Patents by Inventor Dale M. Walsh
Dale M. Walsh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 7529229Abstract: 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 router to multiplex signals from the gateways and the data network and a Digital Subscriber Line (DSL) transceiver connected to a gateway device in the customer premises. The gateway device includes a DSL transceiver to communicate over the DSL connecting it to the infrastructure access device to provide the home LAN with high performance communications services without the use of POTS. The DSL transceiver may communicate using a switched carrier modulation scheme to conserve power and reduce crosstalk.Type: GrantFiled: May 17, 2004Date of Patent: May 5, 2009Assignee: 3Com CorporationInventors: Andrew L. Norrell, Dale M. Walsh, Don Bellenger
-
Patent number: 6853637Abstract: 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 router to multiplex signals from the gateways and the data network and a Digital Subscriber Line (DSL) transceiver connected to a gateway device in the customer premises. The gateway device includes a DSL transceiver to communicate over the DSL connecting it to the infrastructure access device to provide the home LAN with high performance communications services without the use of POTS. The DSL transceiver may communicate using a switched carrier modulation scheme to conserve power and reduce crosstalk.Type: GrantFiled: May 29, 1999Date of Patent: February 8, 2005Assignee: 3Com CorporationInventors: Andrew L. Norrell, Dale M. Walsh, Don Bellenger
-
Patent number: 6690666Abstract: 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 invention minimizes power and interference while maximizing the peak capacity of a transceiver used in ADSL communication systems.Type: GrantFiled: May 29, 1999Date of Patent: February 10, 2004Assignee: 3Com CorporationInventors: Andrew L. Norrell, Dale M. Walsh, William Kurt Dobson, Richard G. C. Williams, John Rosenlof
-
Patent number: 6636519Abstract: 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 to form digital telephone signals suitable for transmission by a telephone line and suitable for demodulation by receiving analog modems. A circuit switched time division multiplex bus transmits the digital telephone signals to the telephone line. The modem also demodulates incoming digital telephone signals to form digital network bus signals divided into packets. A packet bus transmits the digital network bus signals to a network interface which processes the signals and transmits them to the local area network.Type: GrantFiled: June 14, 1999Date of Patent: October 21, 2003Assignee: UT Starcom, Inc.Inventors: Dale M. Walsh, Andrew L. Norrell, Donald C. Balton, Terrel L. Jones, Marc S. Baum, Robert C. Suffern, Christopher R. Hansen, Jeffrey E. Herman, Thanh Q. Ngo, Daniel L. Schoo, Gregory Warren Goodknight
-
Patent number: 6421388Abstract: A method and apparatus for determining the correct decision regions in a PCM communication receiver utilizing a public Digital Telephone Network (DTN). A receiver receives samples from an analog loop of the DTN and quantizes the samples according to a reference lattice. The reference lattice defines a set of decision levels representing the quantization level for each PCM codeword. The receiver sets the reference lattice by scaling the lattice to account for the characteristics of the communication channel, which typically includes distortions of the digital data resulting in nonlinear behavior of the channel. The scaling and re-scaling thus accounts for PCM codeword translations or other channel distortion.Type: GrantFiled: May 27, 1998Date of Patent: July 16, 2002Assignee: 3Com CorporationInventors: Vladimir Parizhsky, Dale M. Walsh, Vitali Vinokour
-
Patent number: 6034993Abstract: 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 includes a model of a non-linear characteristic of a remote transmitter. The method relates to adaptively equalizing a signal received from a remote transmitter. The method includes the step of receiving a signal corresponding to a predetermined reference level from the remote transmitter. Next, the received signal level is filtered to remove linear error terms. The next step of the method includes measuring a non-linear error term associated with the received and filtered signal. The measured non-linear error term may then be stored and used to make improved decisions on data signals transmitted from the remote transmitter.Type: GrantFiled: November 14, 1997Date of Patent: March 7, 2000Assignee: 3Com CorporationInventors: Andrew L. Norrell, Dale M. Walsh
-
Patent number: 5963622Abstract: A method for identifying that a data communications device is operable in a predetermined mode. The first step of the method provides for generating a frequency division modulation capabilities signal. The generated signal is limited to a predetermined frequency range. The method further provides for superimposing mode identification information upon the generated signal to form a modified signal. Like the generated signal, the modified signal falls within the predetermined range. The superimposed mode identification information may be applied by frequency modulating the generated signal.Type: GrantFiled: July 29, 1997Date of Patent: October 5, 1999Assignee: 3Com CorporationInventor: Dale M. Walsh
-
Patent number: 5912888Abstract: 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 to form digital telephone signals suitable for transmission by a telephone line and suitable for demodulation by receiving analog modems. A circuit switched time division multiplex bus transmits the digital telephone signals to the telephone line. The modem also demodulates incoming digital telephone signals to form digital network bus signals divided into packets. A packet bus transmits the digital network bus signals to a network interface which processes the signals and transmits them to the local area network.Type: GrantFiled: August 27, 1997Date of Patent: June 15, 1999Assignee: U.S. Robotics Access Corp.Inventors: Dale M. Walsh, Andrew L. Norrell, Donald C. Balton, Terrel L. Jones, Marc S. Baum, Robert C. Suffern, Christopher R. Hansen, Jeffrey E. Herman, Thanh Q. Ngo, Daniel L. Schoo, Gregory Warren Goodknight
