H03G 7/00
Volume compression or expansion in amplifiers
Official title: Volume compression or expansion in amplifiers {(frequency dependent H03G9/025)}
H03G7/00 (Volume compression or expansion in amplifiers) appears on 1,377 US grants and 994 published applications in this corpus.
Search patents in H03G- Granted patents
- 1,377
- Published applications
- 994
- Assignees
- 562
- Inventors
- 1,953
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 6 | 0 |
| 1978 | 15 | 0 |
| 1979 | 5 | 0 |
| 1980 | 13 | 0 |
| 1981 | 12 | 0 |
| 1982 | 13 | 0 |
| 1983 | 19 | 0 |
| 1984 | 19 | 0 |
| 1985 | 20 | 0 |
| 1986 | 10 | 0 |
| 1987 | 16 | 0 |
| 1988 | 19 | 0 |
| 1989 | 13 | 0 |
| 1990 | 19 | 0 |
| 1991 | 20 | 0 |
| 1992 | 18 | 0 |
| 1993 | 12 | 0 |
| 1994 | 25 | 0 |
| 1995 | 21 | 0 |
| 1996 | 28 | 0 |
| 1997 | 29 | 0 |
| 1998 | 41 | 0 |
| 1999 | 18 | 0 |
| 2000 | 23 | 0 |
| 2001 | 16 | 6 |
| 2002 | 12 | 34 |
| 2003 | 17 | 32 |
| 2004 | 29 | 27 |
| 2005 | 23 | 36 |
| 2006 | 25 | 26 |
| 2007 | 15 | 24 |
| 2008 | 28 | 29 |
| 2009 | 22 | 38 |
| 2010 | 23 | 43 |
| 2011 | 22 | 19 |
| 2012 | 37 | 38 |
| 2013 | 39 | 34 |
| 2014 | 28 | 38 |
| 2015 | 34 | 43 |
| 2016 | 52 | 65 |
| 2017 | 78 | 59 |
| 2018 | 64 | 61 |
| 2019 | 81 | 65 |
| 2020 | 66 | 65 |
| 2021 | 49 | 55 |
| 2022 | 55 | 39 |
| 2023 | 42 | 33 |
| 2024 | 37 | 36 |
| 2025 | 27 | 30 |
| 2026 | 9 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H03G 7/002In untuned or low-frequency amplifiers625
- H03G 7/007Volume compression or expansion in amplifiers: of digital or coded signals501
- H03G 7/06Volume compression or expansion in amplifiers: having semiconductor devices281
- H03G 7/001Without controlling loop137
- H03G 7/008Control by a pilot signal16
- H03G 7/02Volume compression or expansion in amplifiers: having discharge tubes10
Recent patents
- Automatic volume leveling6 Oct 2026US 12,756,370 B2Bose Corporation
- Auto-recovery overcurrent protection for audio notification appliance circuit in fire protection system6 Oct 2026US 12,756,974 B2Tyco Fire & Security GmbH
- Dynamic audio normalization process8 Sep 2026US 12,732,148 B2Comcast Cable Communications, LLC
- Audio signal processing method and apparatus, electronic device, and storage medium4 Aug 2026US 12,701,357 B2Vivo Mobile Communication Co., Ltd.
- System and method for non-destructively normalizing loudness of audio signals within portable devices21 Jul 2026US 12,688,861 B2Dolby International AB
- Adaptive dynamic range control13 Aug 2026US 2026/0238916 A1Marshall Group AB (Publ)
- Dialog Intelligibility Enhancement Method and System6 Aug 2026US 2026/0229243 A1DTS, Inc.
- System and method for audio peak limiting16 Jul 2026US 2026/0205084 A1Harman International Industries, Incorporated
- Current-sourcing temperature compensated logarithmic transimpedance amplifier using npn matched transistors with output adjustable voltage18 Jun 2026US 2026/0170274 A1Ciena Corporation
- Method, apparatus and computer program11 Jun 2026US 2026/0162665 A1Nokia Technologies Oy
Most cited
By later US patents
- Controlling and manipulating groupings in a multi-zone media system1,881US 8,483,853 B1Sonos, Inc. · 2013
- Adjusting dynamic range of an audio system319US 8,229,125 B2Bose Corporation · 2012
- Method and system for selectively and variably attenuating audio data260US 6,498,855 B1International Business Machines Corporation · 2002
- Digital audio limiter231US 5,579,404 ADolby Laboratories Licensing Corporation · 1996
- Output level control apparatus224US 4,926,485 APioneer Electronic Corporation · 1990