Patents Represented by Attorney, Agent or Law Firm Charles L. Warren
  • Patent number: 5329572
    Abstract: A telephone exchange provides dial-up switched connections for customers' broadband data terminal equipment (DTE). In response to data received over an associated narrowband channel, the exchange establishes a broadband transmission path to a broadband DTE associated with the narrowband channel. Upon receiving a number for the called party broadband DTE over the narrowband channel, the switch establishes an interoffice broadband channel for communications between the originating and destination DTE.
    Type: Grant
    Filed: September 24, 1992
    Date of Patent: July 12, 1994
    Assignee: AT&T Bell Laboratories
    Inventor: Gregory A. Martens
  • Patent number: 5309509
    Abstract: A graphical user interface workstation for use with a manager controller to control and implement changes to telephone sets of customer key telephone systems served by a telephone switching system. The workstation records high resolution graphical representations of each telephone set of a customer key telephone system and enables a customer user to select and display a recorded high resolution graphical representation of each telephone set of the customer user key telephone system. The workstation is interactive with the customer user and enables the customer user to selectively enter telephone lines, features and directory numbers changes into key button locations of a displayed telephone set graphical representation.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: May 3, 1994
    Assignee: AT&T Bell Laboratories
    Inventors: Sherri L. Cocklin, Thomas P. Orlofsky, Tanya T. van der Heyde
  • Patent number: 5291600
    Abstract: Upon a computer system crash, the operating system writes data such as stored in an in-core disk to an external nonvolatile disk drive. During a reboot of the system, volatile memory is cleared; and the location of the stored user data in the nonvolatile disk drive is determined. The location of the in-core disk in the nonvolatile disk drive is identified and the in-core disk's data is written back to memory, thereby preventing the loss of the user data due to a system crash.
    Type: Grant
    Filed: October 23, 1991
    Date of Patent: March 1, 1994
    Assignee: AT&T Bell Laboratories
    Inventors: Daniel E. Lutz, Jorge D. Penaranda
  • Patent number: 5278823
    Abstract: Testing according to this invention allows functions of a first network which is accessible by other networks to be tested without requiring a separate simulator of the other network or interaction with the other networks. This capability is generally accomplished by utilizing a gateway node in the first network to loop-back a query originated in the first network so that it appears as though it originated from another network. The first network then processes the query and originates a reply to the query which is forwarded to the gateway node. Again, the gateway node loops back the reply to the node in the first network which originated the query. Receipt of the loopback reply at the first node provides an indication that the first network can properly respond to queries originated in another network corresponding to the test query.
    Type: Grant
    Filed: March 27, 1992
    Date of Patent: January 11, 1994
    Assignee: AT&T Bell Laboratories
    Inventor: John M. Handel
  • Patent number: 5231633
    Abstract: A queueing and dequeueing mechanism for use in an integrated fast packet network, wherein fast packets from differing traffic types are multiplexed with one another through use of a weighted round-robin bandwidth allocation mechanism (517). Fast packets within a particular traffic type are selected for transmission through use of a head of line priority service (514), a packet discard mechanism (516), or both. The weighted round-robin bandwidth allocation mechanism functions, in part, based upon a credit counter for each queue group that represents a particular traffic type.
    Type: Grant
    Filed: July 11, 1990
    Date of Patent: July 27, 1993
    Assignee: Codex Corporation
    Inventors: Michael G. Hluchyj, Amit Bhargave, Nanying Yin
  • Patent number: 5187733
    Abstract: The present invention addresses an improved solution to the problem of cutover verification testing where a new digital switching system is to replace an existing switching system that serves at least a group of subscribers via continuous wire lines. It permits a plurality of existing wire lines to be concurrently connected to channel units associated with the new switching system without adversely impacting the existing service and automatic testing under the control of the new system.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: February 16, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Robert R. Beffel, Ellen R. Blood, Paul R. Bufkin, Bernard M. Dennison, Jerry G. Miller, James L. Turner
  • Patent number: 5163156
    Abstract: Control of communication by a plurality of devices, such as computer programs and terminals, via a computer is controlled by an arrangement referred to as a connector. The connector receives a request for communication defining the devices to the communication and, in response to the request, establishes a mapping table defining the source devices and destination devices to the connection. A source device stores data in connector memory and the connector reads the mapping table to determine the destination devices for the stored data. The connector then creates a linked list coupling structure between the stored data and the determined destination devices. The destination devices issue read commands to which the connector responds by reading the stored data in accordance with the coupling structure and providing that data to the requesting device.
