Patents by Inventor Erik W. Gaal

Erik W. Gaal 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).

  • Methods and devices for encoding data symbols in accordance with a BCH code to obtain a code word in which parity symbols are located in the middle of the code word
    Patent number: 5471486
    Abstract: Methods and devices for encoding data symbols in accordance with a BCH code to obtain a code word in which parity symbols are located in the middle of the code word. The data symbols are supplied to a parity determining device in a predetermined order to produce the parity symbols, which parity determining device either employs a shift register or a shift register bank.
    Type: Grant
    Filed: February 7, 1995
    Date of Patent: November 28, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Constant P. M. J. Baggen, Erik W. Gaal
  • Method of and device for recording information, record carrier, device for reading the recorded information, and encoding and decoding circuit for use in the recording and read device
    Patent number: 5048003
    Abstract: A method is revealed for recording an information signal (Vi) on a record carrier (1). The information signal (Vi) is converted into code words (200), which comprise a variable number of bits of a first logic value ("1") and a variable number of bits of a second logic value ("0"). The number of successive bits of the first logic value ("1") is at least equal to P. The number of successive bits of the second logic value, situated between the bits of the first logic value, is at least equal to Q, Q being greater than P. A pattern of recording marks (8;54) corresponding to the code signal (Vc) is recorded on the record carrier (1) in such a way that bits of the first logic value ("1") are represented by recording marks (8;54). Moreover, an information recording device (FIG. 17), an information read device, and a decoding device (FIG. 18) are revealed.
    Type: Grant
    Filed: January 30, 1991
    Date of Patent: September 10, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Constant P. M. J. Baggen, Cornelis M. J. Van Uijen, Erik W. Gaal
  • Method of and device for recording information, record carrier, and device for reading the recorded information
    Patent number: 4930115
    Abstract: A method of and device for recording an information signal (Vc) on a record carrier (1) are revealed. The information words of the information signal are converted into code words (200) comprising a variable number of bits of a first logic value ("1"). The number of consecutive bits of the first logic value is at least equal to P. the number of consecutive bits of the second logic value ("0") is at least Q, P being an integer greater than or equal to 1 and Q being an integer greater than P. the code words are selected in such a way that for information words of successive values the associated code words differ for only one bit. During recording an elementary mark (54) is formed on the record carrier for every bit of the first logic value. Moreover a read device for the record carrier thus obtained is described.
    Type: Grant
    Filed: May 5, 1988
    Date of Patent: May 29, 1990
    Assignee: U.S. Philips Corp.
    Inventors: Johannes J. Verboom, Constant P. M. J. Baggen, Cornelis M. J. Van Uijen, Erik W. Gaal