Patents by Inventor Donald W. McLaughlin

Donald W. McLaughlin 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: 4406005
    Abstract: A simplex time-space-time switching network is shown in which there is a crossover of voice information from one rail to another rail in a large digital switching system. The time control unit is divided into two rails both incoming and outgoing. Each rail multiplexes two 193 channel streams into one 386 channel stream of information. These two rails crossover in the originating time switching stage but remain segregated throughout the space switching stage and the terminating time switching stage.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: September 20, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelt
  • Patent number: 4402077
    Abstract: A duplex time-space-time switching network is shown in which there is a multiple crossover of voice information from one rail to another rail in a large digital switching system. The time and control unit is divided into two rails both incoming and outgoing. Each rail multiplexes two 193 channel streams into one 386 channel stream of information. These two rails crossover in the originating and terminating time switching stages but remain segregated throughout the space switching stage.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: August 30, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
  • Patent number: 4399534
    Abstract: A duplex time-space-time switching network is shown in which there is a crossover of voice information from one rail to another rail in a large digital switching system. The time and control unit is divided into two rails both incoming and outgoing. Each rail multiplexes two 193 channel streams into one 386 channel stream of information. These two rails crossover in the terminating time switching stage but remain segregated throughout the space switching stage and the terminating time switching stage.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: August 16, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
  • Patent number: 4399369
    Abstract: A duplex time-space-time switching network is shown in which there is a crossover of voice information from one rail to another rail in a large digital switching system. The time and control unit is divided into two rails both incoming and outgoing. Each rail multiplexes two 193 channel streams into one 386 channel stream of information. These two rails crossover in the originating time switching stage but remain segregated throughout the space switching stage and the terminating time switching stage.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: August 16, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
  • Patent number: 4399533
    Abstract: A time-space-time switching network is shown in which there is a crossover of voice information from one rail to another rail in a large digital switching system. The time and control unit is divided into two rails both incoming and outgoing. Each rail multiplexes two 193 channel streams into one 386 channel stream of information. These two rails crossover in the terminating time switching stage but remain segregated throughout the space switching stage and the originating time switching stage.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: August 16, 1983
    Assignee: GTE Automatic Electric Labs Inc.
    Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
  • Patent number: 4392223
    Abstract: A time-space-time switching network is shown in which there is a multiple crossover of voice information from one rail to another rail in a large digital switching system. The time and control unit is divided into two rails both incoming and outgoing. Each rail multiplexes two 193 channel streams into one 386 channel stream of information. These two rails crossover in either or both the originating and terminating time switching stages but remain segregated throughout the space switching stage.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: July 5, 1983
    Assignee: GTE Automatic Electric Laboratories, Inc.
    Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
  • Patent number: 4308472
    Abstract: An apparatus adapted to check for the continuous presence of an incoming clock pulse train comprising an exclusive OR gate, to the input of which are coupled the clock pulse train and a second train of clock pulses delayed by one half the period of the incoming clock pulse train. A third train of clock pulses delayed by three quarters of the clock period is utilized to strobe the OR gate output into a pair of flip-flops. If the two inputs to the OR gate are the same a fault exists and a flip-flop is set to indicate on which excursion the fault occurred.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: December 29, 1981
    Assignee: GTE Automatic Electric Labs Inc.
    Inventor: Donald W. McLaughlin
  • Patent number: 4274155
    Abstract: An improved conference circuit for use in a Pulse Code Modulation telephone switching system wherein a number of channels are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a voice level coding arrangement whereby the voice level comparisons used in the speaker selection process are facilitated, and with a multi-frame coded voice level summing arrangement whereby channel switching caused by spurious noise peaks is effectively eliminated.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: June 16, 1981
    Assignee: GTE Automatic Electric Laboratories Inc.
    Inventors: Tim Funderburk, Donald W. McLaughlin
  • Patent number: 4257120
    Abstract: An improved conference circuit for use in a Pulse Code Modulation telephone switching system wherein a number of channels are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a multi-frame voice level summing arrangement whereby spurious channel switching caused by noise peaks is effectively eliminated.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: March 17, 1981
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Tim Funderburk, Donald W. McLaughlin
  • Patent number: 4254497
    Abstract: An improved conference circuit for use in a Pulse Code Modulation telephone switching system wherein a number of channels are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a voice level coding arrangement whereby the voice level comparisons used in the speaker selection process are facilitated.
    Type: Grant
    Filed: August 6, 1979
    Date of Patent: March 3, 1981
    Assignee: GTE Automatic Electric Laboratories, Inc.
