Patents Assigned to Bell Telephone Laboratories, Incorporated
  • Patent number: 4837129
    Abstract: An article comprised of a body having a conductor pattern on at least one non-planar and non-flexible surface thereof. The article is prepared by using a three-dimensional mask having an interior surface which is a mirror image replica of the surface of the body on which the conductors are to be formed. The surface of the body is provided with material which is capable of initiating conductor formation. The interior surface of the mask then is placed over the body and in substantial registry therewith. The mask and the body then are exposed to radiation or moving material to delineate the conductor pattern. Subsequently, the mask is removed and conductors are formed.
    Type: Grant
    Filed: November 7, 1986
    Date of Patent: June 6, 1989
    Assignees: Kollmorgen Technologies Corp., Bell Telephone Laboratories, Incorporated
    Inventors: David C. Frisch, Louis T. Manzione, Gerhard W. Poelzing, Wilhelm Weber
  • Patent number: 4800485
    Abstract: Users of an on-line documentation facility in a computer system are provided with the capability of specifying modifications to be made to the documentation that would otherwise be provided by the system.
    Type: Grant
    Filed: June 16, 1986
    Date of Patent: January 24, 1989
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: John M. Ackroff, Michael J. Heffler, John C. Mitchell
  • Patent number: 4773034
    Abstract: Each multiply-accumulate device, in an adaptive equalizer, multiplies each input signal sample by an associated coefficient in an ensemble, stores the result and periodically outputs the accumulated results as the equalized input signal. A rotating coefficient register in the adaptive equalizer successively associates each coefficient in the ensemble with a different multiply-accumulate device. Coefficient update circuitry is also provided which periodically updates the coefficients in the ensemble so as to optimize equalizer performance.
    Type: Grant
    Filed: May 9, 1985
    Date of Patent: September 20, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventor: Walter Debus, Jr.
  • Patent number: 4759039
    Abstract: A technique is presented for simplifying the recovery of two synchronous data signals having a common symbol rate after each signal has respectively modulated a different one of a pair of quadrature-related carrier signals. In the transmitter, the data signal which modulates one of the quadrature-related carrier signals is delayed relative to the data signal which modulates the other quadrature-related carrier signal. This delay is related to an IF frequency chosen at the receiver. After passing through a noisy transmission channel, the quadrature-related carrier signals are coupled in the receiver to a serial combination of an equalizer and analog-to-digital converter. This combination outputs multiple, substantially distortion-free samples of the data signals each symbol interval. The two data signals are then recovered by selecting a subset of the samples provided each symbol interval.
    Type: Grant
    Filed: October 20, 1986
    Date of Patent: July 19, 1988
    Assignees: American Telephone & Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Walter Debus, Jr., Howard C. Reeve, III, Curtis A. Siller, Jr.
  • Patent number: 4759037
    Abstract: A technique is disclosed for equalizing an incoming signal including quadrature-related carrier signals by forming the product of the incoming signal at at least one prescribed time and only one real-valued coefficient associated with each time. In one embodiment of the present invention, the equalized incoming signal is demodulated into a first pair of component signals. At least one of these component signals is then used to generate each coefficient. In another embodiment of the present invention, each coefficient is generated in response to at least one of the component signals in the first pair along with a second pair of component signals which are formed by demodulating the incoming signal. This technique can be advantageously adapted to incorporate a number of coefficient updating algorithms and is suitable for use in a number of modulation formats.
