Patents by Inventor Tomio Ohashi

Tomio Ohashi 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).

  • Test apparatus for an optical recording disc
    Patent number: 5274618
    Abstract: An optical recording disc on which an analog audio signal and a digital audio signal are recorded is tested. The analog audio signal results from FM-modulating 2-channel audio signals, and the digital audio signal results from modulating the same 2-channel audio signals in a digital fashion, in order to perform the test, a signal mixed with 2-channel audio signals resulting demodulating an analog audio signal and a signal mixed with 2-channel audio signals resulting from demodulating a digital audio signal are simultaneously reproduced by an electroacoustic transducer and evaluated.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: December 28, 1993
    Assignee: Sony Corporation
    Inventors: Fumiaki Henmi, Tomio Ohashi, Kunio Nakayama