    Inventors: Tim Funderburk, Donald W. McLaughlin
  • Patent number: 4201894
    Abstract: A private automatic branch exchange employing time division switching of digital signals, with provision for interfacing a fixed format data channel source to the randomly assigned channel allocation of the exchange. This is accomplished via channel buffering and channel address conversion under control of the branch exchange clock system.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: May 6, 1980
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: Donald W. McLaughlin
  • Patent number: 4201893
    Abstract: Groups of analog trunks are shown connected to analog to digital converters. The converters are each assigned a time during which their associated trunks may access a common data bus to the pulse code time division switching system. Provision is made for the use of T1 carrier channels to utilize the times normally assigned for the analog trunks by the provision of a circuit that one excludes the other from accessing the bus.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: May 6, 1980
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: Donald W. McLaughlin
  • Patent number: 4191857
    Abstract: Digital Carrier Trunks connected via a supervisory decoding and multiplexing logic to an electronic digital PABX. The circuit is arranged to receive or transmit the supervisory signal in either the "Ground Start", E&M modes or a combination of both in either the D2 or D3 signalling format over a T1 carrier span without converting to the analog signal form.
    Type: Grant
    Filed: September 28, 1978
    Date of Patent: March 4, 1980
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, Julius Jusinskas, Jr.
  • Patent number: 4175215
    Abstract: An improved conference technique whereby a number of channels in a telephone switching system employing pulse code modulation for transmission purposes are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a continuous threshold to pass the primary signal and to exclude the reflection. It is only used in the selection process, and for conditions which do not provide the threshold being met, the previous speaker is retained.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: November 20, 1979
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, Gerald F. Fetterer
  • Patent number: 4126766
    Abstract: An improved conference technique whereby a number of channels in a telephone switching system employing pulse code modulation for transmission purposes are combined so that a number of subscribers may participate in a common telephone conversation. The conference circuit is provided with a continuous threshold to pass the primary signal and to exclude the reflection. It is only used in the selection process, and for conditions which do not provide the threshold being met, the previous speaker is retained.
    Type: Grant
    Filed: December 5, 1977
    Date of Patent: November 21, 1978
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, Gerald F. Fetterer
  • Patent number: 4054755
    Abstract: A method of providing a multi-port conference circuit for use in a telephone switching system employing pulse coded modulated signals for transmission and supervision. Samplings of coded information are employed as a source of conference data and comparison with the digital information contained therein is employed to choose the speaker in a conference group. Included circuitry provides compensation for degradation caused by speech clipping and noise.
    Type: Grant
    Filed: October 14, 1976
    Date of Patent: October 18, 1977
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: David Quon Lee, Donald W. McLaughlin
  • Patent number: 4022981
    Abstract: A method of providing a multi-port conference circuit for use in a telephone switching system employing pulse coded modulated signals for transmission and supervision. Samplings of coded information are employed as a source of conference data and comparison with the digital information contained therein is employed to choose the speaker in a conference group.
    Type: Grant
    Filed: July 28, 1976
    Date of Patent: May 10, 1977
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, David Q. Lee
  • Patent number: 4007338
    Abstract: Most PCM systems provide non-blocking switching, with a channel per each terminal equipment being provided. In other words, they are dedicated channel arrangements. The present invention relates to PCM system using a method and arrangement which is a condensation of the required channels provided to time division switching by distribution of the channels instead of the usual dedicated channel method. In this system, a channel memory is created and provided to provide for control of which terminal equipments are allotted which channels (on a per call basis).
    Type: Grant
    Filed: September 18, 1975
    Date of Patent: February 8, 1977
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventor: Donald W. McLaughlin
  • Patent number: 3931474
    Abstract: A precise tone injection circuit for injecting tone signals to a constant current junctor circuit in a two-wire balanced circuit. The tone injection circuit includes a pair of transistors operating as constant current sources feeding the respective ones of the two wires. A phase splitter amplifier couples a tone signal to the base electrodes of the transistors to change the current through their collector electrodes via the emitter circuits thereof at a rate and frequency of the tone signals at the base. Since a two-wire balanced circuit is used, and the injected signal currents to each wire are 180.degree. out-of-phase, in-phase signals, that is, noise and voltage fluctuations, are reduced or rejected.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: January 6, 1976
    Assignee: GTE Automatic Electric Laboratories Incorporated
    Inventors: Donald W. McLaughlin, David Q. Lee