Patents by Inventor Katsuhiro Sugiyama

Katsuhiro Sugiyama 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: 5317456
    Abstract: A reference signal is recorded in different locations on a record medium with a controllable recording current level that is changed when the reference signal is recorded in such different locations. Location signals representing those different locations at which the reference signal is recorded also are generated and they too are recorded. Thereafter, the reference and location signals are reproduced from the different locations and stored. The stored reference signal whose signal level is the largest is detected and the location signal representing the particular record medium location at which that reference signal was recorded is identified. The recording current level which was used to record the reference signal at that particular location is determined. This determined recording current level may be used subsequently to record a signal, such as a video signal, with optimum characteristics.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: May 31, 1994
    Assignee: Sony Corporation
    Inventor: Katsuhiro Sugiyama