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Class Information
Number: 370/268
Name: Multiplex communications > Special services > Conferencing > Conferee signals combined or distributed via time channels > Using summation of conferee signals > Digital summation > Including cancellation of certain signals
Description: Subject matter wherein the digital summation is combined with a subtraction of certain signals (e.g., canceling one of the conferee signals).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7397772 |
Method and apparatus for acoustic echo cancellation in a communication system providing TTY/TDD service |
Jul. 8, 2008 |
| 7174192 |
Method for controlling a hands free system, radio apparatus, and hands free apparatus |
Feb. 6, 2007 |
| 7068780 |
Hybrid echo canceller |
Jun. 27, 2006 |
| 6859772 |
Mixed signal dynamical environment modeling |
Feb. 22, 2005 |
| 6515390 |
Electric drive apparatus with a rotor having two magnetizied disks |
Feb. 4, 2003 |
| 6466550 |
Distributed conferencing system utilizing data networks |
Oct. 15, 2002 |
| 6400760 |
Apparatus and method for an error signal compression technique in a fast adaptive equalizer circuit |
Jun. 4, 2002 |
| 6046518 |
Axial gap electrical machine |
Apr. 4, 2000 |
| 5724416 |
Normalization of calling party sound levels on a conference bridge |
Mar. 3, 1998 |
| 5666407 |
Software-based bridging system for full duplex audio telephone conferencing |
Sep. 9, 1997 |
| 5452298 |
Digital conference trunk system |
Sep. 19, 1995 |
| 5390177 |
Conferencing arrangement for compressed information signals |
Feb. 14, 1995 |
| 5379280 |
Conferencing system for distributed switching network |
Jan. 3, 1995 |
| 5054021 |
Circuit for nulling the talker's speech in a conference call and method thereof |
Oct. 1, 1991 |
| 5034947 |
Whisper circuit for a conference call bridge including talker nulling and method therefor |
Jul. 23, 1991 |
| 4907221 |
Apparatus for attenuating the echo signal in telephone fork circuits for telephone conference calls |
Mar. 6, 1990 |
| 4825433 |
Digital bridge for a time slot interchange digital switched matrix |
Apr. 25, 1989 |
| 4809262 |
Method of making conference call connections in computer-controlled digital telephone exchanges |
Feb. 28, 1989 |
| 4797876 |
Conferencing bridge |
Jan. 10, 1989 |
| 4794591 |
Digital voice switch for a multi-port conference circuit |
Dec. 27, 1988 |
| 4754258 |
Integrated digital circuit for processing speech signal |
Jun. 28, 1988 |
| 4677610 |
Three-port conference circuit for use in a digital telephone system |
Jun. 30, 1987 |
| 4635252 |
Conference circuit for digital communication systems |
Jan. 6, 1987 |
| 4608693 |
Fault detection arrangement for a digital conferencing system |
Aug. 26, 1986 |
| 4575845 |
Time division multiplex conferencer |
Mar. 11, 1986 |
| 4535445 |
Conferencing system adaptive signal conditioner |
Aug. 13, 1985 |
| 4509166 |
PCM Communication system and method of operation |
Apr. 2, 1985 |
| 4485469 |
Time slot interchanger |
Nov. 27, 1984 |
| 4477897 |
Linear time division multiplexed conferencer |
Oct. 16, 1984 |
| 4393496 |
Method for feeding call progress tones into conference connections |
Jul. 12, 1983 |
| 4300231 |
Digital system error correction arrangement |
Nov. 10, 1981 |
| 4289932 |
Conferencing communications system |
Sep. 15, 1981 |
| 4288871 |
Digital loop conferencing signal correction arrangement |
Sep. 8, 1981 |
| 4229814 |
Multiplex conference bridge |
Oct. 21, 1980 |
| 4225956 |
Multiplex conference bridge |
Sep. 30, 1980 |
| 4203005 |
Digital type telephone system having a conference function |
May. 13, 1980 |
| 4190742 |
Process and apparatus for producing conference connections in a PCM time multiplex switching system |
Feb. 26, 1980 |
| 4163871 |
Digital CVSD telephone conference circuit |
Aug. 7, 1979 |
| 4162376 |
Conference call circuit using reversible analog to digital converter |
Jul. 24, 1979 |
| RE29991 |
Adaptable time division switch |
May. 8, 1979 |
| 4153817 |
Digital conference circuit |
May. 8, 1979 |
| 4109111 |
Method and apparatus for establishing conference calls in a time division multiplex pulse code modulation switching system |
Aug. 22, 1978 |
| 4076966 |
Method of and system for handling conference calls in digital telephone exchange |
Feb. 28, 1978 |
| 4059735 |
Digital conference system |
Nov. 22, 1977 |
| 4054757 |
Conference circuit using PCM techniques |
Oct. 18, 1977 |
| 4049921 |
Method for forming a conference connection in a time division multiplex telecommunication switching system |
Sep. 20, 1977 |
| 4048449 |
Method for forming a conference connection in a telecommunication switching system |
Sep. 13, 1977 |
| 3971891 |
Adaptable time division switch |
Jul. 27, 1976 |
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