    Type: Grant
    Filed: April 28, 1986
    Date of Patent: July 19, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Walter Debus, Jr., Peter D. Karabinis
  • Patent number: 4759036
    Abstract: An improved decision-directed control circuit is disclosed which supplies adjustments to adaptive circuitry in a communications system. The improvement is achieved by only supplying adjustments when there is a high probability that the adjustment is correct. In the disclosed embodiments, this high probability equates, at a minimum, to times when the adaptive circuit output has an amplitude which lies outside of a range extending from the largest to the smallest value of the digital signal. This adjustment approach can be used to adjust a variety of adaptive circuits including transversal equalizers, timing recovery circuits, cross-polarization cancellers and carrier recovery circuits.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: July 19, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventor: Martin H. Meyers
  • Patent number: 4752590
    Abstract: Disclosed are methods that result in substantial improvement of silicon-on-insulator (SOI) device manufacture. We have discovered that carbon can be advantageously used as a wetting agent in the melting-recrystallization (MR) method of producing SOI wafers. We have also found that contacting the wafer (typically subsequent to the formation thereon of a poly-Si layer on a SiO.sub.2 layer but prior to the completion of formation of a SiO.sub.2 cap layer on the poly-Si layer) with an atmosphere that comprises a wetting agent-containing molecular species (e.g., CH.sub.4, NH.sub.3), with the wafer at an appropriate elevated (e.g., 500.degree.-900.degree. C.) temperature, can reliably result in recrystallized Si films of high quality. Furthermore, we have discovered the existence of a previously unknown parameter regime (low thermal gradient across the resolidification front, typically no more than about 4.degree. C./mm) for the MR process that can result in a highly perfect (.chi.
    Type: Grant
    Filed: August 20, 1986
    Date of Patent: June 21, 1988
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Arthur C. Adams, Loren N. Pfeiffer, Kenneth W. West
  • Patent number: 4742548
    Abstract: A second order gradient microphone with unidirectional sensitivity pattern is obtained by housing each of two commerically available first order gradient microphones centrally within a baffle. The baffles have flat surfaces, are preferably square or circular and have parallel surfaces the two baffles being parallel to each other. The rotational axes of the microphones are arranged to coincide. The output signal from one of the microphones is subtracted from the delayed signal output of the other.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: May 3, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Martin Sessler, James E. West
  • Patent number: 4736415
    Abstract: This is an improved resistive line battery feed circuit where the improvement consists in establishing a balanced stable power point using an opamp and capacitive input and feeding the AC output to both lines of the tip and ring circuit via opamps and a hybrid for injecting current. In this manner longitudinal balance is maintained. Current is added to the line circuit by a modulated DC current source.
    Type: Grant
    Filed: July 5, 1985
    Date of Patent: April 5, 1988
    Assignees: American Telephone and Telegraph Company, AT&T Information System Inc., Bell Telephone Laboratories, Incorporated
    Inventors: Bruce W. McNeill, Douglas C. Smith
  • Patent number: 4736389
    Abstract: A technique for digitally synthesizing the amplitude modulation of one or more carrier signals with a random digital data signal is disclosed. Pursuant to the present invention, a memory unit is addressed by a plurality of binary coded digital symbols in the data signal. For each address, at least two digital representations are read out. Each representation corresponds to a different sample of the carrier signals which has been amplitude modulated by a composite of the spectrally shaped data signal. The disclosed technique can be adapted to synthesize a variety of modulation formats, and can provide compensation for fixed in-rail and cross-rail distortions.
    Type: Grant
    Filed: August 4, 1986
    Date of Patent: April 5, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Walter Debus, Jr., Howard C. Reeve, III, Curtis A. Siller, Jr.
  • Patent number: 4730345
    Abstract: A technique for decoding a vestigial sideband signal formed from a double-sideband signal having modulated quadrature-related carrier signals is disclosed. Within the receiver, the vestigial sideband signal is demodulated into a pair of received signals. Each of these received signals comprises a data signal which has been distorted by the double-sideband to vestigial sideband transformation. Pursuant to the present invention, each data signal is recovered in response to the associated received signal and the other data signal. Advantageously, the disclosed technique reduces the bandwidth required to transmit a given amount of information in systems which transmit modulated quadrature-related carrier signals.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: March 8, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventor: Howard C. Reeve, III
  • Patent number: 4730310
    Abstract: A terrestrial radio system which utilizes spot beams, time division multiple access and frequency reuse to provide communications services from a base station to remote customers within a system service region. The base station advantageously is arranged with multistage switching so as to permit the respective sharing of radio transmitters and receivers over larger number of antenna transmitting and receiving ports.
