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Class Information
Number: 379/345
Name: Telephonic communications > Repeater (e.g., voice frequency) > Component processes bidirectional signals > Including two-to-four wire conversion or hybrid circuit
Description: Subject matter including a component for coupling two physically separate line pairs each conducting a signal in opposite directions to a single two-wire line carrying signals in opposite directions.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8401177 Combined sidetone and hybrid balance Mar. 19, 2013
8385538 Method, system, and apparatus for a differential transformer-free hybrid circuit Feb. 26, 2013
7738653 Method for selecting impedance setting for loop start trunk line Jun. 15, 2010
7596112 Method and apparatus for rate compatible dirty paper coding Sep. 29, 2009
7486788 Transceiver with integrated hybrid circuit Feb. 3, 2009
7386119 Filtered transmit cancellation in a full-duplex modem data access arrangement (DAA) Jun. 10, 2008
7110528 Amplifier for unshielded twisted pair wire signals Sep. 19, 2006
7027589 Single-ended loop test circuitry in a central office DSL modem Apr. 11, 2006
7010025 Circuit and method for an improved front end in duplex signal communication systems Mar. 7, 2006
6980819 Radio communication system, and apparatus, method, and computer program for said radio communication system Dec. 27, 2005
6961421 Echo analysis for identification of hybrid induced echo in a communication link Nov. 1, 2005
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
6751202 Filtered transmit cancellation in a full-duplex modem data access arrangement (DAA) Jun. 15, 2004
6731752 Method and circuit for echo-cancellation in two-way communications May. 4, 2004
6421376 Methods of using digital modem identification information Jul. 16, 2002
6205218 Extended feedback circuit for impedance matching and voltage isolation Mar. 20, 2001
6185293 Signal matching apparatus for exchanging signals between an analog switching system and a digital switching system Feb. 6, 2001
6154536 Order wire accommodation system for interoffice communications Nov. 28, 2000
5974137 AGC amplifier for two-wire line conditioner Oct. 26, 1999
5963638 Adjustable hybrid having improved biasing configuration Oct. 5, 1999
5912964 Adaptive telephone handset interface Jun. 15, 1999
5887050 Repeater apparatus having isolation circuit Mar. 23, 1999
5757906 Method of canceling echoes and echo canceler May. 26, 1998
5721772 Subband acoustic echo canceller Feb. 24, 1998
5652712 Method and apparatus for calibration of digital test equipment Jul. 29, 1997
5602912 Telephone hybrid circuit Feb. 11, 1997
5546421 Self compensating spread-spectrum hybrid Aug. 13, 1996
5541990 Compensated hybrid Jul. 30, 1996
5506900 Temperature compensation for trans-hybrid loss in a miniaturized data access arrangement Apr. 9, 1996
5504811 Enhanced line powered amplifier Apr. 2, 1996
5500892 Echo canceller Mar. 19, 1996
5497417 Switching device for transmitting telecommunication signals Mar. 5, 1996
5479504 Low voltage balanced hybrid circuit with operational amplifiers Dec. 26, 1995
5461661 Line disconnection detection circuit for echo-cancelling transceivers Oct. 24, 1995
5457743 Metallic channel unit network Oct. 10, 1995
5422948 Subscriber line interface for improving the frequency characteristics of the transmitted and received signals Jun. 6, 1995
5414766 Process and device for adaptive digital cancellation of the echo generated in time-varying telephone connections May. 9, 1995
5402485 Two-wire termination impedance generation circuit of subscriber circuit Mar. 28, 1995
5307405 Network echo canceller Apr. 26, 1994
5305379 Semiconductor integrated device Apr. 19, 1994
5289539 Echo canceller using impulse response estimating method Feb. 22, 1994
5282157 Input impedance derived from a transfer network Jan. 25, 1994
5274705 Nonlinear processor for an echo canceller and method Dec. 28, 1993
5260995 Electric power circuit for telephone set use Nov. 9, 1993
5251257 2-wire/3-wire converting apparatus Oct. 5, 1993
5245654 Solid state isolation device using opto-isolators Sep. 14, 1993
5228081 Ringing signal control circuit for an enhanced subscriber line interface Jul. 13, 1993
5189697 Line interface circuit Feb. 23, 1993
5175763 Two-wire/four-wire converter Dec. 29, 1992

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