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Class Information
Number: 370/526
Name: Multiplex communications > Communication techniques for information carried in plural channels > Combining or distributing information via time channels > Signaling (ancillary to main information) > Digital tone detection
Description: Subject matter including a detector of digital tone or digital wave signals.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7558223 |
OFDM receiving method of OFDM receiver for receiving an OFDM signal via a plurality of space paths |
Jul. 7, 2009 |
| 7522515 |
Method and system for providing window shaping for multiline transmission in a communications system |
Apr. 21, 2009 |
| 7486665 |
Transport of DTMF tones over VOATM/VOIP networks |
Feb. 3, 2009 |
| 7468992 |
Voice and data exchange over a packet based network with DTMF |
Dec. 23, 2008 |
| 7453912 |
Methods and apparatus for selecting between multiple carriers based on signal energy measurements |
Nov. 18, 2008 |
| 7440410 |
Off-line broadband network interface |
Oct. 21, 2008 |
| 7394771 |
Apparatus and method for data communication including establishing communication using tone signal |
Jul. 1, 2008 |
| 7313233 |
Tone clamping and replacement |
Dec. 25, 2007 |
| 7272136 |
Dual tone multi frequency signal detection |
Sep. 18, 2007 |
| 7269142 |
Managing tone clamping in a network |
Sep. 11, 2007 |
| 7236585 |
Apparatus and method for noise immunity during signal detection |
Jun. 26, 2007 |
| 7233605 |
Method and apparatus for minimizing delay induced by DTMF processing in packet telephony systems |
Jun. 19, 2007 |
| 7209433 |
Channel estimation and compensation techniques for use in frequency division multiplexed systems |
Apr. 24, 2007 |
| 7161931 |
Voice and data exchange over a packet based network |
Jan. 9, 2007 |
| 7158543 |
V.8bis suppression method and apparatus for modem relay |
Jan. 2, 2007 |
| 7136434 |
Apparatus and method for detecting energy of tone signal |
Nov. 14, 2006 |
| 7126934 |
Method for base station compressing and transmitting high speed data |
Oct. 24, 2006 |
| 7082143 |
Voice and data exchange over a packet based network with DTMF |
Jul. 25, 2006 |
| 7058066 |
Controlling the transition glitch that occurs when a gateway switches from voice over IP to voice band data |
Jun. 6, 2006 |
| 7035293 |
Tone relay |
Apr. 25, 2006 |
| 6967946 |
Voice and data exchange over a packet based network with precise tone plan |
Nov. 22, 2005 |
| 6952430 |
System and method for interfacing a data link protocol engine and a physical layer |
Oct. 4, 2005 |
| 6944169 |
Method and apparatus for managing quality of service in network devices |
Sep. 13, 2005 |
| 6931076 |
Signal detector |
Aug. 16, 2005 |
| 6904060 |
System and method for transporting a call in a telecommunication network |
Jun. 7, 2005 |
| 6873701 |
System and method for DTMF detection using likelihood ratios |
Mar. 29, 2005 |
| 6850493 |
Off-line broadband network interface |
Feb. 1, 2005 |
| 6816511 |
Transcoding device provided with a derivation |
Nov. 9, 2004 |
| 6807234 |
Method and apparatus for constellation mapping and bitloading in multi-carrier transceivers, such as DMT-based DSL transceivers |
Oct. 19, 2004 |
| 6771767 |
Signal detector with coefficient swapping transform unit |
Aug. 3, 2004 |
| 6771641 |
DTMF digit collection and transportation for a packet network |
Aug. 3, 2004 |
| 6760348 |
System and method for tone detection in a discrete multi-tone system |
Jul. 6, 2004 |
| 6735303 |
Periodic signal detector |
May. 11, 2004 |
| 6701133 |
Apparatus for and method of synchronising oscillators within a data communication system |
Mar. 2, 2004 |
| 6687368 |
Tone signal detecting method and tone signal detector |
Feb. 3, 2004 |
| 6650662 |
Method and system for transmitting a DTMF signal with compressed voice in a packet switching network |
Nov. 18, 2003 |
| 6580792 |
Signal detector with automatic gain control |
Jun. 17, 2003 |
| 6574334 |
Efficient dynamic energy thresholding in multiple-tone multiple frequency detectors |
Jun. 3, 2003 |
| 6574207 |
Method for subscriber unit compressing and transmitting high speed data |
Jun. 3, 2003 |
| 6487243 |
Modems, methods, and computer program products for recovering from errors in a tone reversal sequence between two modems |
Nov. 26, 2002 |
| 6480555 |
Method and apparatus for extended range frequency correction burst detection |
Nov. 12, 2002 |
| 6421323 |
Method and apparatus for analyzing events in a telecommunications system |
Jul. 16, 2002 |
| 6400709 |
DTMF detection in internet telephony |
Jun. 4, 2002 |
| 6396883 |
Method for detection of pilot tones |
May. 28, 2002 |
| 6396851 |
DTMF tone detection and suppression with application to computer telephony over packet switched networks |
May. 28, 2002 |
| 6385189 |
Method and apparatus for compressing and transmitting high speed data |
May. 7, 2002 |
| 6266350 |
Off-line broadband network interface |
Jul. 24, 2001 |
| 6266342 |
Adaption resource module and operating method therefor |
Jul. 24, 2001 |
| 6259691 |
System and method for efficiently transporting dual-tone multi-frequency/multiple frequency (DTMF/MF) tones in a telephone connection on a network-based telephone system |
Jul. 10, 2001 |
| 6249531 |
Universal voice/fax/modem line over compressed media |
Jun. 19, 2001 |
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