H04Q 1/457
With conversion of multifrequency signals into digital signals
Official title: with conversion of multifrequency signals into digital signals
H04Q1/457 (With conversion of multifrequency signals into digital signals) appears on 216 US grants and 38 published applications in this corpus.
Search patents in H04Q- Granted patents
- 216
- Published applications
- 38
- Assignees
- 124
- Inventors
- 346
- Latest grant
- 28 Dec 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 19 | 0 |
| 1977 | 17 | 0 |
| 1978 | 8 | 0 |
| 1979 | 3 | 0 |
| 1980 | 10 | 0 |
| 1981 | 4 | 0 |
| 1982 | 9 | 0 |
| 1983 | 9 | 0 |
| 1984 | 6 | 0 |
| 1985 | 4 | 0 |
| 1986 | 9 | 0 |
| 1987 | 10 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 6 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 5 |
| 2003 | 6 | 2 |
| 2004 | 4 | 2 |
| 2005 | 2 | 3 |
| 2006 | 1 | 1 |
| 2007 | 1 | 1 |
| 2008 | 1 | 1 |
| 2009 | 2 | 2 |
| 2010 | 4 | 6 |
| 2011 | 1 | 4 |
| 2012 | 3 | 1 |
| 2013 | 4 | 2 |
| 2014 | 4 | 2 |
| 2015 | 6 | 3 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 1 |
| 2019 | 2 | 0 |
| 2020 | 0 | 1 |
| 2021 | 2 | 0 |
| 2022 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Remote device interface and telephone entry system28 Dec 2021US 11,210,876 B2Alarm.com Incorporated
- Wireless transmitter/receiver architecture for low-power wide area networks7 Sep 2021US 11,115,731 B1Amazon Technologies, Inc.
- Computer assisted patient navigation and information systems and methods16 Jul 2019US 10,354,051 B2Forge Laboratories, LLC
- Method and apparatus for intelligent dual-tone multi-frequency (DTMF) decoding and identification16 Apr 2019US 10,264,333 B1
- Method and apparatus for detecting a set up signal used for data communication over a communication network6 Jun 2017US 9,674,070 B2NXP USA, Inc.
- Remote device interface and telephone entry system7 Apr 2022US 2022/0108573 A1Alarm.com Incorporated
- Remote device interface and telephone entry system9 Apr 2020US 2020/0111274 A1Doorport Inc.
- Computer assisted patient navigation and information systems and methods22 Feb 2018US 2018/0052968 A1Grace Clinic Holdings, LLC
- Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope24 Dec 2015US 2015/0373429 A1Intel Corporation
- Low complexity tone/voice discrimination method using a rising edge of a frequency power envelope11 Jun 2015US 2015/0163363 A1LSI Corporation
Most cited
By later US patents
- Streamlined digital signal processor96US 4,718,057 AAdvanced Micro Devices, Inc. · 1988
- Multi-frequency signal detector and classifier65US 5,353,346 AMPR Teltech Ltd. · 1994
- Paging system with commands for changing functionality of a paging receiver55US 4,878,051 ATelefind Corp. · 1989
- Digital DTMF tone detector55US 5,119,322 AMitel Corporation · 1992
- Digital tone decoder and method of decoding tones using linear prediction coding53US 4,689,760 ADigital Sound Corporation · 1987