| Patent Number |
Title Of Patent |
Date Issued |
| 7529229 |
Converged home gateway |
May 5, 2009 |
| A local area network connected to an infrastructure access device that provides the home LAN with access to voice, data and television services. The infrastructure access device includes a gateway to voice over Internet Protocol services, an interface to a data network for data acces |
| 7519168 |
Host computer digital signal processing system for communicating over voice-grade telephone chan |
April 14, 2009 |
| A conventional computer is coupled to an analog telephone transmission link by means of an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which exec |
| 7483528 |
Loop extender with selectable line termination and equalization |
January 27, 2009 |
| In accordance with the present invention, a loop extender for improving the transmission of digital subscriber line (DSL) signals over a local loop is disclosed. The loop extender includes selectable line termination and equalization (SLTE) DSL amplification circuitry capacitively couple |
| 7194023 |
Loop extender with communications, control, and diagnostics |
March 20, 2007 |
| In accordance with the present invention, a Digital Subscriber Line (DSL) network for improving the transmission of DSL signals over a local loop is disclosed. The DSL network includes a loop extender with communications, control, and diagnostic functionality, and a central office in |
| 7190716 |
Line powered loop extender with communications, control, and diagnostics |
March 13, 2007 |
| A Digital Subscriber Line (DSL) network for improving the transmission of DSL signals includes a plurality of local loops for transmission of upstream and downstream DSL signals, control signals, and Direct Current (DC) power, a plurality of loop extenders with communications, control, |
| 7072385 |
Load coil and DSL repeater including same |
July 4, 2006 |
| Systems and methods are disclosed for improving DSL performance, including ADSL and VDSL performance, over a local loop between a telephone company central office and a customer premises. In particular, a DSL repeater is coupled to the local loop and amplifies downstream and upstream DSL |
| 7068649 |
Extended bandwidth homePNA system compatible with homePNA 2.0 |
June 27, 2006 |
| An extended bandwidth HomePNA system uses a transmit spectrum having a greater bandwidth than the bandwidth specified by a HomePNA 2.0 communication standard. The extended bandwidth system of the invention provides for additional copies of a spectrum of a 2 Mbaud training signal for |
| 7061857 |
System and method for fault isolation for DSL loop extenders |
June 13, 2006 |
| A system and method are disclosed to implement fault detection in DSL loop extenders. The system of the invention includes a plurality of loop extenders coupled to a local loop, a loop extender (LE) test box coupled to the local loop, and fault detection circuitry coupled to each of the |
| 7023910 |
Dual-line DSL system and method |
April 4, 2006 |
| A dual-line DSL system comprises a central office and a customer premises coupled by at least two communication paths that together provide a single high-bandwidth channel. An ADSL transceiver unit-remote (ATU-R) at the customer premises is configured to reduce the effects of far end |
| 6977958 |
Differentially-driven loop extender |
December 20, 2005 |
| Systems and methods are disclosed for improving DSL performance, including ADSL and VDSL performance, over a local loop between a telephone company central office and a customer premises. In particular, a loop extender is coupled to the local loop and differentially amplifies downstream |
| 6965636 |
System and method for block error correction in packet-based digital communications |
November 15, 2005 |
| A system and method for efficiently correcting block errors in packet-based digital communications are provided whereby the ratio of redundant symbols/message symbols over the length of a data packet decreases in order to more efficiently use available bandwidth. The reduction of this |
| 6947529 |
DSL compatible load coil |
September 20, 2005 |
| A load coil is disposed along a local loop for conditioning POTS signals while permitting passage of higher frequency DSL signals with low attenuation. In one embodiment, the load coil includes a coupled inductor having multiple capacitive elements coupled thereto, the capacitive ele |
| 6885698 |
Efficient hardware implementation for signal reconstruction over multiple analog-to-digital, dig |
April 26, 2005 |
| Method and apparatus for providing an improved quality voice band channel equalization in telecommunication systems employing v.90 transmission standard in which PCM modem signals passing through a digital-to-analog and analog-to-digital conversion processes between a central office swit |
| 6874096 |
Apparatus and method for detecting packet arrival time |
March 29, 2005 |
| A detector for detecting packet arrival time for packets received by a Home Phoneline Network Alliance (HPNA) receiver. The detector correlates received preamble symbols with stored preamble symbols and generates an estimation of the packet arrival time when the entire transmitted preamb |
| 6853637 |
Converged home gateway |
February 8, 2005 |
| A local area network connected to an infrastructure access device that provides the home LAN with access to voice, data and television services. The infrastructure access device includes a gateway to voice over Internet Protocol services, an interface to a data network for data access, a |
| 6693997 |
Host computer digital signal processing system for communicating over voice-grade telephone chan |
February 17, 2004 |
| A conventional computer is coupled to an analog telephone transmission link by means of an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which executes |
| 6690666 |
Packet modulation for DSL |
February 10, 2004 |
| The subject invention defines the details of packet based DSL modulation. The invention claims a method for minimizing crosstalk generation by specifying a duty cycle for bursted carrier data traffic and a method of providing opportunistic echo canceller training. In this way the present |
| 6636519 |
Network access method and network access server therefor |
October 21, 2003 |
| Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call |
| 6542028 |
System and method for efficient demodulation and filtering of a received signal |
April 1, 2003 |
| An efficient demodulation and low pass filter structure comprises a shift-add-negate structure that effectively multiplies each received sample by a combined demodulation and filter coefficient, and an accumulator that accumulates the products. Low pass filter coefficients are select |
| 6529549 |
System and method for an equalizer-based symbol timing loop |
