Patents Examined by Robert L. Griffin
  • Patent number: 4918750
    Abstract: A theft prevention camouflage system for a radio-cassette unit including control means removably mounted in the dashboard of a motor vehicle. A cover is removably positioned at the dashboard for concealing the radio-cassette unit from view. A tongue member connected to the cover is adapted to be removably positioned in the cassette recess of the radio-cassette or cassette so as to act as a grip holding the cover in place over the radio-cassette unit around the frame. A protruding lip extending transversely from the inner surface of the edge of the cover and the inner surface of the cover define a hollow; the auditory control means are positioned in the hollow when the cover is mounted over the radio-cassette unit. The outer surface of the cover is generally of the same decorative scheme as the dashboard.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: April 17, 1990
    Inventor: Alan Buckley
  • Patent number: 4916689
    Abstract: A fiber optic multiplexing controller for transmitting a separate original electrical signal to each of a plurality of signal receiving devices. Each separate original electrical signal originates from one or a plurality of signal sending units. A transmit section of the controller includes an encoder for encoding the separate original electrical signals into a single multiplexed electrical signal. The transmit section further includes a fiber optic transmitter for converting the multiplexed electrical signal to an optical signal. Thereafter, the optical signal is transmitted via fiber optics to a receive section of another identical controller. This receive section includes an optical receiver, provided for the purpose of receiving the transmitted optical signal and converting it to a multiplexed electrical signal. The multiplexed signal, whether electrical or optical, is made up of discrete portions. Each portion of the signal is devoted to a predetermined one of the separate original electrical signals.
    Type: Grant
    Filed: December 29, 1987
    Date of Patent: April 10, 1990
    Assignee: Eaton Corporation
    Inventor: Ralph F. Bielinski
  • Patent number: 4914652
    Abstract: A method is provided for use in a Token ring network including a plurality of stations serially connected by a transmission medium so as to form a closed loop on which packets of data are circulated, wherein each respective station includes a media access controller and a buffer memory, the method including the steps of transferring data of a respective packet from a media access controller to a buffer memory; storing the data in a sequence of contiguous memory locations in the buffer memory; in the course of the step of transferring the data, generating status information for the data; after said step of storing the data, storing the status information in the buffer memory contiguously with the stored data at the beginning of the sequence of memory locations in which the data are stored.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: April 3, 1990
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Hang Diem Nguyen
  • Patent number: 4914654
    Abstract: A multiplex transmission system, in which one of a plurality of nodes, as a transmission node, mutually coupled together through a transmission path transmits data frame by frame to at least one of other nodes as at least one of reception node, and the reception node returns a reception acknowledge signal to the transmitting node upon proper reception of the frame of data. A reception acknowledge signal area comprising a plurality of bits is provided following the frame transmitted from the transmitting node. The reception acknowledge signal area is divided into a plurality of bit areas which are respectively assigned to the plurality of nodes. The reception node returns the reception acknowlege signal to the transmitting node from the respectively-assigned bit areas of the reception acknowledge signal area.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: April 3, 1990
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Yutaka Matsuda, Teruhisa Inoue, Kyousuke Hashimoto, Kiyoshi Inoue, Yusaku Himono
  • Patent number: 4914677
    Abstract: An analog input signal is converted into a digital signal. The digital signal is shifted to the difference frequency region by mixing it with each of a sine wave local signal and a cosine wave local signal to obtain complex waveform data. On the other hand, a trigger signal is generated when a reference signal meets a specific requirement, and a frame composed of a fixed number of data is defined which is synchronized with the trigger signal. The complex waveform data of each frame thus defined is phase rotated so that its phase angle has a predetermined value, or the phases of the local signals are synchronized with the trigger signal so that the complex waveform data of respective frames have the same phase. The in-phase complex waveform data of plural frames thus obtained may also be averaged, if necessary.
    Type: Grant
    Filed: October 3, 1988
    Date of Patent: April 3, 1990
    Assignee: Advantest Corporation
    Inventors: Takahiro Yamaguchi, Toru Nakanishi, Norio Arakawa, Yoshio Takanaga
  • Patent number: 4914675
    Abstract: Variable-length codewords are grouped into successive N bit word groups in sequential order as received from a variable length codeword encoder. The N-bit groups are each stored in corresponding N-bit-wide memory locations in a buffer memory prior to transmission over a channel. The locations are filled to capacity on one clock pulse and emptied on a second clock pulse to efficiently utilize the memory at a given clock rate.
