H03H 21/0027
Filtering in the frequency domain
Official title: {filtering in the frequency domain}
H03H21/0027 (Filtering in the frequency domain) appears on 46 US grants and 37 published applications in this corpus.
Search patents in H03H- Granted patents
- 46
- Published applications
- 37
- Assignees
- 38
- Inventors
- 103
- Latest grant
- 7 Jun 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 0 | 2 |
| 2003 | 0 | 5 |
| 2004 | 0 | 1 |
| 2005 | 3 | 1 |
| 2006 | 4 | 2 |
| 2007 | 1 | 2 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 2 | 3 |
| 2011 | 2 | 1 |
| 2012 | 1 | 1 |
| 2013 | 2 | 2 |
| 2014 | 3 | 4 |
| 2015 | 4 | 1 |
| 2016 | 1 | 1 |
| 2017 | 1 | 2 |
| 2018 | 3 | 2 |
| 2019 | 3 | 1 |
| 2020 | 1 | 1 |
| 2021 | 1 | 2 |
| 2022 | 2 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Acoustic source separation systems7 Jun 2022US 11,354,536 B2Audiotelligence Limited
- Pole-zero blocking matrix for low-delay far-field beamforming26 Apr 2022US 11,315,543 B2Cirrus Logic, Inc.
- Synchronized switching of wireless platforms28 Dec 2021US 11,212,803 B2Apple Inc.
- Frequency domain coefficient-based dynamic adaptation control of adaptive filter29 Sep 2020US 10,789,933 B1Cirrus Logic, Inc.
- Adaptive filter unit for being used as an echo canceller10 Dec 2019US 10,506,105 B2Sennheiser Communication A/S
- Automatic training of echo canceller in upstream signal receivers on quiet subcarriers6 Mar 2025US 2025/0080163 A1Avago Technologies International Sales Pte. Limited
- Synchronized Switching of Wireless Platforms16 Sep 2021US 2021/0289498 A1Apple Inc.
- Pole-zero blocking matrix for low-delay far-field beamforming29 Jul 2021US 2021/0233509 A1Cirrus Logic International Semiconductor Ltd.
- Acoustic source separation systems28 May 2020US 2020/0167602 A1Audiotelligence Limited
- Adaptive filter unit for being used as an echo canceller18 Jul 2019US 2019/0222699 A1Sennheiser Communications A/S
Most cited
By later US patents
- Adaptive noise suppressor141US 4,658,426 A1987
- Normalized frequency domain LMS adaptive filter109US 4,939,685 AHughes Aircraft Company · 1990
- Low-delay subband adaptive filter85US 5,329,587 AAT&T Bell Laboratories · 1994
- Sub-band adaptive signal processing in an oversampled filterbank61US 7,110,554 B2AMI Semiconductor, Inc. · 2006
- Adaptive noise cancellation device32US 5,568,558 AInternational Business Machines Corporation · 1996