H03H 17/04
Recursive filters
H03H17/04 (Recursive filters) appears on 398 US grants and 245 published applications in this corpus.
Search patents in H03H- Granted patents
- 398
- Published applications
- 245
- Assignees
- 251
- Inventors
- 702
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 11 | 0 |
| 1981 | 4 | 0 |
| 1982 | 7 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 5 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 10 | 0 |
| 1989 | 8 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 6 | 0 |
| 1998 | 13 | 0 |
| 1999 | 12 | 0 |
| 2000 | 8 | 0 |
| 2001 | 8 | 3 |
| 2002 | 11 | 13 |
| 2003 | 8 | 8 |
| 2004 | 4 | 12 |
| 2005 | 8 | 15 |
| 2006 | 11 | 7 |
| 2007 | 12 | 14 |
| 2008 | 9 | 16 |
| 2009 | 12 | 5 |
| 2010 | 8 | 10 |
| 2011 | 4 | 10 |
| 2012 | 5 | 10 |
| 2013 | 13 | 9 |
| 2014 | 14 | 9 |
| 2015 | 14 | 10 |
| 2016 | 5 | 16 |
| 2017 | 18 | 9 |
| 2018 | 14 | 13 |
| 2019 | 14 | 16 |
| 2020 | 23 | 5 |
| 2021 | 6 | 12 |
| 2022 | 9 | 6 |
| 2023 | 9 | 6 |
| 2024 | 2 | 5 |
| 2025 | 4 | 2 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H03H 17/0416With input-sampling frequency and output-delivery frequency which differ102
- H03H 17/0461Quantisation45
- H03H 2017/0472Based on allpass structuresIndexing code16
- H03H 17/0411Using delta modulation13
- H03H 17/0405Comprising a rom addressed by the input and output data signals8
- H03H 2017/0477Direct form iIndexing code7
- H03H 2017/0488Direct form iiIndexing code3
Recent patents
- Signal control system and method for quantum computing, and waveform calibration circuit9 Jun 2026US 12,651,185 B2Institute of Software, Chinese Academy of Sciences
- Reducing comb filtering for hearing devices19 May 2026US 12,634,641 B2Starkey Laboratories, Inc.
- Event analysis and display25 Nov 2025US 12,481,343 B2Schweitzer Engineering Laboratories, Inc.
- Filter assembly, in particular for a control loop for controlling the position of at least one element11 Nov 2025US 12,468,115 B2Carl Zeiss SMT GmbH
- Data recovery using gradients25 Feb 2025US 12,237,962 B2
- Reducing comb filtering for hearing devices10 Sep 2026US 2026/0270628 A1Starkey Laboratories, Inc.
- Iir filter device and filtering method thereof3 Sep 2026US 2026/0261255 A1Actions Technology Co., Limited
- Adaptive filter and associated control method16 Jul 2026US 2026/0205096 A1Faraday Technology Corp.
- Low-latency data acquisition using sigma-delta modulators2 Apr 2026US 2026/0095194 A1Texas Instruments Incorporated
- Filter chains with improved signal to noise ratio10 Apr 2025US 2025/0119122 A1Infineon Technologies AG
Most cited
By later US patents
- Optimum second order digital filter167US 4,356,558 AMartin Marietta Corporation · 1982
- FPGA implemented bit-serial multiplier and infinite impulse response89US 6,438,570 B1Xilinx, Inc. · 2002
- Transversal filter for use in a digital subscriber line transmission interface88US 5,367,540 AFujitsu Limited · 1994
- Recursive digital filter with reset78US 6,167,415 ALucent Technologies Inc. · 2000
- Reduced multiplier digital IIR filters64US 6,263,354 B1Texas Instruments Incorporated · 2001