Patents by Inventor Walter C. Y. Yeh

Walter C. Y. Yeh 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).

  • Electronic tone generator for generating a main melody, a first accompaniment, and a second accompaniment
    Patent number: 4876936
    Abstract: An electronic tone generator generates a synthesized three tones signal of a main melody tone, a first accompaniment tone, and a second accompaniment tone. The electronic tone generator includes a main melody generation circuit, a first accompaniment circuit, and a second accompaniment circuit, each equipped with its own envelope circuit. A ROM is provided having stored therein information concerning key activation, tempo, melody, notes and timings. A mixing modulator synthesizes the signals output from the main melody generation circuit, the first accompaniment circuit, and the second accompaniment circuit.
    Type: Grant
    Filed: May 9, 1988
    Date of Patent: October 31, 1989
    Inventor: Walter C. Y. Yeh