Patents Examined by Robert L. Griffin
  • Patent number: 4905219
    Abstract: A three level network microprocessor based nodal architecture for a fiber optic local area network communication system is disclosed in which the processing responsibility for establishing a voice, video or data communication link between an initiating I/O device and a recipient I/O device and for subsequent two way data exchange between the initiating and recipient devices are shared between three levels of digital processing capability in such manner as to demand the least amount of time from the highest, most intelligent processing level common to all devices thereby making more efficient use of its processing capability as an overall supervisory processor. Each I/O device whether it be a digital terminal, computer or telephone set interfaces with a nodal system through a middle level of processor.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: February 27, 1990
    Assignee: Aetna Life Insurance Company
    Inventors: Paul Barr, Leon K. Woo
  • Patent number: 4905307
    Abstract: A synchyronous receiver with direct mixing comprising a phase detector and an amplitude demodulator is provided with a square-law envelope detector and means for making the envelope signal audible or visible for tuning purposes.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: February 27, 1990
    Assignee: Telefunken electronic GmbH
    Inventor: Georg Frank
  • Patent number: 4905309
    Abstract: An emission device includes a first electro optical converter for converting electrical energy from a supply source into optical energy. A second electrical converter is provided to convert the electrical energy into digital information which is converted into digital optical information by a second electro optical converter. A reception device includes two optoelectrical converters connected to the electro optical converters by an optical path, and an electrical power accumulator capable of storing said electric power delivered by said optoelectric converter. The power accumulator is capable of supplying the reception device with electric power.
    Type: Grant
    Filed: August 23, 1988
    Date of Patent: February 27, 1990
    Assignee: Aerospatiale Societe Nationale Industrielle
    Inventors: Jean-Michel Maisonneuve, Francis Lacan, Jean-Paul Domergue
  • Patent number: 4905225
    Abstract: Each entering and outgoing hybrid time multiplexed signal is made up of frames with fixed length time intervals each carrying a block of words that form either a packet or a channel, except the first time interval of each frame which contains a frame synchronization block. The multiplexed signal is applied to a packet time switch using a paragonal conversion, as in the switch described in European patent document EP No. 113 639. The switch is comprised of input and output rotation matrices, a packet buffer memory, and a channel buffer memory, a packet/channel discrimination memory, a packet label translation memory, a set of memory files for the addresses of the packets in the packet buffer memory, a read control memory for reading in the channel buffer memory, a time base and a control unit capable of changing the contents of the translation memory of the discrimination memory and of the read control memory in terms of the traffic to carry.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: February 27, 1990
    Inventors: Joel Francois, Jean-Paul Quinquis
  • Patent number: 4905232
    Abstract: In a system which includes a data transmitting device, a repeater, and a data receiving device, the repeater accumulating input data in packets from the transmitting device and retransmitting it to the receiving device, a memory structure for the data which includes a data buffer a receive queue having a plurality entries, each entry capable of storing the starting address of a packet in the data buffer in order of receipt, and a transmit queue for storing the starting addresses of packets for transmitting to said receiving device is provided in the repeater. In operation, only addresses are transferred from receive queue to transmit queue with the data remaining in the buffer. Preferably the buffer and queues are circular.
    Type: Grant
    Filed: August 13, 1987
    Date of Patent: February 27, 1990
    Assignee: Digital Equipment Corporation
    Inventor: Bruce E. Newman
  • Patent number: 4905255
    Abstract: In a receiver for receiving and decoding a baseband multilevel signal into a digital data signal, and A/D converter produces in addition to the decoded data bits a "soft" bit, which inherently indicates the error polarity of the baseband signal. The soft bits are binary added to the most significant data bits to produce a sum bit. The sum bits are integrated, and the integral is used in a feedback loop to control the baseband signal amplitiude.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: February 27, 1990
    Assignees: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventor: Farajollah Aalaei
  • Patent number: 4905226
    Abstract: The invention relates to a time division switching system which may transmit both voice and data signals. The data signals may be transmitted at a much higher speed than the voice signals, such as twice the speed, for example. To do this, the data signals are split into two time slots which are separately transmitted. Since the two time frames are so closely related, they must be transmitted within the same frame as a unit. This is done by a combination of two memory switches and control means for transmitting multi-element information. The two memory switches are used in an alternating sequence.
