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METHOD FOR CONFIGURING A DIGITAL AUDIO FILTER, DIGITAL AUDIO FILTER, AND SOUND SYSTEM
Publication No.
EP3985998
•
App No.
EP20202571
•
Filed by
Alps Alpine Co., Ltd.
•
Filed on
2020-10-19
•
Issued/Published on
2024-08-14
Publication No.
EP3985998
A1
Application No.
EP20202571
Filed: 2020-10-19
Grant Date
2020-10-19
Mention of grant
Active Oppositions
1 Active
EPO Oppositions
Patent Abstract / Summary
[0001] A method for configuring a digital audio filter (8) includes: providing a decaying impulse response in the time domain, representing at least part of the transfer characteristics of the digital audio filter (8); determining the poles and zeros of the decaying impulse response in the z-domain; selecting at least one subset of the poles and zeros of the decaying impulse response; and, for each of the at least one subset of the poles and zeros: determining a respective subset impulse response (70) in the time domain, windowing the respective subset impulse response in the time domain, and configuring the digital audio filter (8) in accordance with the windowed respective subset impulse response (72; 74; 76; 78; 80; 82; 84).
IPC Classifications
H04S7/00, // H04R3/00
Priority Claims
No priority claims recorded
Designated Contracting States (38 EPC States)
Albania
(AL)
Austria
(AT)
Belgium
(BE)
Bulgaria
(BG)
Switzerland
(CH)
Cyprus
(CY)
Czech Republic
(CZ)
Germany
(DE)
Denmark
(DK)
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Spain
(ES)
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(FI)
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(LV)
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(NL)
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(NO)
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(PL)
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(PT)
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(RO)
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(RS)
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(SE)
Slovenia
(SI)
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(SK)
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(SM)
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(TR)
Parties & Representation
Applicants
Alps Alpine Co., Ltd.
1-7, Yukigaya-otsukamachi, Ota-ku
JPInventors (2)
DROUGGE, Per
417 55 Gothenburg
SEMOHLIN, Peter
417 55 Gothenburg
SERepresentatives / Agents
Schmitt-Nilson Schraud Waibel Wohlfrom Patentanwälte Partnerschaft mbB
Pelkovenstraße 143, 80992 München
DEAWA Sweden AB
Box 5117, 200 71 Malmö
SEKey Procedural Dates
Request-For-Examination
2022-10-19
Mention Of Grant Published
2020-10-19
First-Examination-Report-Despatched
2024-03-20
Patent Oppositions
Official opposition proceedings filed against European Patent EP3985998 under EPC Article 99.
#1
Opponent
Company
Dirac Research AB
Stationsgatan 23-25, plan 5, SE
Representative
AWA Sweden AB
Filing
Date
Opposition in Progress
2025-05-13
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|---|---|---|---|
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Patent & Non-Patent Citations
Cited documents and prior art referenced in search and examination reports.
