Patents Represented by Attorney Ronald J. Clark
  • Patent number: 6435737
    Abstract: A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 20, 2002
    Assignee: Discovision Associates
    Inventors: Adrian Philip Wise, Martin William Sotheran, William Philip Robbins
  • Patent number: 6217234
    Abstract: An MPEG video decompression method and apparatus utilizing a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system, including memory addressing, transforming data using a common processing block, time synchronization, asynchronous swing buffering, storing of video information, a parallel Huffman decoder, and the like.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 17, 2001
    Assignee: Discovision Associates
    Inventors: Kevin D. Dewar, Anthony Mark Jones, Martin William Sotheran, David Andrew Barnes
  • Patent number: 6035126
    Abstract: A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 7, 2000
    Assignee: Discovision Associates
    Inventors: Adrian Philip Wise, Martin William Sotheran, William Philip Robbins
  • Patent number: 5984512
    Abstract: An MPEG video decompression method and apparatus utilizing a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in select stages and are responsive to a recognized control token for reconfiguring such stages to handle an identified DATA Token. A wide variety of unique supporting subsystems circuitry and processing techniques are disclosed for implementing the system, including memory addressing, transforming data using a common processing block, time synchronization, asynchronous swing buffering, storing of video information, a parallel Huffman decoder, and the like.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 16, 1999
    Assignee: Discovision Associates
    Inventors: Anthony Mark Jones, Colin Smith, Helen Rosemary Finch, Anthony Peter John Claydon, Donald William Patterson, William P. Robbins, Nicholas Birch, David Andrew Barnes
  • Patent number: 5920539
    Abstract: An apparatus for the suppression of electromagnetic emissions from an electronic device. The apparatus includes a die cast metallic container having a continuous wall, a shoulder formed on the continuous wall, a plurality of rounded corners, and a neck portion. The neck portion and shoulder mate with a deep drawn metallic cap. A source of electromagnetic emissions is disposed in the interior space defined by the container and the cap, and a flex strip source passes through a groove formed in an external wall of the container to supply the source. The container is adapted for use in an optical disc system and provides a mount for a semiconductor laser modulated at a radio frequency on the order of 450 MHz. The container also holds auxiliary electronics. A conductive tape seals the assembly so that electromagnetic emissions of the laser are confined within the interior space.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: July 6, 1999
    Assignee: Discovision Associates
    Inventors: David L. Schell, Marvin B. Davis
  • Patent number: 5910960
    Abstract: A CMOS Reed-Solomon decoding circuit calculates syndromes, executes a Berlekamp algorithm, performs a Chien Search, and corrects a delayed version of the received data according to a calculated magnitude of error. The circuit is optimized in terms of chip territory and circuit complexity. Signals are provided to indicate uncorrectable packet errors and other transmission errors.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 8, 1999
    Assignee: Discovision Associates
    Inventors: Anthony Peter J. Claydon, Charles D. MacFarlane, Richard J. Gammack, Anthony Mark Jones, William P. Robbins, Mark Barnes
  • Patent number: 5878273
    Abstract: An MPEG video decompression method and apparatus utilizing a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system, including memory addressing, transforming data using a common processing block, time synchronization, asynchronous swing buffering, storing of video information, a parallel Huffman decoder, and the like.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 2, 1999
    Assignee: Discovision Associates
    Inventors: Adrian P. Wise, Martin William Sotheran, William P. Robbins
  • Patent number: 5878015
    Abstract: A laser driver for controlling an electrical current supplied to a laser in an optical disc system. The laser driver includes pass transistors for delivering electrical current to the laser, an operational amplifier for setting a reference voltage on the bases of the pass transistors, and a CMOS buffer for applying a drive voltage to emitter circuits of the pass transistors. The drive voltage has a first voltage level and a second voltage level, and the electrical current is supplied to the emitter circuits only when the drive voltage is at the first voltage level. The laser driver further includes a switch for switching the drive voltage between the first voltage level and the second voltage level so that electrical power is consumed only when the laser is energized and enhanced rise and fall switching characteristics are thereby achieved.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 2, 1999
    Assignee: Discovision Associates
    Inventors: David L. Schell, David E. Lewis
  • Patent number: 5861894
    Abstract: This invention provides a method to control the buffering of encoded video data organized as frames or fields. This method involves determining the picture number of each incoming decoded frame, determining the expected presentation number at any time and marking any buffer as ready when its picture number is on or after the presentation number.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 19, 1999
    Assignee: Discovision Associates
    Inventors: Martin William Sotheran, Helen R. Finch
  • Patent number: 5842033
    Abstract: A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: November 24, 1998
    Assignee: Discovision Associates
    Inventors: Adrian P. Wise, Martin Sotheran, William P. Robbins
  • Patent number: 5835740
    Abstract: A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 10, 1998
    Assignee: Discovision Associates
    Inventors: Adrian Philip Wise, Martin William Sotheran, William Philip Robbins
  • Patent number: 5835792