    Type: Grant
    Filed: January 28, 1988
    Date of Patent: April 3, 1990
    Assignee: General Electric Company
    Inventor: Nicola J. Fedele
  • Patent number: 4914648
    Abstract: The present invention relates to a multichannel multihop lightwave communication network which allows packet concurrency in the network while avoiding the need for agile optical devices. The network comprises a lightwave communication medium (10) for supporting a plurality of independent user nodes; and a plurality of N network interface units (NIUs) (11). Each NIU is connected to the lightwave medium and one or more separate user nodes and comprises a trnasmitter section (28-35) and a receiver section (20-27) which are each fixedly assigned to transmit and receive, respectively, over a single channel or a plurality of separate channels to or from other NIUs of the network. In a connectivity pattern for one embodiment of the network, the NIUs are divided into k groups of p.sup.k NIUs such that each NIU of a first group of p.sup.
    Type: Grant
    Filed: March 29, 1989
    Date of Patent: April 3, 1990
    Assignees: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Anthony Acampora, Michael G. Hluchyj, Mark J. Karol
  • Patent number: 4912723
    Abstract: A low cost, multipurpose digital IC is used as the basic building block in establishing a network communication system over a desired communication link. The digital IC can function as an addressable microcomputer interface between the network line and a remotely located microcomputer which may, for example, comprise any microprocessor based controlled product. In such mode, the digital IC's function is to take data from the network and pass it on to the remotely located microcomputer upon command from the central controller and to transmit data from the microcomputer to the central controller. The digital IC may also function as a nonaddressable microcomputer interface between the central or master controller and the network line. In such case the digital IC's function is to continuously take data from the central controller and place it on the network and take data from the network and pass it back to the central controller.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: March 27, 1990
    Assignee: Westinghouse Electric Corp.
    Inventor: William R. Verbanets, Jr.
  • Patent number: 4912524
    Abstract: The invention relates to a system to transmit digital signals reproduced from a compact disk player, a digital audio tape recorder or the like. In order to increase the S/N ratio of transmission of the digital signals, the occurrence probability of data to be transmitted is made low and light emission time of a light emission element is made small, and the peak value of emission is increased corresponding to the above reduction. As a result, the S/N ratio can be increased in the same transmission band as that in the prior art. In order to reduce the occurrence probability of data, a method of generating pulses at the leading edge and the trailing edge of a pulse signal or a method of compressing data is provided.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: March 27, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Masafumi Nakamura, Tosifumi Takeuchi, Yutaka Nagai
  • Patent number: 4912523
    Abstract: In an optical fiber communication system that operates at a wavelength .lambda..sub.o and comprises optical fiber having a cut-off wavelength .lambda..sub.c >.lambda..sub.o, a "grating", with parameters chosen such that the grating causes resonant coupling between a predetermined guided mode (e.g., LP.sub.11) and a tunneling-leaky mode, can be advantageously used to remove unwanted guided modes. Such removal can substantially improve the bandwidth of such a system.
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: March 27, 1990
    Assignee: AT&T Bell Laboratories
    Inventors: James J. Refi, Ian A. White
  • Patent number: 4912525
    Abstract: Apparatus for transmitting optical signals from an unprotected environment to a protected environment are disclosed. The apparatus may take the form of a lightpipe which has a light transmitting core and a cladding material surrounding the core having an index of refraction lower than the core. The lightpipe is aligned with a photodetector by means of a retaining collar. An omnidirectional optical signal collector is also disclosed for receiving optical signals from any direction and relaying them to a secure photodetector.
    Type: Grant
    Filed: January 24, 1989
    Date of Patent: March 27, 1990
    Assignee: Universal Photonix, Inc.
    Inventor: Douglas A. Pinoow
  • Patent number: 4912701
    Abstract: A packet switching module connects to a multiplexed carrier line which has at least an input line and an output line. A receiver circuit receives an information frame over the multiplexed carrier line. The information frame has a predetermined format which includes a physical destination address. A plurality of processing modules and a controller are connected to a common memory and switching the packets according to the destination addresses. The new information frame is outputted on the multiplexed carrier line by a transmitter circuit.
    Type: Grant
    Filed: December 23, 1987
    Date of Patent: March 27, 1990
    Assignee: Rockwell International Corporation
    Inventor: David C. Nicholas
  • Patent number: 4912728
    Abstract: An analog-to-digital converter for use with a stepped square 2.sup.2n -QAM demodulator comprises a first group of (2.sup.n+1 -1) comparators for detecting signal points of a demodulated signal of a stepped square QAM system which are located within a 2.sup.n .times.2.sup.n square of the signal constellation of the stepped square QAM system, and a second group of four comparators for detecting signal points located outside of the square. A first logic circuit is provided to convert the outputs of the comparators of the first group to a first multibit digital signal representative of the signal points located within the square, and a second logic circuit is provided for converting the outputs of the comparators of the second group to a second multibit digital signal representative of the signal points located outside of the square.
