Patents by Inventor Motoyuki Yoshizumi

Motoyuki Yoshizumi 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).

  • Headphone capable of directly converting digital audio signal into analog audio signal
    Patent number: 6141424
    Abstract: A headphone containing right/left-channel acoustic units capable of converting an analog audio signal into acoustic sounds. An input jack to which is supplied a digital audio signal derived from a digital audio appliance is provided within the headphone. A D/A converter for D/A-converting the digital audio signal supplied to the input jack into an analog audio signal, and an amplifier for amplifying the analog audio signal derived from the D/A converter to supply the amplified analog audio signal to the right/left-channel acoustic units, are provided in this headphone.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: October 31, 2000
    Assignee: Sony Corporation
    Inventors: Iwao Takiguchi, Motoyuki Yoshizumi