Patents Represented by Attorney J. P. Kearns
  • Patent number: 4442540
    Abstract: A system for interpolating digital data signals to a frequency band above analog speech signals in a common transmission channel is disclosed. The system utilizes short time frequency analysis techniques to determine the cutoff frequency of the speech signal. Data signals temporarily held in storage within the system are thereafter modulated into an unused frequency band of the transmission channel above that needed for speech signals. The combined speech and data signals in the system are sent to a receiver which relays the respective speech and data signals to their appropriate locations. This system is compatible with digital signal processing techniques using Fast Fourier Transform Technology in conjunction with solid state logic elements.
    Type: Grant
    Filed: June 4, 1981
    Date of Patent: April 10, 1984
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Jonathan B. Allen
  • Patent number: 4436365
    Abstract: A transmission link is established between remote electrical transducers, e.g., underwater, and a monitoring receiver, e.g., shore-based, over an optical fiber link using integrated optical waveguides. Optical directional couplers with absorber and reflector elements incorporated in the waveguides at respective terminals of the transmission link permit the injection of light into the fiber at the monitoring terminal and the modulation of reflected light at the transducer terminal in accordance with an electrical signal from the transducer. No electrical energy then needs to be transmitted between the monitoring and transducing terminals of the transmission link. The link itself is thus light in weight and free of electrical currents subject to electromagnetic interference.
    Type: Grant
    Filed: October 21, 1981
    Date of Patent: March 13, 1984
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Martin G. Hodgins, William J. Jordan
  • Patent number: 4419623
    Abstract: A circuit capable of measuring the value of an unknown reactance over a wide range of values resonates the unknown reactance with a known reactance value of opposite type by means of an operational amplifier. An adjustable feedback resistance connected between the output and input of the operational amplifier triggers the oscillation. The value of the unknown reactance is then readily computed from the resonant frequency and the known reactance value. In a further calculation the Q of the circuit can be determined from the feedback resistance value.
    Type: Grant
    Filed: December 7, 1981
    Date of Patent: December 6, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Raymond W. Ketchledge
  • Patent number: 4419757
    Abstract: A system for generating a drift-free three-level pulse signal from a two-level input signal involves an improvement over prior art in that output transformers are eliminated. This system is compatible with integrated circuit techniques using solid state logic elements in conjunction with a capacitor-resistor combination at the output.
    Type: Grant
    Filed: March 16, 1981
    Date of Patent: December 6, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Cosmo H. De Gennaro, Neil Hooper
  • Patent number: 4414642
    Abstract: Apparatus for generating the inverse or reciprocal of a binary number simplifies the implementation of previous methods. A plurality of registers, a comparator subtractor and a clock circuit are used in combination to modify a long division operation to generate the desired inverse number expeditiously.
    Type: Grant
    Filed: April 9, 1981
    Date of Patent: November 8, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Gerald W. Grube
  • Patent number: 4384364
    Abstract: A quadrature modulation analog transmission system provides an extended dynamic range of amplification by dividing the total gain desired between the two quadrature channels without overloading the transmission medium. The direct channel furnishes a higher gain for low-level background noise signals, while the quadrature channel furnishes a lower gain for high-level signaling tones.
    Type: Grant
    Filed: April 4, 1980
    Date of Patent: May 17, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Hansjuergen H. Henning
  • Patent number: 4380838
    Abstract: An article of furniture, such as a bed or a chair, provides improved comfort by supporting a human body resting thereon and adaptively conforming to the body contours in contact with the support surface while providing a distribution of support forces that does not vary significantly as the contour changes. A segmented frame pivotally supported on pairs of balance levers which in turn are pivotally attached to a firm base provides a floating action. When ratios of distances of lever ends from their pivot points are selected in inverse ratio to the weights of the human body sections to be supported by attached frame segments, the resulting distribution of support forces matches the distribution of weight in the body and tends to relieve muscle tension.
    Type: Grant
    Filed: April 8, 1981
    Date of Patent: April 26, 1983
    Inventor: Milton Lutchansky
  • Patent number: 4374795
    Abstract: A method for preforming magnetic drum material involves the use of a hydraulic press and sleeve which in turn compresses the material and then cuts the material into a specific shape. This process is repeated until the material builds up in the sleeve to the required charge thickness. This method has improved the molding process by eliminating air and gas voids in the molded magnetic drum.
    Type: Grant
    Filed: September 11, 1980
    Date of Patent: February 22, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: John P. Keilp, Warren F. Moore, Victor Sirbu
  • Patent number: 4366938
    Abstract: A mechanism for providing fixed attachment points along an extended cylindrical object, such as a cable, utilized helically counterwound straps terminated in loops to form a common gripping junction. In order to forestall slippage heat shrinkable tubes are applied over the crisscrossed straps.
    Type: Grant
    Filed: March 25, 1981
    Date of Patent: January 4, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: John S. McSpadden
  • Patent number: 4365111
    Abstract: 23.
    Type: Grant
    Filed: June 11, 1946
    Date of Patent: December 21, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Amos E. Joel, Jr.
  • Patent number: 4343970
    Abstract: 1. In electrical signaling in which the signal varies in amplitude from instant to instant, and at any one instant has an amplitude equal to one of a limited number of values having a total range in excess of two, means to disguise the signal preparatory to transmission comprising means in each instant to establish for transmission under control of said signal a voltage having with substantially equal probability any one of a like limited number of amplitude values having a total range in excess of two, means to transmit said established voltages, and means at a receiving point to retranslate the transmitted voltages into the clear signal.
    Type: Grant
    Filed: February 19, 1953
    Date of Patent: August 10, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Walter Koenig, Jr.
  • Patent number: 4336288
    Abstract: A technique for preventing salt migration in a salt solution at elevated temperature involves selectively coating the container with an RTV (Room Temperature Vulcanizing) dispersion, allowing the dispersion to cure. The coating's slippery surface prevents the salt from creeping up the sides of the container.
    Type: Grant
    Filed: September 18, 1980
    Date of Patent: June 22, 1982
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Ernest J. Leddy
  • Patent number: 3974449
    Abstract: An adaptive feedforward transversal equalizer acting jointly with a data decision-directed demodulating carrier recovery system to achieve substantially jitter-free passband equalization of a suppressed-carrier coherent data signal without the use of pilot tones is improved by adding a feedback transversal filter section operating on past demodulated data symbols. The weighted output of the feedback section is subtracted from the demodulated output output of the feedforward section to provide signals from which data decisions are made and common error signals are derived. Tap-gain coefficients for both feedforward and feedback filter sections and phase angle for the demodulating carrier recovery system are adaptively updated in accordance with the common error signal. Severe frequency offset and phase jitter are simultaneously compensated.
    Type: Grant
    Filed: March 21, 1975
    Date of Patent: August 10, 1976
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: David Duncan Falconer