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: November 10, 1992
    Assignee: AT&T Bell Laboratories
    Inventors: Wu-Hon F. Leung, Gottfried W. R. Luderer, Michael J. Morgan, Philip R. Roberts, Shi-Chuan Tu
  • Patent number: 5115429
    Abstract: This invention is suited for a packet network that carries bursty data. A mechanism is coupled to an edge node for coding bursty information into a digital format at either a first coding rate of a second coding rate which is less than the first rate. A mechanism senses traffic overload of one or more intermediate nodes carrying the bursty informaton. A mechanism which is responsive to the overload sensing mechanism causes the coding mechanism to switch from the first rate to the second rate while a traffic overload is sensed. Thus, network demand requirements are reduced and the overload will be alleviated.
    Type: Grant
    Filed: August 2, 1990
    Date of Patent: May 19, 1992
    Assignee: Codex Corporation
    Inventors: Michael G. Hluchyj, Nanying Yin
  • Patent number: 5097508
    Abstract: A method and apparatus is provided for determining the lag of a long term filter in a code excited linear prediction speech coder. An open loop lag is first determined using an autocorrelation function. The open loop lag is then utilized to generate a limited range over which a closed loop search is performed. The range for appropriate values includes lags that are harmonically related to the open loop lag as well as adjacent lags.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: March 17, 1992
    Assignee: Codex Corporation
    Inventors: Reinaldo A. Valenzuela Steude, Ronald G. Danisewicz
  • Patent number: 5092035
    Abstract: A first set of plated-through holes in the printed circuit board (PCB) are covered by a protective solder mask on the solder side of the PCB while a second set of plated-through holes are exposed. Electrical components are disposed on the component side with leads inserted in the second set of holes. Solder is prevented from flowing into the first set of holes during wave soldering by the mask covering. Conductive pins designed for press fitting into the first set of holes are inserted therethrough to define connecting pins on each side of the PCB following wave soldering. This permits both a wave soldering and press fit operation to be accommodated.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: March 3, 1992
    Assignee: Codex Corporation
    Inventors: T. Blane McMichen, Kerry J. McMullen, John A. Sudanowicz, III
  • Patent number: 5072448
    Abstract: Errors in a predetermined digital sequence are detected by utilizing a detector which includes memory elements such as a series shift register, and logic gates for detecting a predetermined subsequence. Errors are detected by comparing each bit in the data stream with the output of the memory. Logic gates inhibit the detection of an error in response to the subsequence detection.
    Type: Grant
    Filed: November 2, 1989
    Date of Patent: December 10, 1991
    Assignee: Universal Data Systems, Inc.
    Inventors: Keith E. Atwell, Harold A. Vaghy
  • Patent number: 5053717
    Abstract: An improved multilevel FSK demodulator, according to the invention, is provided that down-converts the IF frequency back to baseband quadrature via dual mixers. The improved multilevel FSK demodulator uses controllable time-delay in the demodulation process. This method requires a phase difference between 2 modulated signals to produce a maximum demodulated output amplitude at the maximum frequency deviation. Since the IF frequencies have been down-converted back to baseband quadrature, these 2 signals are only "out of phase" by an amount .DELTA.t that is equal to A further aspect of this invention addresses minimizing the DC offset from the demodulator by providing a feedback signal which controls the amount of delay provided to one of the quadrature signals.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: October 1, 1991
    Assignee: Motorola, Inc.
    Inventors: Gary D. Schulz, Dennis E. Burke
  • Patent number: 5027381
    Abstract: An improved process handles asynchronous data in which certain stop bits have been deleted or extra stop bits added to accommodate speed differences between a data source and the asynchronous data stream rate. A second asynchronous data stream is generated based upon said first data stream. Upon detecting a missing stop bit, a shortened stop bit is generated in the second data stream and a predetermined number of subsequent stop bits are also shortened to achieve synchronization with the first data stream. In a preferred embodiment, the receipt of an extra stop bit in the first data stream while shortened stop bits are being generated results in the extra stop bit not being generated in the second data stream and a corresponding flag set. If another missing stop bit occurs while shortened stop bits are being generated and if the flag is set, a shortened stop bit is inserted and the flag is reset.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: June 25, 1991
    Assignee: Motorola, Inc.