    Type: Grant
    Filed: April 28, 1988
    Date of Patent: February 27, 1990
    Assignee: NEC Corporation
    Inventor: Tsuneo Kobayashi
  • Patent number: 4905302
    Abstract: A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses a much higher digital signalling rate than is typically found in prior art systems, and uses a control channel to convey digital channel request and assignment messages between the central site and mobile transceivers. The mobile radio transceivers transmit channel requests on the control channel (if no response is received, the mobile retries during a retry time window which increases in duration in dependence on the number of retries). The mobile transceiver switches to a working channel in response to an assignment message received on the control channel. Subaudible digital signals transmitted on the control channel and on active working channels allow late entry, shifting to higher priority calls, and other advanced functions.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: February 27, 1990
    Assignee: General Electric Company
    Inventors: Jeffrey S. Childress, Marc A. Dissosway, Gerald M. Cooper, Houston H. Hughes, III
  • Patent number: 4905222
    Abstract: Line trunk groups coupled to a double central switching matrix by way of two PCM lines and including sub-switching matrix and group control units are allocated to one another in pairs. Prepared for stand-by service switch-over by the central switching matrix and the processor are subscriber and trunk lines within each line trunk group pair, which are connected to the sub-switching matrix of a first line trunk group and are switchable to that of a second line trunk group, such that their group control unit also assumes the control functions. The processor going into service with the stand-by switch-over is connected with the group control units of all first line trunk groups via its central switching matrix, while all switching service continues with those of all second line trunk groups. Connection data of all existing connections are stored in all group control units.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: February 27, 1990
    Assignee: Siemens Aktiengesellschaft
    Inventors: Helmut Seeger, Axel Leichum, Anthony Maher
  • Patent number: 4905228
    Abstract: A plurality of digital signals of one or more digital transmission bit rates are arranged to be combined by employing a unique common channel frame format. The channel frame format includes a plurality of data bit positions and a plurality of overhead bit positions. The number of data bit positions used is dependent on the particular incoming signal. Similarly, the number of frames generated during a specific common framing interval is dependent on the digital transmission bit rate of the particular signal. Specifically, the number of channel frames generated during the common channel frame interval is dependent on a number of equivalent so-called lowest transmission bit rate signals included in the particular signal being formatted. The overhead bits are distributed in the channel frame format.
    Type: Grant
    Filed: May 9, 1988
    Date of Patent: February 27, 1990
    Assignees: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Eric H. Angell, Thomas J. Aprille, Rong-Chin Fang, Byeong G. Lee, Jan-Dieter Spalink
  • Patent number: 4905259
    Abstract: A method of selecting at least one code word from a set of second data having at least one data group representing a set of first data having at least one data group including the steps of determining for one of the set of second data, all those data groups in the set of first data covered by the one of the set of second data, eliminating the covered data group from the set of first data, selecting as one of the at least one code word the one of the set of second data which covers the maximum number of data groups in the set of first data, and repeating the above steps until a given criteria is satisfied.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: February 27, 1990
    Inventor: Jerry S. Nardi
  • Patent number: 4905303
    Abstract: A converter to convert audio signal associated with commercial television transmissions for input into conventional AM/FM automobile receivers so as to facilitate listening to the audio portions of telecasts on conventional radios.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: February 27, 1990
    Inventors: John L. Johnson, Jr., Robert J. Pitre
  • Patent number: 4905304
    Abstract: A mobile radio facility for installation in a motor vehicle which already includes a junction cable extending from a location in the trunk to a location in the passenger compartment, terminating at each end in a plug connector. The facility includes a radio unit which can be installed in the trunk and plug connected to the vehicular cable, and one or more peripheral units in the passenger compartment such as a micro-telephone, control panel and/or portable telephone. Each peripheral unit has at least a pair of identical plug-in terminals providing identical connections thereto. The facility also includes a plurality of additional junction cables, one of which is plug-connected at one end to the vehicular cable and at the other end to a plug-in terminal of one of the peripheral units. Each of the remaining cables is plug-connected at each end to a plug-in terminal of different peripheral units so as to establish a sequential order of interconnection of all such units to the vehicular cable.
    Type: Grant
    Filed: June 23, 1988
    Date of Patent: February 27, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Hermann Bardon, Ernst Macher
  • Patent number: 4903326
    Abstract: A detachable battery pack with a built-in broadband antenna is disclosed. Since the antenna is wholly contained within the battery housing, it is protected from damage and is detachable from the transceiver when the battery is detached. A transmission line structure formed between the battery and the transceiver is used to create an open circuit near the antenna feed point.
