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Class Information
Number: 379/402
Name: Telephonic communications > Subscriber line or transmission line interface > Hybrid circuit
Description: Subject matter including a two-wire to four-wire converter.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7542562 |
Method for automatically adapting levels of signals exchanged in a communication network |
Jun. 2, 2009 |
| 7486788 |
Transceiver with integrated hybrid circuit |
Feb. 3, 2009 |
| 7460662 |
Isolation of transmit and receive signals in full-duplex communication systems |
Dec. 2, 2008 |
| 7457405 |
Enhanced low pass filter |
Nov. 25, 2008 |
| 7450715 |
Transceiver for bidirectional frequency division multiplexed transmission |
Nov. 11, 2008 |
| 7397914 |
Multiple path hybrid for subscriber line services |
Jul. 8, 2008 |
| 7386119 |
Filtered transmit cancellation in a full-duplex modem data access arrangement (DAA) |
Jun. 10, 2008 |
| 7330703 |
Transceiver for bidirectional frequency division multiplexed transmission |
Feb. 12, 2008 |
| 7330545 |
Dual transformer hybrid system and method |
Feb. 12, 2008 |
| 7327298 |
Gigabit ethernet line driver and hybrid architecture |
Feb. 5, 2008 |
| 7233649 |
Faster modem method and apparatus |
Jun. 19, 2007 |
| 7221754 |
Switchable hybrid design for asymmetric digital subscriber line |
May. 22, 2007 |
| 7212627 |
Line interface with analog echo cancellation |
May. 1, 2007 |
| 7149246 |
Method and apparatus for reducing oscillator pull in a CMOS wireless transceiver integrated circuit |
Dec. 12, 2006 |
| 7139393 |
Environmental noise level estimation apparatus, a communication apparatus, a data terminal apparatus, and a method of estimating an environmental noise level |
Nov. 21, 2006 |
| 7127062 |
Hybrid circuit for a broadband modem |
Oct. 24, 2006 |
| 7123897 |
Directional receiver coupling arrangement with frequency selectivity and gain control for DSL |
Oct. 17, 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 |
| 7103691 |
Method, system and device for a processor to access devices of different speeds using a standard memory bus |
Sep. 5, 2006 |
| 7072464 |
Network communication device and hybrid circuit thereof |
Jul. 4, 2006 |
| 7068778 |
Integrated line inductor and line feed resistor |
Jun. 27, 2006 |
| 7054279 |
Method and apparatus for optimizing signal transformation in a frame-based communications network |
May. 30, 2006 |
| 7050574 |
Telephone line interface circuit and method |
May. 23, 2006 |
| 7046983 |
Integral board and module for power over LAN |
May. 16, 2006 |
| 7031456 |
Method, device and system for output impedance calibration that invariably maximizes hybrid performance |
Apr. 18, 2006 |
| 7027589 |
Single-ended loop test circuitry in a central office DSL modem |
Apr. 11, 2006 |
| 7020276 |
Frequency sensitive inductance device in POTS splitter design |
Mar. 28, 2006 |
| 7006625 |
Cordless telephone-to-sound card interface adapter with hybrid transformer and control circuit |
Feb. 28, 2006 |
| 6993125 |
Variable sidetone system for reducing amplitude induced distortion |
Jan. 31, 2006 |
| 6978013 |
Device for establishing a galvanically separate connection between a telephone line and a signal processing unit at the subscriber end of the telephone line |
Dec. 20, 2005 |
| 6973183 |
Method and apparatus for dynamically matching impedance |
Dec. 6, 2005 |
| 6973182 |
Differential echo cancellation receiver with dynamic cancellation of excess DC output current |
Dec. 6, 2005 |
| 6956944 |
Method and apparatus for compensating for an echo signal component in telecommunication systems |
Oct. 18, 2005 |
| 6944213 |
Adaptive hybrid for a digital subscriber line analog front end |
Sep. 13, 2005 |
| 6931122 |
Single transformer hybrid system and method |
Aug. 16, 2005 |
| 6917682 |
Method and device for echo cancelling |
Jul. 12, 2005 |
| 6909781 |
DSL line tester |
Jun. 21, 2005 |
| 6898280 |
Line card and method for supporting pots, asymmetric DSL and symmetric DSL services |
May. 24, 2005 |
| 6895089 |
Pots splitter with line impedance matching |
May. 17, 2005 |
| 6895040 |
Architecture for a digital subscriber line analog front end |
May. 17, 2005 |
| 6888939 |
Circuit for joint transmitting voice and data over a telephone line |
May. 3, 2005 |
| 6870928 |
Line interface, apparatus and method for coupling transceiver and transmission line |
Mar. 22, 2005 |
| 6842517 |
Meter pulse filtering circuit for analog modems |
Jan. 11, 2005 |
| 6823066 |
Digital access arrangement circuitry and method having current ramping control of the hookswitch |
Nov. 23, 2004 |
| 6804349 |
Hybrid transceiver circuit |
Oct. 12, 2004 |
| 6801621 |
Circuit and method for active termination of a transmission line interface |
Oct. 5, 2004 |
| 6792105 |
Current-mode differential active hybrid circuit |
Sep. 14, 2004 |
| 6771770 |
Hybrid circuit for a broadband modem |
Aug. 3, 2004 |
| 6763109 |
Copper based interface system and regulated power source |
Jul. 13, 2004 |
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