Patents by Inventor Yoshihiko Fukumoto

Yoshihiko Fukumoto 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).

  • D/A conversion apparatus and A/D conversion apparatus
    Patent number: 5539403
    Abstract: It purposes to provide a D/A conversion apparatus of a high accuracy oversampling method by noise shaping which is not needed a high frequency clock or accurate working, and a high accuracy A/D conversion apparatus having a configuration to which said D/A conversion technology is applied. It has configuration outputting the digital signal by dividing to plural 1-bit D/A converters, and by using said D/A converters so as to circulate, correlation of the signal and the output value of a specified 1-bit D/A converter is canceled, and noise or distortion due to a relative error of the 1-bit D/A converter is reduced.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: July 23, 1996
    Assignee: Matsushita Electric Industrial Co, Ltd
    Inventors: Yasunori Tani, Tetsuhiko Kaneaki, Akira Sobajima, Hideaki Hatanaka, Yoshihiko Fukumoto