H03G 9/18
For tone control and volume expansion or compression
Official title: for tone control and volume expansion or compression
H03G9/18 (For tone control and volume expansion or compression) appears on 117 US grants and 98 published applications in this corpus.
Search patents in H03G- Granted patents
- 117
- Published applications
- 98
- Assignees
- 66
- Inventors
- 186
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 4 |
| 2007 | 3 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 5 |
| 2010 | 0 | 7 |
| 2011 | 1 | 5 |
| 2012 | 5 | 9 |
| 2013 | 9 | 4 |
| 2014 | 7 | 3 |
| 2015 | 4 | 4 |
| 2016 | 2 | 11 |
| 2017 | 5 | 1 |
| 2018 | 5 | 1 |
| 2019 | 4 | 9 |
| 2020 | 10 | 9 |
| 2021 | 9 | 9 |
| 2022 | 5 | 6 |
| 2023 | 5 | 4 |
| 2024 | 4 | 1 |
| 2025 | 3 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Loudspeaker system provided with dynamic speech equalization12 Aug 2025US 12,387,739 B2EPOS Group A/S
- Dynamic range control for a wide variety of playback environments28 Jan 2025US 12,210,799 B2Dolby International AB
- Signal processing7 Jan 2025US 12,190,901 B2Sony Group Corporation
- Dialogue enhancement in audio codec10 Sep 2024US 12,087,317 B2Dolby International AB
- Audio device and audio signal processing method16 Jul 2024US 12,040,760 B2Yamaha Corporation
- Dynamic range control for a wide variety of playback environments31 Jul 2025US 2025/0244946 A1Dolby International AB
- Dynamic range control for a wide variety of playback environments23 May 2024US 2024/0168706 A1Dolby International AB
- Loudspeaker system provided with dynamic speech equalization15 Jun 2023US 2023/0186931 A1EPOS Group A/S
- Dynamic range control for a wide variety of playback environments9 Mar 2023US 2023/0075445 A1Dolby International AB
- Amplitude limiting circuit for sound signal5 Jan 2023US 2023/0006628 A1
Most cited
By later US patents
- Multi-band programmable compression system142US 4,882,762 AResound Corporation · 1989
- Automatic equalizing system with DFT and FFT138US 4,628,530 AU. S. Philips Corporation · 1986
- Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal62US 8,199,933 B2Dolby Laboratories Licensing Corporation · 2012
- Noise reduction device in an electroacoustic system57US 4,815,142 AElison · 1989
- Processing of an audio signal for presentation in a high noise environment54US 7,254,243 B22007