Patents by Inventor Patrick W. Elliott

Patrick W. Elliott 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: 5809015
    Abstract: A slot selection algorithm for use in a multi-slot TDMA communications system which has provision for transmissions requiring a single time slot or a double time slot. The algorithm requires that whenever possible a transmission requiring a single time slot is allocated to an acceptable, but not necessarily the best, inactive time slot which is located adjacent to an active time slot in a TDMA frame. By so doing the number of inactive time slots available for double time slot transmissions may be increased.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: September 15, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Patrick W. Elliott, Nikolaou T. Kanaropoulos
  • Patent number: 5451951
    Abstract: In a code excited linear prediction (CELP) analog signal coding system sequences from a master codebook (40), which may be a one dimensional codebook, are filtered (42) and then stored in slave codebooks (70,72). Input analog siganls (20)are filtered (34,36) and compared orthogonally (66,78,80) with sequences from the slave codebooks and an optimum pair of sequences are selected. Reduced length sequences from the master codebook may be compared with orthogonalized analog signals since orthogonalized siganls contain some redundancy.
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: September 19, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Patrick W. Elliott, Timothy J. Moulsley
  • Patent number: 5140638
    Abstract: A speech coding system of the code excited linear prediction (CELP) type includes apparatus (24,26) for filtering digitized speech samples to form perceptually weighted speech samples. Entries in a one-dimensional codebook (110) comprising frame length sequences are filtered in a perceptually weighted synthesis filter (28) to form a one-dimensional filtered codebook. The filtered codebook entries are compared with the perceptually weighted speech signals to obtain a codebook index which gives the minimum perceptually weighted error when the speech is resynthesized. Using a one-dimensional codebook (110) reduces the amount of computation which is required compared to the use of a two-dimensional codebook.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: August 18, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Timothy J. Moulsley, Patrick W. Elliott