    Type: Grant
    Filed: April 27, 1988
    Date of Patent: February 20, 1990
    Assignee: Motorola, Inc.
    Inventors: Zdravko M. Zakman, Carl V. Novak
  • Patent number: 4903335
    Abstract: A receiver includes a signal-receiving section for receiving input signals and outputting detection signal, and a power source for supplying power thereto. A first detector detects a preamble of each input signal while a second detector detects the end of a postamble of each input signal. A power supply section supplies the power to the signal-receiving section by turning on a switch connected between the signal-receiving section and the power source when the first detector detects the preamble of the input signal. A periodic power-supply section turns on the switch periodically to supply the power periodically to the signal-receiving section when the second detector detects the end of the postamble of each input signal.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: February 20, 1990
    Assignee: Man Design Co., Ltd.
    Inventor: Giichiro Shimizu
  • Patent number: 4903341
    Abstract: There is provided by this invention an optical heterodyning device comprised of a semiconductor heterostructure having a forward biased electrode connected thereto for optically mixing an input signal frequency with a local oscillating frequency in the separate confined laser cavity and a reverse biase electrode connected thereto for detecting the intermediate frequency produced. The local oscillator provides preamplification in the laser cavity and can be effectively phase locked to the input signal frequency.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: February 20, 1990
    Assignee: McDonnell Douglas Corporation
    Inventor: Robert R. Rice
  • Patent number: 4903342
    Abstract: In an optical heterodyne homodyne detection apparatus, signal light and local oscillation light are combined, and the combined light is received in an optical detector to produce intermediate frequency signal which is then demodulated thereby producing base band signals. The frequency sweep of the intermediate frequency signal is performed so that the frequency of the intermediate frequency signal becomes a predetermined value. During the frequency sweep, at least one polarization of the signal light and the intermediate frequency signal is scrambled, and is stopped when the frequency becomes the predetermined value. Thereafter, polarizations of the signal light and the local oscillation light are coincided with each other in accordance with the polarization angle control.
    Type: Grant
    Filed: October 27, 1988
    Date of Patent: February 20, 1990
    Assignee: NEC Corporation
    Inventor: Shuntaro Yamazaki
  • Patent number: 4903336
    Abstract: A tuner with a timepiece for a watch radio includes a display on which either a current time being counted by the timepiece or a frequency being received by the tuner is selectively displayed, and a first key group including a plurality of keys which are operated to control a function of the timepiece and a second key group including a plurality of keys which are operated to control a function of the tuner. An operation of the second key group is inhibited when the current time is displayed on the display. In this state, a displaying state of the display is automatically changed and the frequency is displayed on the display if a band key included in the second key group is operated, and thereafter the operation of the second key group is allowed to control the function of the tuner.
    Type: Grant
    Filed: April 26, 1988
    Date of Patent: February 20, 1990
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Masami Masuhara, Akihito Shimahara
  • Patent number: 4903259
    Abstract: A switching network is constituted by a plurality of time switches which are arranged in a matrix and at cross points between a plurality of input buses and a plurality of output buses, on which frame synchronization signals are multiplexed. Each time switch includes a data memory in which data on the input bus is written in synchronism with the frame synchronization signal included in the input bus, and from which data is read out under the address control of a control memory in synchronization with the frame synchronization signal included in the output bus.
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: February 20, 1990
    Assignee: NEC Corporation
    Inventor: Shin-Ichiro Hayano
  • Patent number: 4903328
    Abstract: An automatic frequency sweeping method for controlling frequency synthesizing type autotuners for broadcasting receivers comprises a first intermediate frequency counting method in which the intermediate frequency is counted for a relatively short first time and the presence or absence of the received signal is judged in a first range having a relatively wide intermediate frequency width and a second intermediate frequency counting method in which the intermediate frequency is counted for a second time longer than the first time and the presence or absence of the received signal is judged in a second range having a intermediate frequency width narrower than that of the first range. Thus, a high speed frequency sweeping is ordinarily executed by using the first intermediate frequency counting method, and when the presence of the received signal is judged in the first intermediate frequency counting method, a more precise judgement is made in accordance with the second intermediate frequency counting method.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: February 20, 1990
    Assignee: NEC Corporation
    Inventor: Masaomi Ichikawa