Patents by Inventor Hisato Hirosaka

Hisato Hirosaka 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).

  • Automatic equalizer and digital signal reproducing apparatus carrying the same
    Patent number: 5805637
    Abstract: An automatic equalizer having a high convergence performance and broad pull and lock ranges. In converting playback signals into multi-level signals, a transversal filter output is processed with maximum likelihood decoding using a maximum likelihood decoder for calculating transmission errors and the coefficients of the transversal filter are again set based on the calculated errors.
    Type: Grant
    Filed: September 25, 1996
    Date of Patent: September 8, 1998
    Assignee: Sony Corporation
    Inventors: Hisato Hirosaka, Akio Tanaka