Patents by Inventor Ludovicus M.G.M. Tolhuizen

Ludovicus M.G.M. Tolhuizen 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).

  • Apparatus and methods for use in transmitting and relieving a digital signal and a record carrier obtained by a transmitted apparatus or method
    Patent number: 5854810
    Abstract: A transmitter apparatus for transmitting a digital data signal via a transmission medium (10) includes an error protection encoder (3) for carrying out an error protection encoding on the digital data signal so as to obtain an error protection encoded digital data signal, and a channel encoder (6) for converting the error protection encoded digital data signal processed into a channel encoded digital data signal. The channel encoded digital data signal is supplied to the transmission medium. The error protection encoder (3) is adapted to carry out an error protection encoding step on packets of p m-bit digital words in the digital data signal, and for supplying error protection encoded packets (Q) of n m-bit digital words to an output, where n, m and p are integers larger than 1, and n>p.
    Type: Grant
    Filed: September 4, 1996
    Date of Patent: December 29, 1998
    Assignee: U.S. Phillips Corporation
    Inventors: Adrianus J. M. Denissen, Ludovicus M. G. M. Tolhuizen
  • Apparatus and methods for use in transmitting and receiving a digital signal, and a record carrier obtained by a transmission apparatus or method
    Patent number: 5671236
    Abstract: Apparatus and methods for transmitting and receiving a digital data signal. At the transmitter side, packets of p m-bit digital words in a digital signal are error protection encoded to produce error protection encoded packets of n m-bit digital words making up an error protection signal, where n>p. The error protection encoded packets are converted into converted packets of digital words to form a channel encoded signal, which signal is supplied to a transmission medium. The conversion involves use of a generator for supplying a fixed auxiliary packet of n digital words; a calculation unit for calculating in a Galois field GF(2.sup.m) a converted digital word in accordance with the formula DW.sub.i +.alpha..FW.sub.i, where DW.sub.i and FW.sub.i are the binary values corresponding to the i-th digital words in the packet to be converted and the auxiliary packet, respectively, .alpha.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: September 23, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus J. M. Denissen, Ludovicus M. G. M. Tolhuizen
  • Conversion arrangement for a magnetic recording/reproducing apparatus of the D-type
    Patent number: 5644582
    Abstract: An encoder arrangement (28) for adapting a data signal for recording of the data signal on a D-type magnetic recording apparatus includes an error correction encoding unit (3), a converter unit (6) and a shuffling unit (9). A decoder arrangement (30) for reconverting the signal obtained after reproduction from a D-type reproduction apparatus includes comprises a deshuffling unit (14), an error correction decoding unit (17) and a reconverter unit (20).
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: July 1, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus J. M. Denissen, Wilhelmus H. A. Bruls, Ludovicus M. G. M. Tolhuizen
  • Methods and apparatus for encoding and/or decoding digital data elements with different degrees of error protection in accordance with a quasi-product code
    Patent number: 5623504
    Abstract: Methods and apparatus for encoding and/or decoding digital data elements of a uniform size with different degrees of error protection in accordance with a quasi-product code.
    Type: Grant
    Filed: December 14, 1993
    Date of Patent: April 22, 1997
    Assignee: U.S. Philips Corporation
    Inventor: Ludovicus M. G. M. Tolhuizen