H04S 5/02
Pseudo-stereo systems: of the pseudo four-channel type
Official title: of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals
H04S5/02 (Pseudo-stereo systems: of the pseudo four-channel type) appears on 209 US grants and 179 published applications in this corpus.
Search patents in H04S- Granted patents
- 209
- Published applications
- 179
- Assignees
- 92
- Inventors
- 283
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 9 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 5 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 6 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 3 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 2 | 0 |
| 2006 | 0 | 4 |
| 2007 | 2 | 24 |
| 2008 | 0 | 10 |
| 2009 | 2 | 5 |
| 2010 | 15 | 3 |
| 2011 | 12 | 9 |
| 2012 | 10 | 7 |
| 2013 | 1 | 3 |
| 2014 | 2 | 2 |
| 2015 | 6 | 11 |
| 2016 | 4 | 3 |
| 2017 | 9 | 15 |
| 2018 | 9 | 27 |
| 2019 | 19 | 12 |
| 2020 | 14 | 5 |
| 2021 | 11 | 6 |
| 2022 | 6 | 6 |
| 2023 | 6 | 8 |
| 2024 | 4 | 3 |
| 2025 | 12 | 10 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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By later US patents
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- Multichannel active matrix encoder and decoder with maximum lateral separation91US 5,870,480 ALexicon Corporation · 1999
- Audio-digital processing system for demultiplexing stereophonic/quadriphonic input audio signals into 4-to-72 output audio signals89US 4,251,688 A1981