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: March 27, 1990
    Assignee: NEC Corporation
    Inventor: Takumi Deguchi
  • Patent number: 4912526
    Abstract: An optical frequency synthesizer and/or sweeper, whereby a coherent optical output light is obtained by using a wavelength stabilized laser and an optical phase locked loop wherein the frequency of the output has the characteristics of high accuracy, high stability and narrow spectral line width. The optical phase locked loop comprises a tunable laser, an optical frequency multiplier, an optical frequency shifter and an optical heterodyne detector, wherein the optical phase locked loop is capable of precisely outputting an arbitrary wavelength by feeding back an output optical frequency.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: March 27, 1990
    Assignee: Yokogawa Electric Corporation
    Inventors: Hideto Iwaoka, Akira Ohte, Koji Akiyama
  • Patent number: 4912521
    Abstract: An electro-optical transducer assembly for translating between an optical high speed serial data transmission path and parallel electrical data transmission paths is provided by a light emitting or light detecting device with serial terminals, a logic chip with timing, amplifying, serializing or de-serializing circuitry, and a multi-layer coupling chip with parallel input or output contacts mounted between the device and the logic chip for coupling the serial terminals of the device to the serial terminals on the logic chip and coupling the logic chip parallel terminals to the parallel input or output contacts.
    Type: Grant
    Filed: October 30, 1987
    Date of Patent: March 27, 1990
    Assignee: International Business Machines Corporation
    Inventors: Frank A. Almquist, Roger Gjone, Thor A. Larsen, Roman Hawryluk
  • Patent number: 4912726
    Abstract: The present invention relates to a circuit which controls the decision timing for deciding multi-level signal to the optimum decision timing. The control is carried out in such a manner as reducing deviation of phase of decision clock by deciding slope of multi-level signal at the center decision timing from the decision data at least continuous three decision timings and deciding deviation of decision timing from the slope and error signal at the center decision timing. Moreover, two kinds of slope decision are realized and the desired slope decision can be selected in accordance with the line condition.
    Type: Grant
    Filed: August 31, 1988
    Date of Patent: March 27, 1990
    Assignee: Fujitsu Limited
    Inventors: Takanori Iwamatsu, Yoshihito Aono, Morihiko Minowa, Sadao Takenaka
  • Patent number: 4910751
    Abstract: A method of reversibly compressing a sequence x(k) of information-carrying symbols, preferably digital signals which can assume Q discrete values, K being an index assuming integral number values, and consists in that the sequence x(k) is processed in means (1) to form a residue w(k), whereafter a modulo Q operation is carried out on the residue w(k). The modulo Q reducing sequence w(k) is finally encoded to form a compressed sequence n(k), which contains the same information as the original sequence x(k). In reconstructing the sequence x(k), the compressed sequence n(k) is decoded and subsequently processed in inversion means (5) to form a sequence y(k), on which a modulo Q operation is carried out, whereby the original sequence n(k) is obtained. An apparatus for carrying out the method includes means (1), means (2) for carrying out the modulo Q operations and an encoder (3).
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: March 20, 1990
    Assignee: Telefonaktiebolaget L M Ericsson
    Inventor: Goran H. Einarsson
  • Patent number: 4910795
    Abstract: A microphone is provided in which two circuit boards are held in spaced parallel position by each being connected at one end to a supporting member and by each resting at the other end in a pair of stabilizing grooves located within the microphone head. A battery holding assembly has attached at one end the supporting member, and at the other end an antenna mounting surface onto which a coiled antenna is placed. A battery holding compartment is located between the supporting member and the antenna so that a battery held in the compartment acts as an addition to the antenna itself. A power and battery level indicator flashes on and off to warn that the charge of the battery is reaching a predetermined low point. The electronic circuitry for the indicator is also provided.
    Type: Grant
    Filed: June 11, 1987
    Date of Patent: March 20, 1990
    Inventors: Clinton R. McCowen, Gerald G. Doiron
  • Patent number: 4910726
    Abstract: A multi-channel wideband monomode optical fibre network having at least one transmitting station and a plurality of receiving terminals connected to the transmitting station by monomode optical fibres. One or more sources of temporally coherent optical power, for example laser transmitters are connected to the network to feed optical power locally to the receiving terminals. The number of sources is less than the number of terminals.
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: March 20, 1990
    Assignee: British Telecommunications public limited company
    Inventor: Ian Stanley
  • Patent number: 4910044
    Abstract: Ultraviolet light is emitted mainly with 185 nm in wave length so that a thick silicon layer is fabricated by decomposition of silane gas at a high deposition speed. As a light source, a bulb is filled with an amount of mercury gas without dosing argon gas which enhances preferentially light with 254 nm in wave length.
    Type: Grant
    Filed: September 1, 1988
    Date of Patent: March 20, 1990
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Kazuo Urata, Mamoru Tashiro, Yuji Tanamura, Shinji Imato, Takashi Inujima, Shigenori Hayashi