H03G 9/025
Frequency-dependent volume compression or expansion
Official title: {frequency-dependent volume compression or expansion, e.g. multiple-band systems (H03G9/10, H03G9/18 take precedence)}
H03G9/025 (Frequency-dependent volume compression or expansion) appears on 569 US grants and 464 published applications in this corpus.
Search patents in H03G- Granted patents
- 569
- Published applications
- 464
- Assignees
- 243
- Inventors
- 807
- Latest grant
- 6 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 3 | 0 |
| 1978 | 9 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 8 | 0 |
| 1982 | 9 | 0 |
| 1983 | 7 | 0 |
| 1984 | 14 | 0 |
| 1985 | 8 | 0 |
| 1986 | 5 | 0 |
| 1987 | 14 | 0 |
| 1988 | 7 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 5 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 8 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 2 | 9 |
| 2003 | 2 | 4 |
| 2004 | 3 | 5 |
| 2005 | 4 | 12 |
| 2006 | 4 | 5 |
| 2007 | 5 | 4 |
| 2008 | 3 | 8 |
| 2009 | 2 | 12 |
| 2010 | 2 | 19 |
| 2011 | 9 | 21 |
| 2012 | 18 | 26 |
| 2013 | 16 | 20 |
| 2014 | 28 | 30 |
| 2015 | 25 | 30 |
| 2016 | 39 | 35 |
| 2017 | 45 | 30 |
| 2018 | 36 | 23 |
| 2019 | 38 | 48 |
| 2020 | 43 | 34 |
| 2021 | 23 | 27 |
| 2022 | 23 | 16 |
| 2023 | 21 | 20 |
| 2024 | 16 | 9 |
| 2025 | 14 | 9 |
| 2026 | 1 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for acoustic adjustment using a loudness value and a clipping occurrence rate of a test sound source6 Jan 2026US 12,519,441 B2Panasonic Intellectual Property Management Co., Ltd.
- Method and apparatus for improving sound quality of speaker25 Nov 2025US 12,482,478 B2Huawei Technologies Co., Ltd.
- Hearing-assist systems and methods for audio quality enhancements in performance venues11 Nov 2025US 12,470,869 B2The Epstein Hear Us Now Foundation
- Speaker distortion compensation device and speaker unit23 Sep 2025US 12,425,786 B2Alps Alpine Co., Ltd.
- Loudspeaker system provided with dynamic speech equalization12 Aug 2025US 12,387,739 B2EPOS Group A/S
- System and method to provide personalized audio streaming and rendering13 Aug 2026US 2026/0236215 A1
- Techniques for automatic equalization of audio23 Jul 2026US 2026/0213720 A1Harman Becker Automotive Systems GmbH
- Hearing-assist systems and methods for audio quality enhancements in performance venues23 Jul 2026US 2026/0214385 A1The Epstein Hear Us Now Foundation
- Compression method for hearing aids14 May 2026US 2026/0136141 A1
- Information processing apparatus, and information processing method5 Mar 2026US 2026/0067618 A1Sharp Kabushiki Kaisha
Most cited
By later US patents
- Adaptive, programmable signal processing and filtering for hearing aids325US 5,027,410 AWisconsin Alumni Research Foundation · 1991
- Adjusting dynamic range of an audio system319US 8,229,125 B2Bose Corporation · 2012
- Approach for partially preserving music in the presence of intelligible speech203US 9,615,170 B2Harman International Industries, Incorporated · 2017
- System output control method and apparatus202US 7,027,981 B22006
- Method of controlling diaphragm excursion of electrodynamic loudspeakers175US 9,813,812 B2Analog Devices Global · 2017