SE9102333D0 - PROCEDURE AND DEVICE FOR DIGITAL FILTERING - Google Patents
PROCEDURE AND DEVICE FOR DIGITAL FILTERINGInfo
- Publication number
- SE9102333D0 SE9102333D0 SE9102333A SE9102333A SE9102333D0 SE 9102333 D0 SE9102333 D0 SE 9102333D0 SE 9102333 A SE9102333 A SE 9102333A SE 9102333 A SE9102333 A SE 9102333A SE 9102333 D0 SE9102333 D0 SE 9102333D0
- Authority
- SE
- Sweden
- Prior art keywords
- branches
- filters
- taps
- procedure
- convolutions
- Prior art date
Links
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Reverberation, Karaoke And Other Acoustics (AREA)
- Auxiliary Devices For Music (AREA)
Abstract
A procedure for filtering an incoming signal, representing a sound, in order to achieve an intended modification to the character of the sound, comprises feeding the incoming signal to a number of parallel filter branches, convolution of the signal in the branches and mixing of the branches' output signals. During the procedure time discrete digital signals are used. The convolutions are executed with differing sampling frequencies for signals in the various branches. Those for convolution used taps are kept at a distance of one sampling period from each other, and the convolutions in all branches together are executed with minimum 5000 taps. A filter device for the realization of the procedure comprises a number of parallel connected part-filters of transversal type and a mixing device to mix the part-filters' output signals. The used taps of the part-filters are placed at a distance of one sampling period from each other. The part-filters together have at least 5000 taps and are arranged to work with differing sampling frequency.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9102333A SE9102333D0 (en) | 1991-08-12 | 1991-08-12 | PROCEDURE AND DEVICE FOR DIGITAL FILTERING |
PCT/SE1992/000521 WO1993004529A1 (en) | 1991-08-12 | 1992-07-17 | A digital filtering method and apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9102333A SE9102333D0 (en) | 1991-08-12 | 1991-08-12 | PROCEDURE AND DEVICE FOR DIGITAL FILTERING |
Publications (1)
Publication Number | Publication Date |
---|---|
SE9102333D0 true SE9102333D0 (en) | 1991-08-12 |
Family
ID=20383449
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9102333A SE9102333D0 (en) | 1991-08-12 | 1991-08-12 | PROCEDURE AND DEVICE FOR DIGITAL FILTERING |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE9102333D0 (en) |
WO (1) | WO1993004529A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE516467C2 (en) * | 2000-05-19 | 2002-01-15 | Philipson Lars H G | Method and apparatus for convolution |
US9824677B2 (en) | 2011-06-03 | 2017-11-21 | Cirrus Logic, Inc. | Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (ANC) |
US9318094B2 (en) | 2011-06-03 | 2016-04-19 | Cirrus Logic, Inc. | Adaptive noise canceling architecture for a personal audio device |
US8958571B2 (en) | 2011-06-03 | 2015-02-17 | Cirrus Logic, Inc. | MIC covering detection in personal audio devices |
US9318090B2 (en) | 2012-05-10 | 2016-04-19 | Cirrus Logic, Inc. | Downlink tone detection and adaptation of a secondary path response model in an adaptive noise canceling system |
US9123321B2 (en) | 2012-05-10 | 2015-09-01 | Cirrus Logic, Inc. | Sequenced adaptation of anti-noise generator response and secondary path response in an adaptive noise canceling system |
US9532139B1 (en) | 2012-09-14 | 2016-12-27 | Cirrus Logic, Inc. | Dual-microphone frequency amplitude response self-calibration |
US9414150B2 (en) | 2013-03-14 | 2016-08-09 | Cirrus Logic, Inc. | Low-latency multi-driver adaptive noise canceling (ANC) system for a personal audio device |
US9666176B2 (en) | 2013-09-13 | 2017-05-30 | Cirrus Logic, Inc. | Systems and methods for adaptive noise cancellation by adaptively shaping internal white noise to train a secondary path |
US10219071B2 (en) | 2013-12-10 | 2019-02-26 | Cirrus Logic, Inc. | Systems and methods for bandlimiting anti-noise in personal audio devices having adaptive noise cancellation |
US9704472B2 (en) | 2013-12-10 | 2017-07-11 | Cirrus Logic, Inc. | Systems and methods for sharing secondary path information between audio channels in an adaptive noise cancellation system |
US9478212B1 (en) | 2014-09-03 | 2016-10-25 | Cirrus Logic, Inc. | Systems and methods for use of adaptive secondary path estimate to control equalization in an audio device |
US20160365084A1 (en) * | 2015-06-09 | 2016-12-15 | Cirrus Logic International Semiconductor Ltd. | Hybrid finite impulse response filter |
JP6964581B2 (en) | 2015-08-20 | 2021-11-10 | シーラス ロジック インターナショナル セミコンダクター リミテッド | Feedback Adaptive Noise Cancellation (ANC) Controllers and Methods with Feedback Responses Partially Provided by Fixed Response Filters |
US10013966B2 (en) | 2016-03-15 | 2018-07-03 | Cirrus Logic, Inc. | Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5952911A (en) * | 1982-09-20 | 1984-03-27 | Nec Corp | Transversal filter |
US4888808A (en) * | 1987-03-23 | 1989-12-19 | Matsushita Electric Industrial Co., Ltd. | Digital equalizer apparatus enabling separate phase and amplitude characteristic modification |
JP2646210B2 (en) * | 1987-05-27 | 1997-08-27 | ヤマハ株式会社 | Electroacoustic reverberation support device |
-
1991
- 1991-08-12 SE SE9102333A patent/SE9102333D0/en unknown
-
1992
- 1992-07-17 WO PCT/SE1992/000521 patent/WO1993004529A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO1993004529A1 (en) | 1993-03-04 |
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