March 4, 2003 |
| An equalizer based symbol timing loop system incorporates existing receiver architecture to modify an input sample stream to match a transmitter's symbol rate. The system includes a phase detector that identifies a center tap in a linear equalizer in the receiver and then captures the va |
| 6507608 |
Multi-line ADSL modulation |
January 14, 2003 |
| A system and method are disclosed for transmitting data over multiple twisted pairs and receiving the data at a single receiver. In one embodiment, data is transmitted over an additional channel existing as the difference between the average voltages of two twisted pairs. |
| 6285709 |
Error filtering in a hybrid equalizer system |
September 4, 2001 |
| Apparatus and methods of compensating for distortions introduced in communication signals received over a telephone network. An adaptive linear equalizer (LE) pre-filter is used for filtering incoming sampled communication signals received via the telephone network transmission mediu |
| 6255967 |
Frame-based spectral shaping method and apparatus |
July 3, 2001 |
| An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a |
| 6115395 |
Method of detecting network impairments for high speed data communication over conventional subs |
September 5, 2000 |
| A method of detecting the presence of signal impairments that introduce distortion in one or more time slots of a communication link by comparing a received training sequence of signal points with hypothetical received signal points, where the hypothetical points are predistorted version |
| 6111920 |
Method and system for timing recovery in a baud-rate sampled data stream |
August 29, 2000 |
| Decision-based timing information extraction from a baud-rate sampled digital transmission system. Samples are interpolated from a data sample stream to obtain samples shifted forward and backward in time. A timing metric is applied to the forward and backward shifted sample stream to |
| 6097794 |
Host computer digital signal processing system for communicating over voice-grade telephone chan |
August 1, 2000 |
| A conventional computer is coupled to an analog telephone transmission link by means of an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which executes |
| 6094422 |
Echo canceller touch-up period in an echo-cancelling modem |
July 25, 2000 |
| Abbreviated subsystem retraining in a local modem including an information processor having a plurality of subsystems configurable with the information processor for data communications over a first transmission medium, e.g., an analog local loop of a public telephone network. The lo |
| 6084883 |
Efficient data transmission over digital telephone networks using multiple modulus conversion |
July 4, 2000 |
| A method of encoding data into a digital sequence to be transmitted over the DTN so as to cause the DTN's codec to generate a multiple modulus M-ary signal in a manner that will facilitate efficient data transmission and recovery (decoding) by the distant end receiver, even in the presen |
| 6034993 |
Method and apparatus for adaptively equalizing a signal received from a remote transmitter |
March 7, 2000 |
| An apparatus and method for adaptively equalizing a signal received from a remote transmitter. The equalizer includes a filter having an output and a decision circuit coupled to the filter output. In addition, the equalizer has a reference coupled to the decision circuit. The reference i |
| 5999109 |
Frame-based spectral shaping method and apparatus |
December 7, 1999 |
| An improved DC compensation method for use in conjunction with telephony signalling. The method includes defining a frame that includes at least two n-bit codewords. An unsigned codeword is then identified within the frame by applying a rule to the codewords in the defined frame. Next, a |
| 5912888 |
Digital network access server |
June 15, 1999 |
| Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call |
| 5892757 |
Asymmetric duplex modem utilizing narrow band echo cancellation |
April 6, 1999 |
| A full-duplex modem having improved transmission speeds over voice grade telephone circuits that extends the concepts of asymmetric transmission to include echo cancellation techniques. The preferred modem has a high speed forward channel and an overlapping low speed back channel and is |
| 5872836 |
Host computer digital signal processing system for communicating over voice-grade telephone chan |
February 16, 1999 |
| A conventional computer is coupled to an analog telephone transmission link by means of an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which executes |
| 5793821 |
Timing Recovery using group delay compensation |
August 11, 1998 |
| An electronic transmit/receive device employs an equalized envelope derived timing system to compensate for differential time delay occurring at upper and lower bandedges of the received signal. The received signal is split into a complex signal and the envelope derived timing system is |
| 5724413 |
Host computer digital signal processing system for communicating over voice-grade telephone chan |
March 3, 1998 |
| A conventional computer is coupled to an analog telephone transmission link by an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which executes programs |
| 5705949 |
Compensation method for I/Q channel imbalance errors |
January 6, 1998 |
| A method in which correctable I/Q imbalance errors in a complex receiver can be detected and compensated for digitally without the use of special calibration signals. Differential D.C. offset errors are compensated by averaging the incoming I.sub.d and Q.sub.d digital signals and subtrac |
| 5646983 |
Host computer digital signal processing system for communicating over voice-grade telephone chan |
July 8, 1997 |
| A conventional computer is coupled to an analog telephone transmission link by an analog/digital conversion interface adapter. Modem transmission is accomplished by performing the modulation and demodulation functions digitally in the computer's existing processor which executes programs |
| 5579305 |
Asymmetric duplex modem utilizing narrow band echo cancellation |
November 26, 1996 |
| A full-duplex modem having improved transmission speeds over voice grade telephone circuits that extends the concepts of asymmetric transmission to include echo cancellation techniques. The preferred modem has a high speed forward channel and an overlapping low speed back channel and is |
| 5528595 |
Modem input/output signal processing techniques |
June 18, 1996 |
| Apparatus and method for enabling bilateral transmission of digital data between a local area network and telephone company networks employing both analog and digital telephone lines. A modem modulates signals responsive to signals from a local area network representing an outgoing call |
