CA2594362A1 - Directional audio signal processing using an oversampled filterbank - Google Patents
Directional audio signal processing using an oversampled filterbank Download PDFInfo
- 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
- Authority
- 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
Links
- 238000000034 method Methods 0.000 claims 5
- 230000009466 transformation Effects 0.000 claims 3
- 230000001131 transforming effect Effects 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 238000003786 synthesis reaction Methods 0.000 claims 1
Classifications
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- 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
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)
- Complex Calculations (AREA)
- Circuit For Audible Band Transducer (AREA)
- Measurement Of Radiation (AREA)
- Compression, Expansion, Code Conversion, And Decoders (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.
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.
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.
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.
at a synthesis filterbank, transforming one or more outputs from said filter to an output signal in time domain.
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
ID=25682678
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)
| 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 |
-
2002
- 2002-08-07 CA CA002397009A patent/CA2397009C/en not_active Expired - Lifetime
- 2002-08-07 CA CA002594362A patent/CA2594362C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2397009C (en) | 2007-10-23 |
| CA2397009A1 (en) | 2003-02-08 |
| CA2594362C (en) | 2009-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20220808 |