    Abstract: An MPEG video decompression method and apparatus utilizing a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system, including memory addressing, transforming data using a common processing block, time synchronization, asynchronous swing buffering, storing of video information, a parallel Huffman decoder, and the like.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 10, 1998
    Assignee: Discovision Associates
    Inventors: Adrian P. Wise, Kevin D. Dewar, Anthony Mark Jones, Martin William Sotheran, Colin Smith, Helen Rosemary Finch, Anthony Peter John Claydon, Donald William Patterson, Mark Barnes, Andrew Peter Kuligowski, William P. Robbins, Nicholas Birch, David Andrew Barnes
  • Patent number: 5829007
    Abstract: A RAM implementation of asynchronous swing buffering is provided in which two buffers are operated asynchronously; one is written while the other is read. Accordingly, this allows for a data stream having a fast rate of through-put to be resynchronized to another rate, while still maintaining a desired rate. In the invention, the write control and read control both have state indicators for communicating which buffer they are using and whether the controls are waiting for access or are, in fact, accessing that buffer.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 27, 1998
    Assignee: Discovision Associates
    Inventors: Adrian P. Wise, Kevin D. Dewar, Anthony Mark Jones, Martin William Sotheran, Colin Smith, Helen Rosemary Finch, Anthony Peter John Claydon, Donald William Patterson, Mark Barnes, Andrew Peter Kuligowski, William P. Robbins, Nicholas Birch, David Andrew Barnes
  • Patent number: 5828054
    Abstract: An improved focusing method including focus capture and focus control in an optical disc system having a lens and a disc. The method includes the steps of impinging light upon a disc to be read; moving the lens to a first position; monitoring a Quad Sum signal; moving the lens away from the first position towards the disc being read while looking for a maximum of the Quad Sum signal; moving the lens away from the disc; monitoring total light received from the disc; determining, during the monitoring of light, when the total light is above one-half a measured peak value; searching for a first zero crossing; determining when the Quad Sum signal exceeds approximately one-half peak amplitude; and closing focus when the Quad sum signal exceeds the one-half peak amplitude.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 27, 1998
    Assignee: Discovision Associates
    Inventor: David L. Schell
  • Patent number: 5828907
    Abstract: An MPEG video decompression method and apparatus utilizing a plurality of stages interconnected by a two-wire interface arrangedas a pipeline processing machine. Control tokens and DATA Tokens pass ovef the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system, including memory addressing, transforming data using a common processing block, time synchronization, asynchronous swing buffering, storing of video information, a parallel Huffman decoder, and the like.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 27, 1998
    Assignee: Discovision Associates
    Inventors: Adrian P. Wise, Martin William Sotheran
  • Patent number: 5821885
    Abstract: An MPEG video decompression method and apparatus utilizing a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system, including memory addressing, transforming data using a common processing block, time synchronization, asynchronous swing buffering, storing of video information, a parallel Huffman decoder, and the like.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 13, 1998
    Assignee: Discovision Associates
    Inventors: Adrian P. Wise, Kevin D. Dewar, Anthony Mark Jones, Martin William Sotheran, Colin Smith, Helen Rosemary Finch, Anthony Peter John Claydon, Donald William Patterson, Mark Barnes, Andrew Peter Kuligowski, William P. Robbins, Nicholas Birch, David Andrew Barnes
  • Patent number: 5818855
    Abstract: A Reed-Solomon decoder includes an optimized Galois Field multiplication circuit. The circuit has a plurality of multipliers, connected in a linear chain, wherein a first multiplicand of the first multiplier is the magnitude A, and the second multiplicand is a constant. The circuit operates on a linear combination of alpha values that sum to .alpha..sup.j, each multiplier in the chain generating a succeeding alpha value. A plurality of selectors enable the outputs of the multipliers according to the magnitude .alpha..sup.j. An addition circuit, preferably realized as a logical network of XOR gates, is connected to the selectors for adding the enabled outputs of the multipliers to form the final product.
    Type: Grant
    Filed: February 18, 1997
    Date of Patent: October 6, 1998
    Assignee: Discovision Associates
    Inventor: Thomas Foxcroft
  • Patent number: 5808980
    Abstract: An apparatus for optically reading or recording information on an optical disc which is rotatable about an axis of rotation. The apparatus includes a frame, a carriage movable relative to the frame along a path orthogonal to the axis of rotation, and a carriage drive for driving the carriage along the orthogonal path. Specific portions of the carriage drive are mounted on the carriage so that the carriage and the mounted portions define a center of carriage mass. An objective lens having an optical axis along a Z-axis and a center of lens mass is provided in an objective lens holder. The holder is movable relative to the carriage and receives a beam of light traveling along an X-axis. Flexures are provided for movably supporting the objective lens holder relative to the carriage. The flexures each have a hinge point within an XZ plane so that movement of the lens holder is provided by hinge action at the hinge points.
    Type: Grant
    Filed: April 11, 1995
    Date of Patent: September 15, 1998
    Assignee: Discovision Associates
    Inventors: Kurt W. Getreuer, Leonardus J. Grassens
  • Patent number: 5809270
    Abstract: A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: September 15, 1998
    Assignee: Discovision Associates
    Inventor: William Philip Robbins
  • Patent number: 5805914
    Abstract: A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 8, 1998
    Assignee: Discovision Associates
    Inventors: Adrian Philip Wise, Martin William Sotheran, William Philip Robbins, Anthony Peter John Claydon, Kevin James Boyd, Helen Rosemary Finch