WO1999045741A3 - Directional microphone system - Google Patents

Directional microphone system Download PDF

Info

Publication number
WO1999045741A3
WO1999045741A3 PCT/US1999/004421 US9904421W WO9945741A3 WO 1999045741 A3 WO1999045741 A3 WO 1999045741A3 US 9904421 W US9904421 W US 9904421W WO 9945741 A3 WO9945741 A3 WO 9945741A3
Authority
WO
WIPO (PCT)
Prior art keywords
microphone elements
signal
sound
microphone
combined
Prior art date
Application number
PCT/US1999/004421
Other languages
French (fr)
Other versions
WO1999045741A2 (en
Inventor
Christopher Todd Welsh
Jeffrey Phillip Mcateer
Alan Dean Michel
Original Assignee
Mwm Acoustics Llc
Christopher Todd Welsh
Jeffrey Phillip Mcateer
Alan Dean Michel
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 Mwm Acoustics Llc, Christopher Todd Welsh, Jeffrey Phillip Mcateer, Alan Dean Michel filed Critical Mwm Acoustics Llc
Priority to AU27975/99A priority Critical patent/AU2797599A/en
Publication of WO1999045741A2 publication Critical patent/WO1999045741A2/en
Publication of WO1999045741A3 publication Critical patent/WO1999045741A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones 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; DEAF-AID SETS; 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

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 directional microphone system that utilizes multiple microphone elements (14, 16) combined to produce a monaural signal that substantially represents sound produced by a desired source is disclosed. The invention includes two or more microphone elements (14, 16), a combining element (20) and a cross-over portion (22). The microphone elements (14, 16) receive an acoustic energy composed of sound from a desired source, such as a talker and sound from undesired background noise. The combining element (20) then combines the two signals (28, 30) from the microphones (14, 16) into a combined signal (78). The cross-over portion (22) includes a first filter (24) for filtering the signal of one of the microphone elements, a second filter (26) for filtering the combined signal (78), and a unifying element (82) for combining the filtered signals to produce a monaural signal which has an extended frequency bandwidth response, without the need for expensive, dedicated circuitry or matched microphone elements. In one embodiment, which is used in connection with a computer, the microphone elements are connected to the stereo inputs of the computer.
PCT/US1999/004421 1998-03-02 1999-03-01 Directional microphone system WO1999045741A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU27975/99A AU2797599A (en) 1998-03-02 1999-03-01 Directional microphone system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7644398P 1998-03-02 1998-03-02
US60/076,443 1998-03-02

Publications (2)

Publication Number Publication Date
WO1999045741A2 WO1999045741A2 (en) 1999-09-10
WO1999045741A3 true WO1999045741A3 (en) 2008-03-20

Family

ID=22132051

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/004421 WO1999045741A2 (en) 1998-03-02 1999-03-01 Directional microphone system

Country Status (2)

Country Link
AU (1) AU2797599A (en)
WO (1) WO1999045741A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6480610B1 (en) 1999-09-21 2002-11-12 Sonic Innovations, Inc. Subband acoustic feedback cancellation in hearing aids
US6757395B1 (en) 2000-01-12 2004-06-29 Sonic Innovations, Inc. Noise reduction apparatus and method
WO2001060112A2 (en) * 2001-05-23 2001-08-16 Phonak Ag Method of generating an electrical output signal and acoustical/electrical conversion system
WO2003015459A2 (en) * 2001-08-10 2003-02-20 Rasmussen Digital Aps Sound processing system that exhibits arbitrary gradient response
US7274794B1 (en) 2001-08-10 2007-09-25 Sonic Innovations, Inc. Sound processing system including forward filter that exhibits arbitrary directivity and gradient response in single wave sound environment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644674A (en) * 1969-06-30 1972-02-22 Bell Telephone Labor Inc Ambient noise suppressor
US5473684A (en) * 1994-04-21 1995-12-05 At&T Corp. Noise-canceling differential microphone assembly
US5627901A (en) * 1993-06-23 1997-05-06 Apple Computer, Inc. Directional microphone for computer visual display monitor and method for construction
US5633935A (en) * 1993-04-13 1997-05-27 Matsushita Electric Industrial Co., Ltd. Stereo ultradirectional microphone apparatus
US5701344A (en) * 1995-08-23 1997-12-23 Canon Kabushiki Kaisha Audio processing apparatus
US5703957A (en) * 1995-06-30 1997-12-30 Lucent Technologies Inc. Directional microphone assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3644674A (en) * 1969-06-30 1972-02-22 Bell Telephone Labor Inc Ambient noise suppressor
US5633935A (en) * 1993-04-13 1997-05-27 Matsushita Electric Industrial Co., Ltd. Stereo ultradirectional microphone apparatus
US5627901A (en) * 1993-06-23 1997-05-06 Apple Computer, Inc. Directional microphone for computer visual display monitor and method for construction
US5473684A (en) * 1994-04-21 1995-12-05 At&T Corp. Noise-canceling differential microphone assembly
US5703957A (en) * 1995-06-30 1997-12-30 Lucent Technologies Inc. Directional microphone assembly
US5701344A (en) * 1995-08-23 1997-12-23 Canon Kabushiki Kaisha Audio processing apparatus

Also Published As

Publication number Publication date
WO1999045741A2 (en) 1999-09-10
AU2797599A (en) 1999-09-20

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