-
Patent number: 5528595Abstract: 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 to form digital telephone signals suitable for transmission by a telephone line and suitable for demodulation by receiving analog modems. A circuit switched time division multiplex bus transmits the digital telephone signals to the telephone line. The modem also demodulates incoming digital telephone signals to form digital network bus signals divided into packets. A packet bus transmits the digital network bus signals to a network interface which processes the signals and transmits them to the local area network.Type: GrantFiled: November 14, 1995Date of Patent: June 18, 1996Assignee: U.S. Robotics, Inc.Inventors: Dale M. Walsh, Andrew L. Norrell, Donald C. Balton, Terrel L. Jones, Marc S. Baum, Robert C. Suffern, Christopher R. Hansen, Jeffery E. Herman, Thanh Q. Ngo
-
Patent number: 5515398Abstract: Techniques for generating a line probing signal. The probing signal is comprised of a plurality of different tones, where the tones have a predetermined phase relationship. The signal may be sent over a communication channel, such as a telephone line. By so using the line probing signal, the non-linearity of the electrical characteristics of the telephone line may be measured with increased accuracy.Type: GrantFiled: March 15, 1994Date of Patent: May 7, 1996Assignee: U.S. Robotics, Inc.Inventors: Dale M. Walsh, Vladimir Parizhsky
-
Patent number: 5008901Abstract: A modem for connecting data terminal equipment (DTE) to a remote DTE via a general switched telephone network or leased lines at data rates of 300, 1200 and 2400 bps using standard modulation techniques, and additonally providing virtual full duplex transmission capability at 9600 bps using trellis code modulation (TCM). The high-speed 9600 bps path is implemented by asymmetrical frequency division of the available bandwidth into a high speed, wideband forward channel (9600 bps) and a low speed, narrowband backchannel (300 bps). The high speed transmitting channel is assigned to that modem having the greatest data demand and the direction is dynamically reversed whenever the amount of data awaiting transmission over the low speed channel exceeds a predetermined maximum backlog, provided that a direction reversal has not taken place for at least a specified minimum interval during which use of the forward channel is guaranteed.Type: GrantFiled: October 29, 1987Date of Patent: April 16, 1991Assignee: U.S. Robotics, Inc.Inventors: Clifford H. Wallach, Robert C. Suffern, Dale M. Walsh
-
Patent number: 4890316Abstract: A modem for connecting data terminal equipment (DTE) to a remote DTE via a the general switched telephone network or leased lines at data rates of 300, 1200 and 2400 bps using standard modulation techniques, and additionally providing virtual full duplex transmission capability at 9600 bps using trellis code modulation (TCM). The high-speed 9600 bps path is implemented by asymmetrical frequency division of the available bandwidth into a high speed, wideband forward channel (9600 bps) and a low speed, narrowband backchannel (300 bps). The high speed transmitting channel is assigned to that modem having the greatest data demand and the direction is dynamically reversed whenever the amount of data awaiting transmission over the low speed channel exceeds a predetermined maximum backlog, provided that a direction reversal has not taken place for at least a specified minimum interval during which use of the forward channel is guaranteed.Type: GrantFiled: October 28, 1988Date of Patent: December 26, 1989Inventors: Dale M. Walsh, Clifford H. Wallach
-
Patent number: 4290139Abstract: Portions of an adaptive equalizer can be used for exact preamble synchronization by modifying the digital filter section to recognize pre-determined sequences of signals in the received signal. This may be accomplished by applying to the modifying means of the digital filter input signals which are proportional to the complex conjugate of the signals in the received signal. When the signals in the tapped delay line are aligned with this complex conjugate, the output of the summing means will be discernibly greater than otherwise. As a result, a threshold device can be used to recognize the exact baud time the preselected signals in the received signal are contained in the tapped delay line.Type: GrantFiled: December 22, 1978Date of Patent: September 15, 1981Assignee: General DataComm Industries, Inc.Inventor: Dale M. Walsh
-
Patent number: 4085449Abstract: A digital modem comprising a discrete analog/digital converter and digital processor for high-speed digital data transmission by means of analog signals over analog transmission facilities. The analog/digital converter comprises a transmitter section including a digital-to-analog converter and an analog matching interface, and a receiver section including an analog matching interface and analog-to-digital converter. The digital processor comprises a signal processor set, a processor control set and a multiplier/memory set capable of digital manipulation and computation of digitized data signals to accomplish the required encoding, filtering, modulation, demodulation, equalization, decoding and control function.Type: GrantFiled: November 26, 1976Date of Patent: April 18, 1978Assignee: Paradyne CorporationInventors: Dale M. Walsh, Karl I. Nordling
-
Patent number: 4021654Abstract: A MOS/LSI digital filter comprising multiplier circuitry with more than one serial multiplier section, accumulator circuitry with overflow correction and true sign logic, and coefficient circuitry is contained in special MOS/LSI devices.Type: GrantFiled: June 11, 1975Date of Patent: May 3, 1977Assignee: Paradyne, Inc.Inventors: Harvey H. Harris, Victor Lindberg, Dale M. Walsh