H04B 1/1692
Using companding of the stereo difference signal
Official title: {using companding of the stereo difference signal, e.g. FMX (volume compression or expansion in amplifiers H03G7/00)}
H04B1/1692 (Using companding of the stereo difference signal) appears on 15 US grants and 5 published applications in this corpus.
Search patents in H04B- Granted patents
- 15
- Published applications
- 5
- Assignees
- 5
- Inventors
- 20
- Latest grant
- 22 Apr 2008
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 2 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for noise reduction of a FM signal22 Apr 2008US 7,362,872 B2Sony Deutschland GmbH
- FM composite signal processor15 Jun 1999US 5,913,152 ASolid Electronics Labs
- Signal distinction circuit1 Jan 1991US 4,982,431 ASanyo Electric Co., Ltd.
- Fm stereo demodulator20 Nov 1990US 4,972,482 ASanyo Electric Co., Ltd.
- FM/FMX stereophonic receiver10 Apr 1990US 4,916,741 ASanyo Electric Co., Ltd.
- Digital stereo multiplexing-demultiplexing system based on linear processing of a Delta - Sigma modulated bit-stream4 Jun 2020US 2020/0177220 A1
- Circuit for processing audio signals28 Jul 2005US 2005/0163321 A1Sanyo Electric Co., Ltd.
- Linear phase compander for FM broadcast6 Mar 2003US 2003/0045312 A1
- Method for noise reduction of a FM signal27 Feb 2003US 2003/0039371 A1Sony Deutschland GmbH
- FM composite signal processor18 Jul 2002US 2002/0094793 A1
Most cited
By later US patents
- Adaptive expanders for FM stereophonic broadcasting system utilizing companding of difference signal64US 4,602,381 ACBS Inc. · 1986
- Compatible transmission techniques for FM stereophonic radio and television24US 4,602,380 ACBS Inc. · 1986
- Selective decoder for compatible FM stereophonic system utilizing companding of difference signal21US 4,817,151 ABroadcast Technology Partners · 1989
- Fm stereo demodulator21US 4,972,482 ASanyo Electric Co., Ltd. · 1990
- FM stereophonic broadcasting system utilizing simultaneous companding and modulation/demodulation12US 4,771,464 ABroadcast Technology Partners · 1988