Patents by Inventor Andre Bazet

Andre Bazet has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5875214
    Abstract: A device for initializing a Viterbi decoder in a receiver for signals transmitted in the form of bursts, each burst comprising a synchronization word and message data that has undergone convolutional coding in a transmitter, the position of the message data relative to the synchronization word being known, includes a detector for detecting the synchronization word, a multiplexer for applying the received signals to the Viterbi decoder in the presence of the message data and for applying to the Viterbi decoder, immediately before and immediately after the message data, a code sequence generated locally, free of errors and having a length at least equal to the truncation length of the Viterbi decoder.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: February 23, 1999
    Assignee: Alcatel Telspace
    Inventors: Oliver Urbaniak, Andre Bazet
  • Patent number: 5329536
    Abstract: A method and apparatus for sequential decoding using the stack algorithm. A stack is used which is small in size and which has a leaky bottom. A counter stores the total count of nodes observed so as to abandon decoding if this count exceeds a fixed value. A comparator continuously compares the metric at the top of the stack with the largest metric lost from the bottom of the stack as stored in a memory. A small memory stores the path scanned through the logic tree, thereby directly providing the decoded block.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: July 12, 1994
    Assignee: Alcatel Transmission par Faisceaux Hertziens A.T.F.H.
    Inventors: Marc Darmon, Andre Bazet, Pascal Brelivet
  • Patent number: 5257263
    Abstract: In a circuit for decoding convolutional codes for executing the survivor path storage and reverse scanning stage of a Viterbi algorithm, decoding consists in reverse scanning a plurality of paths of a trellis representing a diagram of the possible transitions resulting from encoding by an encoder comprising .nu. flip-flops, each node of the trellis being represented by a word on N=2.sup..nu. bits. The circuit selects from a plurality of possible survivor paths that which has the lowest metric, so as to reconstitute the trellis path actually determined by the encoding process and to recover the sequence of information bits that caused this path to be adopted. The circuit comprises a memory storing a plurality of said words of N=2.sup..nu. bits and, connected to the output of said memory, a cascade of .nu. groups of 2-in-1 multiplexers progressively combining the 2.sup..nu. outputs of the memory into a single output, a D flip-flop being provided at the output of each multiplexer.
    Type: Grant
    Filed: June 26, 1991
    Date of Patent: October 26, 1993
    Assignee: Alcatel Transmission par Faisceaux Hertziens
    Inventors: Andre Bazet, Philippe Sadot