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Class Information
Number: 379/398
Name: Telephonic communications > Line equalization or impedance matching
Description: Subject matter including a circuit to cause the signal transmitted through the line to be independent of frequency, or providing for adjustment of the impedance thereof to optimize signal transmission to, and reception from, a telephone line.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7596699 |
Battery authentication system |
Sep. 29, 2009 |
| 7574001 |
Internet protocol telephone system |
Aug. 11, 2009 |
| 7561619 |
Feedback filter |
Jul. 14, 2009 |
| 7558385 |
Impedance adapter for a high-bandwidth transmission channel of a copper-wired terminal system |
Jul. 7, 2009 |
| 7548616 |
Termination device for a telephone line |
Jun. 16, 2009 |
| 7505580 |
IP telephone system |
Mar. 17, 2009 |
| 7496150 |
Transmission apparatus with variable impedance matching |
Feb. 24, 2009 |
| 7486786 |
Apparatus and method for performing impedance synthesis in a transmitter |
Feb. 3, 2009 |
| 7440568 |
Bipolar pulse forming line |
Oct. 21, 2008 |
| 7430291 |
Common mode transmission line termination |
Sep. 30, 2008 |
| 7321612 |
Bit stream conditioning circuit having adjustable PLL bandwidth |
Jan. 22, 2008 |
| 7317769 |
Bit stream conditioning circuit having adjustable input sensitivity |
Jan. 8, 2008 |
| 7260211 |
Method and circuit for adapting the impedance of an analog telecommunication connection |
Aug. 21, 2007 |
| 7254229 |
Method and apparatus for an active impedance feedback |
Aug. 7, 2007 |
| 7230989 |
System and method for processing digital visual interface communication data signals and display data channel communication signals over a transmission line |
Jun. 12, 2007 |
| 7218729 |
Subscriber line interface circuitry with current drivers for downstream voice and data signals |
May. 15, 2007 |
| 7215764 |
Current sensing echo cancellation device |
May. 8, 2007 |
| 7215762 |
Method of selecting impedance setting for loop start trunk line |
May. 8, 2007 |
| 7212627 |
Line interface with analog echo cancellation |
May. 1, 2007 |
| 7190769 |
Apparatus for controlling operation of a recording device with a telephone instrument |
Mar. 13, 2007 |
| 7180998 |
Regulator for impedance balance of a transmission wire pair |
Feb. 20, 2007 |
| 7180999 |
Subscriber line interface circuitry |
Feb. 20, 2007 |
| 7167555 |
Method for matching an adaptive hybrid to a line |
Jan. 23, 2007 |
| 7145943 |
XDSL system with improved impedance circuitry |
Dec. 5, 2006 |
| 7139392 |
Device and method for suppressing DSL signal echo induced by bridgetap |
Nov. 21, 2006 |
| 7113590 |
Method and apparatus for a differential feedback in an active impedence feedback circuit |
Sep. 26, 2006 |
| 7106854 |
XDSL system having selectable hybrid circuitry |
Sep. 12, 2006 |
| 7072464 |
Network communication device and hybrid circuit thereof |
Jul. 4, 2006 |
| 7072462 |
Estimation of DSL telephone loop capability using CAZAC sequence |
Jul. 4, 2006 |
| 7031456 |
Method, device and system for output impedance calibration that invariably maximizes hybrid performance |
Apr. 18, 2006 |
| 7023985 |
Circuit for electronically generating a call impedance |
Apr. 4, 2006 |
| 7010025 |
Circuit and method for an improved front end in duplex signal communication systems |
Mar. 7, 2006 |
| 6990191 |
Method and apparatus for handling voice and data signals |
Jan. 24, 2006 |
| 6985578 |
Low voltage broadband line driver |
Jan. 10, 2006 |
| 6970557 |
Cordless telephone-to-sound card interface adapter having a hybrid transformer circuit |
Nov. 29, 2005 |
| 6965670 |
Method for optimizing the transmission properties and the power loss of a high-voltage part which is integrated in a subscriber connection circuit for connecting a subscriber connection line |
Nov. 15, 2005 |
| 6963641 |
Method and apparatus for providing variable attenuation to data signals in an XDSL frequency range |
Nov. 8, 2005 |
| 6950512 |
Circuit arrangement for forming the termination of an analogous subscriber line |
Sep. 27, 2005 |
| 6947529 |
DSL compatible load coil |
Sep. 20, 2005 |
| 6940539 |
Variable cable length compensator for video imaging systems |
Sep. 6, 2005 |
| 6937719 |
Multiplexing and demultiplexing of narrowband and broadband services in a transmission connection |
Aug. 30, 2005 |
| 6925172 |
Line interface with gain feedback coupled matching impedance |
Aug. 2, 2005 |
| 6925171 |
Universal impedance matching network for the subscriber line integrated circuits |
Aug. 2, 2005 |
| 6920217 |
Method and apparatus for transient suppression in an integrated POTS/DSL line card |
Jul. 19, 2005 |
| 6904144 |
Impedance compensation in interfacing a modem to a telephone line |
Jun. 7, 2005 |
| 6895089 |
Pots splitter with line impedance matching |
May. 17, 2005 |
| 6853724 |
Cascade low-pass filter to improve xDSL band attenuation for POTS splitter |
Feb. 8, 2005 |
| 6842518 |
Frequency-dependent impedance synthesis for DSL interface circuits |
Jan. 11, 2005 |
| 6829353 |
Mechanism for preventing clipping of pulse metering signals in telephone line card channels |
Dec. 7, 2004 |
| 6826278 |
Central office interface techniques for digital subscriber lines |
Nov. 30, 2004 |
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