H03H 21/0012
Digital adaptive filters
Official title: {Digital adaptive filters}
H03H21/0012 (Digital adaptive filters) appears on 912 US grants and 527 published applications in this corpus.
Search patents in H03H- Granted patents
- 912
- Published applications
- 527
- Assignees
- 439
- Inventors
- 1,418
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 5 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 10 | 0 |
| 1988 | 16 | 0 |
| 1989 | 12 | 0 |
| 1990 | 11 | 0 |
| 1991 | 19 | 0 |
| 1992 | 12 | 0 |
| 1993 | 25 | 0 |
| 1994 | 28 | 0 |
| 1995 | 24 | 0 |
| 1996 | 35 | 0 |
| 1997 | 32 | 0 |
| 1998 | 35 | 0 |
| 1999 | 28 | 0 |
| 2000 | 22 | 0 |
| 2001 | 24 | 8 |
| 2002 | 17 | 23 |
| 2003 | 26 | 32 |
| 2004 | 34 | 45 |
| 2005 | 31 | 52 |
| 2006 | 40 | 29 |
| 2007 | 30 | 17 |
| 2008 | 28 | 24 |
| 2009 | 13 | 17 |
| 2010 | 27 | 17 |
| 2011 | 29 | 15 |
| 2012 | 20 | 23 |
| 2013 | 22 | 29 |
| 2014 | 26 | 19 |
| 2015 | 24 | 11 |
| 2016 | 21 | 19 |
| 2017 | 21 | 26 |
| 2018 | 22 | 19 |
| 2019 | 26 | 23 |
| 2020 | 29 | 17 |
| 2021 | 20 | 19 |
| 2022 | 15 | 4 |
| 2023 | 7 | 8 |
| 2024 | 7 | 15 |
| 2025 | 8 | 9 |
| 2026 | 8 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H03H 21/0025Particular filtering methods144
- H03H 21/0043Adaptive algorithms109
- H03H 2021/007Computation saving measuresIndexing code88
- H03H 2021/0085ApplicationsIndexing code54
- H03H 21/002Filters with a particular frequency response42
- H03H 21/0067Means or methods for compensation of undesirable effects37
- H03H 2021/0096With input-sampling frequency and output-delivery frequency which differIndexing code19
- H03H 21/0016Non linear filters19
All 11 subgroupsShow fewer
Recent patents
- Adaptive filter device and method for providing an output signal6 Oct 2026US 12,756,379 B2u-blox AG
- Techniques for diminishing latency in a distributed antenna system8 Sep 2026US 12,732,217 B2Outdoor Wireless Networks LLC
- Receiver with transcoder and adaptive filter25 Aug 2026US 12,719,452 B1Marvell Asia Pte Ltd
- Micromirror resonance supression using configurable filter14 Jul 2026US 12,683,585 B2Microsoft Technology Licensing, LLC
- Methods, systems, and apparatuses for reducing DC bias24 Mar 2026US 12,587,210 B2STMicroelectronics International N. V.
- Techniques for diminishing latency in a distributed antenna system8 Oct 2026US 2026/0312607 A1Outdoor Wireless Networks LLC
- Detecting and capturing event data in a time series sensor signal30 Jul 2026US 2026/0219661 A1Eaton Intelligent Power Limited
- Adaptive filter and associated control method16 Jul 2026US 2026/0205096 A1Faraday Technology Corp.
- Adaptive equalization circuit, adaptive equalization method, and reception device2 Jul 2026US 2026/0189318 A1Ntt Innovative Devices Corporation
- Hearing device with motion sensor used to detect feedback path instability21 May 2026US 2026/0143287 A1Starkey Laboratories, Inc.
Most cited
By later US patents
- Method and apparatus for estimating physiological parameters using model-based adaptive filtering457US 5,853,364 ANellcor Puritan Bennett LLC · 1998
- Method and apparatus for estimating physiological parameters using model-based adaptive filtering318US 6,083,172 ANellcor Puritan Bennett LLC · 2000
- ECG enhancement by adaptive cancellation of electrosurgical interference290US 4,537,200 AThe Board of Trustees of the Leland Stanford Junior University · 1985
- Method and apparatus for estimating physiological parameters using model-based adaptive filtering236US 6,411,833 B1Nellcor Puritan Bennett LLC · 2002
- Compensating filters232US 6,760,451 B12004