    Inventor: Kevin B. Theobald
  • Patent number: 5023937
    Abstract: A linear power amplifier is included in a RF transmitter. A mechanism is provided for generating a predistorted input signal to the PA so that nonlinear phase and amplitude characteristics of the PA will be compensated. Another means is provided for generating a feedback signal to the predistortion generating mechanism so that the feedback signal is based on the output of the PA when the predistortion circuit is locked and is based upon the input signal to the PA when the predistortion generating circuit is unlocked. Undesired emissions from the power amplifier are inhibited when the predistortion mechanism is unlocked.
    Type: Grant
    Filed: May 9, 1989
    Date of Patent: June 11, 1991
    Assignee: Motorola, Inc.
    Inventor: George F. Opas
  • Patent number: 4999744
    Abstract: This ejector mechanism supplies a force to remove an assembly of printed circuit boards (PCB's) from an enclosure. Each PCB in the assembly is electrically connected by a projecting rear portion of the PCB which engages a multiple contact connector attached to the enclosure. The friction associated with such engagement resists sliding the PCB assembly to disengage the connector. In an embodiment, a U-shaped lever is pivotally mounted to the assembly and applies a distributed force through each leg which is substantially adjacent each PCB. This provides force application substantially in the place of each PCB, thereby maximizing the desired force and minimizing undesired torque on each PCB.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: March 12, 1991
    Assignee: Universal Data Systems, Inc.
    Inventor: Lowel E. Blankenship
  • Patent number: 4985926
    Abstract: An improved bimorph piezoelectric transducer provides higher input impedance and allows operation at higher operating voltages. First and second piezoelectric elements have opposing electrode patterns which define a plurality of capacitors connected in series. This allows such transducers to be directly connected to high voltage audio distribution systems without the need for an impedance matching circuit.
    Type: Grant
    Filed: February 29, 1988
    Date of Patent: January 15, 1991
    Assignee: Motorola, Inc.
    Inventor: Richard G. Foster
  • Patent number: 4970715
    Abstract: A modem capable of simultaneously transmitting and receiving data signals over a single communication channel with a remote modem includes a transmitter for converting TX digital data into analog signals for transmission over the channel and a receiver for converting received analog signals into RX digital data. A mechanism identifies a remote echo returning to the modem corresponding to previously transmitted TX digital data. The identifiying mechanism is capable of identifiying a echo originating intermediate between the modem and the remote modem. Another mechanism substantially cancels the identified remote echo. The present invention also encompasses the method of identification and cancellation of remote echos. In addition, remote echo cancellation signals are not combined with received signals until local echo has been substantially cancelled.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: November 13, 1990
    Assignee: Universal Data Systems, Inc.
    Inventor: Dennis B. McMahan
  • Patent number: 4969144
    Abstract: A passband echo canceller achieves improved performance by providing a signal having a substantially uniform power spectral density to an adaptive echo canceller; the improved input signal is substantially uniform from approximately zero hertz to one half the operating or sample frequency of the echo canceller. This signal may comprise that range of frequencies occupied by the transmitted spectrum with added out of band noise.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: November 6, 1990
    Assignee: Universal Data Systems, Inc.
    Inventors: Steven R. Blackwell, Steven E. Turner, Michael D. Turner, Jerry D. Moore
  • Patent number: 4956852
    Abstract: A method for remotely configuring a modem in a communication system is described herein. Specifically, the method allows a modem user the ability to modify or view the options of a remote modem by placing the remote modem first into a test mode. The method, following the execution of the test mode, provides some security through the use of a security code which is programmable by the remote user. The remote modem is then placed into a reconfiguration mode, after which the local modem transmit commands to the remote modem using a bi-sync protocol to ensure accurate reception of commands and responses. The process of remote configuration is terminated by exiting the reconfiguration and test modes.
    Type: Grant
    Filed: August 30, 1988
    Date of Patent: September 11, 1990
    Assignee: Universal Data Systems, Inc.
    Inventor: Dean Y. Hodge
  • Patent number: D321343
    Type: Grant
    Filed: December 22, 1989
    Date of Patent: November 5, 1991
    Assignee: Codex Corporation
    Inventors: David L. Feer, Daniel L. Williams