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).
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Patent number: 4406005Abstract: 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: GrantFiled: December 23, 1980Date of Patent: September 20, 1983Assignee: GTE Automatic Electric Labs Inc.Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelt
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Patent number: 4402077Abstract: 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: GrantFiled: December 23, 1980Date of Patent: August 30, 1983Assignee: GTE Automatic Electric Labs Inc.Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
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Patent number: 4399534Abstract: 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: GrantFiled: December 23, 1980Date of Patent: August 16, 1983Assignee: GTE Automatic Electric Labs Inc.Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
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Patent number: 4399533Abstract: 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: GrantFiled: December 23, 1980Date of Patent: August 16, 1983Assignee: GTE Automatic Electric Labs Inc.Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
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Patent number: 4399369Abstract: 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: GrantFiled: December 23, 1980Date of Patent: August 16, 1983Assignee: GTE Automatic Electric Labs Inc.Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
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Patent number: 4392223Abstract: 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: GrantFiled: December 23, 1980Date of Patent: July 5, 1983Assignee: GTE Automatic Electric Laboratories, Inc.Inventors: Nathaniel Simmons, Stig Magnusson, Sergio E. Puccini, Donald W. McLaughlin, David J. Stelte
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Patent number: 4308472Abstract: 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: GrantFiled: December 3, 1979Date of Patent: December 29, 1981Assignee: GTE Automatic Electric Labs Inc.Inventor: Donald W. McLaughlin
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Patent number: 4274155Abstract: 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: GrantFiled: August 6, 1979Date of Patent: June 16, 1981Assignee: GTE Automatic Electric Laboratories Inc.Inventors: Tim Funderburk, Donald W. McLaughlin
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Patent number: 4257120Abstract: 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: GrantFiled: August 6, 1979Date of Patent: March 17, 1981Assignee: GTE Automatic Electric Laboratories IncorporatedInventors: Tim Funderburk, Donald W. McLaughlin
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Patent number: 4254497Abstract: 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: GrantFiled: August 6, 1979Date of Patent: March 3, 1981Assignee: GTE Automatic Electric Laboratories, Inc.Inventors: Tim Funderburk, Donald W. McLaughlin
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Patent number: 4201894Abstract: 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: GrantFiled: September 28, 1978Date of Patent: May 6, 1980Assignee: GTE Automatic Electric Laboratories IncorporatedInventor: Donald W. McLaughlin
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Patent number: 4201893Abstract: 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: GrantFiled: September 28, 1978Date of Patent: May 6, 1980Assignee: GTE Automatic Electric Laboratories IncorporatedInventor: Donald W. McLaughlin
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Digital trunk supervisory decoder multiplexor for ground start or E&M signalling on a common T1 span
Patent number: 4191857Abstract: 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: GrantFiled: September 28, 1978Date of Patent: March 4, 1980Assignee: GTE Automatic Electric Laboratories IncorporatedInventors: Donald W. McLaughlin, Julius Jusinskas, Jr. -
Patent number: 4175215Abstract: 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: GrantFiled: December 5, 1977Date of Patent: November 20, 1979Assignee: GTE Automatic Electric Laboratories IncorporatedInventors: Donald W. McLaughlin, Gerald F. Fetterer
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Patent number: 4126766Abstract: 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: GrantFiled: December 5, 1977Date of Patent: November 21, 1978Assignee: GTE Automatic Electric Laboratories IncorporatedInventors: Donald W. McLaughlin, Gerald F. Fetterer
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Patent number: 4054755Abstract: 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: GrantFiled: October 14, 1976Date of Patent: October 18, 1977Assignee: GTE Automatic Electric Laboratories IncorporatedInventors: David Quon Lee, Donald W. McLaughlin
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Patent number: 4022981Abstract: 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: GrantFiled: July 28, 1976Date of Patent: May 10, 1977Assignee: GTE Automatic Electric Laboratories IncorporatedInventors: Donald W. McLaughlin, David Q. Lee
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Patent number: 4007338Abstract: 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: GrantFiled: September 18, 1975Date of Patent: February 8, 1977Assignee: GTE Automatic Electric Laboratories IncorporatedInventor: Donald W. McLaughlin
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Patent number: 3931474Abstract: 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: GrantFiled: December 30, 1974Date of Patent: January 6, 1976Assignee: GTE Automatic Electric Laboratories IncorporatedInventors: Donald W. McLaughlin, David Q. Lee