link
EP (1) EP1415502A2 (en)
WO (1) WO2003015458A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101263734B (en) * 2005-09-02 2012-01-25 丰田自动车株式会社 Post filter for microphone array
WO2008061534A1 (en) * 2006-11-24 2008-05-29 Rasmussen Digital Aps Signal processing using spatial filter
US9467775B2 (en) 2011-09-02 2016-10-11 Gn Netcom A/S Method and a system for noise suppressing an audio signal
CN117896655B (en) * 2024-03-14 2024-07-30 深圳前海深蕾半导体有限公司 Balanced frequency divider circuit and terminal equipment

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057960A (en) * 1961-03-13 1962-10-09 Bell Telephone Labor Inc Normalized sound control system
US5978490A (en) * 1996-12-27 1999-11-02 Lg Electronics Inc. Directivity controlling apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057960A (en) * 1961-03-13 1962-10-09 Bell Telephone Labor Inc Normalized sound control system
US5978490A (en) * 1996-12-27 1999-11-02 Lg Electronics Inc. Directivity controlling apparatus

Also Published As

Publication number Publication date
WO2003015458A2 (en) 2003-02-20
EP1415502A2 (en) 2004-05-06

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