Non-Patent Scientific Literature (NPL)
[XYI] - GOODWIN M M: "Realization of arbitrary filters in the STFT domain", APPLICATIONS OF SIGNAL PROCESSING TO AUDIO AND ACOUSTICS, 2009. WASPAA '09. IEEE WORKSHOP ON, IEEE, PISCATAWAY, NJ, USA, 18 October 2009 (2009-10-18), pages 353 - 356, XP031575134, ISBN: 978-1-4244-3678-1
- FRANK WEFERS: "Partitioned convolution algorithms for real-time auralization", 13 May 2015 (2015-05-13), XP055566796, Retrieved from the Internet <URL:http://publications.rwth-aachen.de/record/466561/files/466561.pdf?subformat=pdfa> [retrieved on 20190311]
- MATTI KARJALAINEN ET AL: "Frequency-Zooming ARMA Modeling of Resonant and Reverberant Systems", JOURNAL OF THE AUDIO ENGINEERING SOCIETY, AUDIO ENGINEERING SOCIETY, NEW YORK, NY, US, vol. 50, no. 12, 1 December 2002 (2002-12-01), pages 1012 - 1029, XP002552217, ISSN: 0004-7554
- JACKSON LELAND B: "Roundof f-Noise Analysis for Fixed- Point Digital Filters Realized in Cascade or Parallel Form", IEEE TRANSACTIONS ON AUDIO AND ELECTROACOUSTICS, vol. 18, no. 2, 30 June 1970 (1970-06-30), pages 107 - 122, XP055811940
- "An analysis of roundoff noise in digital filters", 31 December 1969, STEVENS INSTITUTE OF TECHNOLOGY, article JACKSON LELAND BROOKS: "Preview of "An analysis of roundoff noise in digital filters", Dissertation", pages: i - 15, XP055812003
- "Understanding digital signal processing", 31 December 2004, PRENTICE HALL PROFESSIONAL TECHNICAL REFERENCE, Upper Saddle River, NJ, ISBN: 978-0-13-108989-1, article LYONGS RICHARD G: "Sections 6.8 "Improving IIR Filters with Cascaded Structures" and 6.9 "A Brief Comparison of IIR and FIR Filters"", pages: 274 - 282, XP055812048
- STEFANIA CECCHI ET AL: "Room Response Equalization-A Review", APPLIED SCIENCES, vol. 8, no. 16, 23 December 2017 (2017-12-23), XP055570863, DOI: 10.3390/app8010016
- MATTI KARJALAINEN ET AL.: "Frequency-Zooming ARMA Modeling of Resonant and Reverberant Systems", JOURNAL OF THE AUDIO ENGINEERING SOCIETY, AUDIO ENGINEERING SOCIETY, NEW YORK, NY, US, vol. 50, no. 12, 1 December 2002 (2002-12-01), US , pages 1012 - 1029, XP002552217, ISSN: 0004-7554
- L.-J. BRANNMARK ; A. AHLEN: "Variable control of the pre-response error in mixed phase audio precompensation", APPLICATIONS OF SIGNAL PROCESSING TO AUDIO AND ACOUSTICS, 2009. WASPAA '09. IEEE WORKSHOP ON, IEEE, PISCATAWAY, NJ, USA, 18 October 2009 (2009-10-18), Piscataway, NJ, USA , pages 197 - 200, XP031575161, ISBN: 978-1-4244-3678-1
- M.M. GOODWIN: "Realization of arbitrary filters in the STFT domain", APPLICATIONS OF SIGNAL PROCESSING TO AUDIO AND ACOUSTICS, 2009. WASPAA '09. IEEE WORKSHOP ON, IEEE, PISCATAWAY, NJ, USA, 18 October 2009 (2009-10-18), Piscataway, NJ, USA , pages 353 - 356, XP031575134, ISBN: 978-1-4244-3678-1
- JACKSON LELAND B: "Roundoff-noise analysis for fixed-point digital filters realized in cascade or parallel form", IEEE TRANSACTIONS ON AUDIO AND ELECTROACOUSTICS., IEEE INC. NEW YORK., US, vol. 18, no. 2, 1 June 1970 (1970-06-01), US , pages 107 - 122, XP093279966, ISSN: 0018-9278, DOI: 10.1109/TAU.1970.1162084
- Appendix 1 - DEMONSTRATING THE EQUIVALENCE BETWEEN EXPONENTIAL WINDOWING OF AN IMPULSE RESPONSE AND RADIAL SCALING OF POLES AND ZEROS OF THE CORRESPONDING TRANSFER FUNCTION
Worldwide Patent Family
Related applications and patents in the same INPADOC worldwide family.
Official File Inspection
EPC Art. 128 Public Dossier
Complete European Patent Register Dossier (148 Total Documents)
The full inspection file for Application EP20202571 contains 148 total documents, including all notices of opposition, proprietor counter-statements, examination communications, third-party observations, and procedural forms. Below are all major recorded procedural filings and publication specifications.
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Date: 2024-08-14
Procedure: Grant
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Date: 2022-04-20
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