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Class Information
Number: 379/414
Name: Telephonic communications > Transmission line conditioning
Description: Subject matter for varying an electrical parameter of a telephone channel.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7603486 |
Network management system providing logic signals over communication lines for detecting peripheral devices |
Oct. 13, 2009 |
| 7574001 |
Internet protocol telephone system |
Aug. 11, 2009 |
| 7539301 |
Cost-effective multichannel digital logger |
May. 26, 2009 |
| 7450715 |
Transceiver for bidirectional frequency division multiplexed transmission |
Nov. 11, 2008 |
| 7440568 |
Bipolar pulse forming line |
Oct. 21, 2008 |
| 7408993 |
Digital communication extender system and method |
Aug. 5, 2008 |
| 7330703 |
Transceiver for bidirectional frequency division multiplexed transmission |
Feb. 12, 2008 |
| 7236587 |
Systems and methods for determining critical circuit diversity |
Jun. 26, 2007 |
| 7132613 |
Methods, systems, and terminals for load coil switching |
Nov. 7, 2006 |
| 7079773 |
Power feeding for an optical transmission system |
Jul. 18, 2006 |
| 7079646 |
ADSL receiver high pass filter architecture |
Jul. 18, 2006 |
| 6978015 |
Method and apparatus for cooperative diagnosis of impairments and mitigation of disturbers in communication systems |
Dec. 20, 2005 |
| 6970560 |
Method and apparatus for impairment diagnosis in communication systems |
Nov. 29, 2005 |
| 6920183 |
Crosstalk equalization for input-output driver circuits |
Jul. 19, 2005 |
| 6901143 |
Voice switching system capable of improving a quality of conversation |
May. 31, 2005 |
| 6870901 |
Design and architecture of an impairment diagnosis system for use in communications systems |
Mar. 22, 2005 |
| 6850618 |
Central office interface techniques for digital subscriber lines |
Feb. 1, 2005 |
| 6836509 |
Dsl- compatible pots line card |
Dec. 28, 2004 |
| 6785326 |
Method and apparatus for detecting and compensating digital losses in a communications network |
Aug. 31, 2004 |
| 6757386 |
Apparatus, system, and method for efficient reduction of electromagnetic interference in telecommunications equipment |
Jun. 29, 2004 |
| 6742170 |
Repeatable swizzling patterns for capacitive and inductive noise cancellation |
May. 25, 2004 |
| 6728366 |
Signal level adjustment arrangement |
Apr. 27, 2004 |
| 6694013 |
Filter arrangement and method for telecommunication device |
Feb. 17, 2004 |
| 6546100 |
Load coil device |
Apr. 8, 2003 |
| 6496577 |
Signal transmission for transmitting message to destination |
Dec. 17, 2002 |
| 6407609 |
Distortion precompensator and method of compensating for distortion in a transmission medium |
Jun. 18, 2002 |
| 6400822 |
Linear, optical coupled line impedance circuit |
Jun. 4, 2002 |
| 6393110 |
Methods and apparatus for terminating a line and supporting the asymmetric digital subscriber line protocol |
May. 21, 2002 |
| 6295343 |
Method and apparatus for combining voice line card and xDSL line card functions |
Sep. 25, 2001 |
| 6259788 |
Technique for balancing loads in a communication network |
Jul. 10, 2001 |
| 6141377 |
Method and apparatus for voice frequency noise reduction in splitterless ADSL |
Oct. 31, 2000 |
| 6111949 |
Method of rapid automatic hybrid balancing |
Aug. 29, 2000 |
| 6111935 |
Adaptive expansion table in a digital telephone receiver |
Aug. 29, 2000 |
| 6097262 |
Transmission line impedance matching apparatus |
Aug. 1, 2000 |
| 5953412 |
Method and apparatus for controlling line conditioner equalizer |
Sep. 14, 1999 |
| 5896449 |
Voice enhancement system and method |
Apr. 20, 1999 |
| 5802164 |
Systems and methods for controlling telephone sound enhancement on a per call basis |
Sep. 1, 1998 |
| 5692041 |
Telephone subscriber circuit with galvanic isolation |
Nov. 25, 1997 |
| 5649009 |
Differential longitudinal amplifier for a subscriber line interface circuit |
Jul. 15, 1997 |
| 5642416 |
AM broadcast band interference filter for line-powered telephone |
Jun. 24, 1997 |
| 5617473 |
Sign bit integrator and method |
Apr. 1, 1997 |
| 5610564 |
AC integrated coupler with phase equalizer |
Mar. 11, 1997 |
| 5577117 |
Methods and apparatus for estimating and adjusting the frequency response of telecommunications channels |
Nov. 19, 1996 |
| 5555285 |
Multi-variate system having an intelligent telecommunications interface with automatic adaptive delay distortion equalization (and related method) |
Sep. 10, 1996 |
| 5519755 |
Circuit for a line simulating device |
May. 21, 1996 |
| 5511119 |
Method and system for compensating for coupling between circuits of quaded cable in a telecommunication transmission system |
Apr. 23, 1996 |
| 5471527 |
Voice enhancement system and method |
Nov. 28, 1995 |
| 5459787 |
Circuit for the implementation of an impedance for a telephone speech circuit |
Oct. 17, 1995 |
| 5402485 |
Two-wire termination impedance generation circuit of subscriber circuit |
Mar. 28, 1995 |
| 5349640 |
Option bus adapter |
Sep. 20, 1994 |
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