H04N 9/7936
By using a preemphasis network at the recording side and a deemphasis
Official title: {by using a preemphasis network at the recording side and a deemphasis network at the reproducing side}
H04N9/7936 (By using a preemphasis network at the recording side and a deemphasis) appears on 17 US grants and 1 published applications in this corpus.
Search patents in H04N- Granted patents
- 17
- Published applications
- 1
- Assignees
- 8
- Inventors
- 33
- Latest grant
- 13 Feb 2018
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- System and method for processing a video signal with reduced latency13 Feb 2018US 9,891,438 B2Freedom Scientific, Inc.
- Recording and reproduction of video signal8 Dec 1998US 5,848,221 AVictor Company of Japan, Ltd.
- Video signal emphasis and deemphasis method and apparatus23 Jun 1998US 5,771,333 AVictor Company of Japan, Ltd.
- Simple high-band record modulation circuit in 8MM video tape recorder25 Feb 1997US 5,606,424 ASamsung Electronics Co., Ltd.
- Recording control device and method utilizing a test signal having multiple frequencies28 Jan 1997US 5,598,273 AMitsubishi Denki Kabushiki Kaisha
Most cited
By later US patents
- Non-linear digital emphasis circuit21US 4,668,988 ASony Corporation · 1987
- Chrominance signal recording and reproducing apparatus20US 4,612,585 AHitachi, Ltd. · 1986
- Chroma signal recording and reproducing circuit16US 4,524,380 AHitachi, Ltd. · 1985
- Recording and reproducing apparatus for recording and reproducing a carrier chrominance signal with pre-emphasis and de-emphasis13US 4,626,927 AVictor Company of Japan, Ltd. · 1986
- Video noise reduction system with signal emphasis preceding FM modulation upper-band luminance8US 4,802,016 ASony Corporation · 1989