CA2594362A1 - Directional audio signal processing using an oversampled filterbank - Google Patents

Directional audio signal processing using an oversampled filterbank Download PDF

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Publication number
CA2594362A1
CA2594362A1 CA002594362A CA2594362A CA2594362A1 CA 2594362 A1 CA2594362 A1 CA 2594362A1 CA 002594362 A CA002594362 A CA 002594362A CA 2594362 A CA2594362 A CA 2594362A CA 2594362 A1 CA2594362 A1 CA 2594362A1
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CA
Canada
Prior art keywords
oversampled
filterbank
information signal
time domain
processing
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
CA002594362A
Other languages
French (fr)
Other versions
CA2594362C (en
Inventor
Robert L. Brennan
Edward Y. Chau
Hamid Sheikhzadeh Nadjar
Todd Schneider
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.)
Emma Mixed Signal CV
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Individual
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Filing date
Publication date
Priority claimed from CA002354858A external-priority patent/CA2354858A1/en
Application filed by Individual filed Critical Individual
Priority to CA002594362A priority Critical patent/CA2594362C/en
Publication of CA2594362A1 publication Critical patent/CA2594362A1/en
Application granted granted Critical
Publication of CA2594362C publication Critical patent/CA2594362C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/405—Arrangements for obtaining a desired directivity characteristic by combining a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/505—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing
    • H04R25/507—Customised settings for obtaining desired overall acoustical characteristics using digital signal processing implemented by neural network or fuzzy logic

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  • 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)
  • Complex Calculations (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Measurement Of Radiation (AREA)

Abstract

A directional signal processing system for beamforming information signals.
The system includes an oversampled filterbank, which has an analysis filterbank for transforming the information signals in time domain into channel signals in transform domain, a synthesis filterbank and a signal processor. The signal processor processes the outputs of the analysis filterbank for beamforming the information signals. The synthesis filterbank transforms the outputs of the signal processor to a single information signal in time domain.

Claims (4)

1. A method of processing at least one information signal in time domain for achieving approximately linear phase response, said method comprising the steps of:
performing an oversampled transformation using at least one oversampled analysis filterbank, said oversampled transformation transforming said information signal in time domain to a plurality of channel signals in transform domain;
outputting said channel signals from said oversampled analysis filterbank; and performing filtering by applying one or more filters to said channel signals to achieve the approximately linear phase response.
2. A method of processing at least one information signal as claimed in claim 1, wherein said filter is an IIR filter.
3. A method of processing at least one information signal as claimed in claim 1 or 2, wherein the step of performing an oversampled transformation comprises:
at said at least one oversampled analysis filterbank, applying at least one fractional delay impulse response to at least one filterbank prototype window.
4. A method of processing at least one information signal as claimed in any one of claims 1-3, further comprising:
at a synthesis filterbank, transforming one or more outputs from said filter to an output signal in time domain.
CA002594362A 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank Expired - Lifetime CA2594362C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002594362A CA2594362C (en) 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CA2,354,858 2001-08-08
CA002354858A CA2354858A1 (en) 2001-08-08 2001-08-08 Subband directional audio signal processing using an oversampled filterbank
CA002594362A CA2594362C (en) 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank
CA002397009A CA2397009C (en) 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002397009A Division CA2397009C (en) 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank

Publications (2)

Publication Number Publication Date
CA2594362A1 true CA2594362A1 (en) 2003-02-08
CA2594362C CA2594362C (en) 2009-12-15

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
CA002397009A Expired - Lifetime CA2397009C (en) 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank
CA002594362A Expired - Lifetime CA2594362C (en) 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA002397009A Expired - Lifetime CA2397009C (en) 2001-08-08 2002-08-07 Directional audio signal processing using an oversampled filterbank

Country Status (1)

Country Link
CA (2) CA2397009C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2452945C (en) * 2003-09-23 2016-05-10 Mcmaster University Binaural adaptive hearing system
US9947323B2 (en) * 2016-04-01 2018-04-17 Intel Corporation Synthetic oversampling to enhance speaker identification or verification
EP3598777B1 (en) * 2018-07-18 2023-10-11 Oticon A/s A hearing device comprising a speech presence probability estimator

Also Published As

Publication number Publication date
CA2594362C (en) 2009-12-15
CA2397009C (en) 2007-10-23
CA2397009A1 (en) 2003-02-08

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Effective date: 20220808