H03G 3/20
Automatic control
Official title: Automatic control ({H03G3/005 takes precedence;} combined with volume compression or expansion H03G7/00)
H03G3/20 (Automatic control) appears on 8,717 US grants and 7,157 published applications in this corpus.
Search patents in H03G- Granted patents
- 8,717
- Published applications
- 7,157
- Assignees
- 2,054
- Inventors
- 13,282
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 74 | 0 |
| 1977 | 59 | 0 |
| 1978 | 51 | 0 |
| 1979 | 54 | 0 |
| 1980 | 70 | 0 |
| 1981 | 65 | 0 |
| 1982 | 61 | 0 |
| 1983 | 68 | 0 |
| 1984 | 75 | 0 |
| 1985 | 85 | 0 |
| 1986 | 57 | 0 |
| 1987 | 67 | 0 |
| 1988 | 58 | 0 |
| 1989 | 63 | 0 |
| 1990 | 56 | 0 |
| 1991 | 60 | 0 |
| 1992 | 85 | 0 |
| 1993 | 88 | 0 |
| 1994 | 101 | 0 |
| 1995 | 88 | 0 |
| 1996 | 96 | 0 |
| 1997 | 96 | 0 |
| 1998 | 128 | 0 |
| 1999 | 126 | 0 |
| 2000 | 106 | 0 |
| 2001 | 117 | 52 |
| 2002 | 124 | 144 |
| 2003 | 131 | 218 |
| 2004 | 177 | 287 |
| 2005 | 125 | 286 |
| 2006 | 242 | 265 |
| 2007 | 218 | 311 |
| 2008 | 194 | 278 |
| 2009 | 215 | 290 |
| 2010 | 224 | 262 |
| 2011 | 269 | 254 |
| 2012 | 324 | 297 |
| 2013 | 317 | 317 |
| 2014 | 299 | 316 |
| 2015 | 365 | 337 |
| 2016 | 336 | 319 |
| 2017 | 437 | 340 |
| 2018 | 382 | 397 |
| 2019 | 461 | 371 |
| 2020 | 410 | 400 |
| 2021 | 303 | 291 |
| 2022 | 299 | 287 |
| 2023 | 265 | 281 |
| 2024 | 224 | 218 |
| 2025 | 183 | 190 |
| 2026 | 139 | 149 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Automatic volume leveling6 Oct 2026US 12,756,370 B2Bose Corporation
- Radio frequency low noise amplifiers29 Sep 2026US 12,750,021 B2Huawei Technologies Co., Ltd.
- Tunable effective inductance for multi-gain LNA with inductive source degeneration29 Sep 2026US 12,750,026 B2pSemi Corporation
- Power detectors with enhanced dynamic range29 Sep 2026US 12,750,076 B2Skyworks Solutions, Inc.
- Measurement and calibration of mismatch in an isolation channel29 Sep 2026US 12,750,078 B2Skyworks Solutions, Inc.
- Noise reduction earphone and earphone noise reduction method8 Oct 2026US 2026/0311673 A1Shenzhen Dancing Future Technology Ltd.
- Amplifier gain control for constant input impedance8 Oct 2026US 2026/0312559 A1pSemi Corporation
- Electrical isolation monitoring1 Oct 2026US 2026/0296243 A1Rivian IP Holdings, LLC
- Robust voice activity detector system for use with an earphone1 Oct 2026US 2026/0299875 A1ST DetectTech, LLC
- Systems and Methods for Intelligent Transimpedance Amplifiers1 Oct 2026US 2026/0303039 A1TeraSignal LLC
Most cited
By later US patents
- System and method for synchronizing operations among a plurality of independently clocked digital data processing devices1,949US 8,234,395 B2Sonos, Inc. · 2012
- Method and apparatus for automatically normalizing a perceived volume level in a digitally encoded file389US 7,072,477 B1Apple Computer, Inc. · 2006
- Apparatus and method for attenuating a multicarrier input signal of a linear device334US 5,384,547 AMotorola, Inc. · 1995
- Method and apparatus for using a sound sensor to adjust the audio output for a device326US 8,306,235 B2Apple Inc. · 2012
- Dynamic distortion elimination for output audio324US 8,045,721 B2Motorola Mobility LLC · 2011