    Type: Grant
    Filed: March 26, 1986
    Date of Patent: March 8, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Anthony Acampora, Ta-Shing Chu, Corrado Dragone, Michael J. Gans
  • Patent number: 4728908
    Abstract: An improved oscillator circuit utilizing multiple semiconductor devices, such as field-effect transistors or bipolar transistors, is disclosed. To improve the gain of the oscillator circuit corresponding terminals on each device are interconnected via a path which provides a delay equal to an integer multiple of the inverse of the oscillator frequency. This technique can be adapted to provide an oscillator whose nominal frequency is voltage controllable and can be arranged to provide one or more output ports.
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: March 1, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventor: Joseph Gonda
  • Patent number: 4726043
    Abstract: The performance of carrier and/or timing recovery circuits which control the recovery of data signals from modulated quadrature-related carrier signals is improved by the use of a phase detector which correlates the two most significant bits of the data signals. This correlation significantly reduces the acquisition time, i.e., the time required for these circuits to acquire synchronous operation. Moreover, this correlation can be advantageously combined with correlations of the most and least significant bits of the data signals to reduce phase jitter as well as reduce the acquisition time.
    Type: Grant
    Filed: November 28, 1986
    Date of Patent: February 16, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventor: Louis Y. Levesque
  • Patent number: 4703416
    Abstract: A communication system controller is operable under program calls from two memories which are independently changeable. A first memory includes a group of hardware-dependent programs and a second memory includes a group of hardware-independent programs. Calls are initiated by programs resident on the first memory to an interface program resident on the second memory at an address known to programs of the first memory. This interface program call includes an argument indentifyng the function program to be called. The interface program uses the argument to determine the location of the function program from a program table and then transfers control to the function program.
    Type: Grant
    Filed: September 19, 1985
    Date of Patent: October 27, 1987
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Joseph A. Crupi, David J. Hayward, David F. Jones
  • Patent number: 4698769
    Abstract: Supervisory audio tones received from a mobile telephone unit are converted from analog to digital form. The tone is then converted to a complex number by bifurcating the tone path and multiplying one path by a sine function and the other path by a cosine function. The complex numbers are accumulated and the frequencies where significant power exists is found using the discrete Fourier transform. If the power at an assigned frequency exceeds a threshold, the corresponding supervisory audio tone is declared to have been detected.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: October 6, 1987
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Ross McPherson, Kenneth F. Smolik, David J. Thomson
  • Patent number: D295169
    Type: Grant
    Filed: July 24, 1987
    Date of Patent: April 12, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
    Inventors: Gihyun Cho, John A. Dispenza, David R. Fischell, Noel A. Smith, James H. Snyder, Christopher Stockbridge, Robert L. Wallace, Jr.
  • Patent number: H551
    Abstract: An optical package includes a two-piece fiber subassembly which allows for separate axial and radial alignment of the fiber to the active optical device. The subassembly consists of an inner ferrule encasing the fiber and an outer sleeve which holds the ferrule. The ferrule is moved axially within the sleeve to perfect the axial alignment of the fiber and the device. The sleeve includes a number of openings around its circumference to expose the ferrule. Once axial alignment is achieved, the outer sleeve is attached to the ferrule through these openings to fix the axial alignment.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: December 6, 1988
    Assignees: American Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated, AT&T Technologies, Incorporated
    Inventors: Ghazi M. Chaoui, Charles R. Fegley, Jan Lipson, Ralph S. Moyer, Thomas S. Stakelon
  • Patent number: H665
    Abstract: A high voltage silicon device with a resistive field shield comprising semi-insulating silicon nitride (sin-SiN). The N/Si ratio is controlled to provide the resistive field shield with the desired conductivity. This resistive field shield material may also serve as an outer protection layer for the device.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: August 1, 1989
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: William R. Knolle, John W. Osenbach
  • Patent number: H763
    Abstract: A new sub-micron bipolar transistor structure is proposed which utilizes narrow horizontal conducting layers between the edges of the active areas and the associated metal contacts. This structure allows the formation of a completely vertical transistor structure and eliminates the need for the extended buried collector and collector reach-through diffusion regions.
    Type: Grant
    Filed: March 21, 1989
    Date of Patent: April 3, 1990
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Anatoly Feygenson