H03H 17/0272
Quadrature mirror filters
Official title: {Quadrature mirror filters}
H03H17/0272 (Quadrature mirror filters) appears on 40 US grants and 37 published applications in this corpus.
Search patents in H03H- Granted patents
- 40
- Published applications
- 37
- Assignees
- 18
- Inventors
- 42
- Latest grant
- 29 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 3 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 5 |
| 2017 | 6 | 2 |
| 2018 | 2 | 5 |
| 2019 | 7 | 2 |
| 2020 | 1 | 1 |
| 2021 | 1 | 5 |
| 2022 | 4 | 5 |
| 2023 | 7 | 1 |
| 2024 | 3 | 2 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Matrix decomposition structure of two-channel quadrature mirror filter bank and coefficient design method thereof29 Jul 2025US 12,375,066 B1Hangzhou Dianzi University
- Resampling output signals of QMF based audio codecs26 Nov 2024US 12,154,583 B2Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V.
- System and method for processing audio data into a plurality of frequency components3 Sep 2024US 12,080,303 B2Immersion Networks, Inc.
- Resampling output signals of QMF based audio codec16 Apr 2024US 11,961,531 B2Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V.
- System and method for processing audio data into a plurality of frequency components21 Nov 2023US 11,823,691 B2Immersion Networks, Inc.
- Resampling output signals of qmf based audio codec6 Feb 2025US 2025/0046324 A1Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V.
- System and method for processing audio data14 Mar 2024US 2024/0087583 A1Immersion Networks, Inc.
- Resampling output signals of qmf based audio codecs8 Feb 2024US 2024/0046942 A1Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e. V.
- System and method for processing audio data25 May 2023US 2023/0162747 A1Immersion Networks, Inc.
- Resampling output signals of qmf based audio codec18 Aug 2022US 2022/0262380 A1Fraunhofer-Gesellschaft zur Foerderung der angewandfen Forschung e.V.
Most cited
By later US patents
- Quadrature mirror filters with staggered-phase subsampling73US 4,815,023 AGeneral Electric Company · 1989
- Digital filters73US 6,279,021 B1Sanyo Electric Co., Ltd. · 2001
- Noise attenuation system54US 5,406,635 ANokia Mobile Phones Ltd. · 1995
- Method and apparatus for processing audio signals22US 9,578,437 B2Wilus Institute of Standards and Technology Inc. · 2017
- Filter compressor and method for manufacturing compressed subband filter impulse responses21US 8,255,212 B2Dolby International AB · 2012