Patents by Inventor Jan Drupsteen

Jan Drupsteen 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).

  • Fourth-order digital multiplex system for transmitting a plurality of digital signals at a nominal bit rate of 44 736 kbit/s
    Patent number: 4535451
    Abstract: The CCITT has given recommendations for two types of hierarchies of PCM multiplex systems for telephony transmission: a first type based on a first-order PCM multiplex system having a nominal bit rate of 2048 kbit/s for 30 telephone channels while employing the A-law, and a second type based on a first-order PCM multiplex system having a nominal bit rate of 1544 kbit/s for 24 telephone channels while employing the .mu.-law.The fourth-order digital multiplex system in accordance with the invention comprises a transmitter (1) having a digital multiplexer (7) arranged for cyclically bit-wise interleaving three digital signals having nominal bit rates of 44 736 kbit/s, the third order in the second type of PCM multiplex hierarchy, into a composite digital signal having a nominal bit rate of 139 264 kbit/s, the fourth order in the first type of PCM multiplex hierarchy, and having a specific frame structure (a in FIG.
    Type: Grant
    Filed: February 11, 1983
    Date of Patent: August 13, 1985
    Assignee: U.S. Philips Corporation
    Inventor: Jan Drupsteen