Patents by Inventor Hisaji Watanabe

Hisaji Watanabe 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).

  • Magnetic recording apparatus with recording of first and second sound signals
    Patent number: 4672468
    Abstract: A VTR is furnished with a phase-locked loop whose reference input is a color signal subcarrier. The phase-locked loop fixes two sound FM carrier frequencies in constant relationships with the frequency of the color signal subcarrier, thereby to stabilize the carrier frequencies. The two sound FM carrier frequencies are respectively selected to be integral times of f.sub.H /2 (where f.sub.H denotes the frequency of a horizontal synchronizing signal). The frequencies of the beats between both the sound carrier are fixed to integral times of f.sub.H /2, with the result that the degradation of a reproduced picture attributed to the beats is prevented.
    Type: Grant
    Filed: July 3, 1985
    Date of Patent: June 9, 1987
    Assignees: Hitachi Microcomputer Engineering Co., Ltd., Hitachi, Ltd.
    Inventors: Yoshinori Okada, Hisaji Watanabe, Isao Fukushima, Hideo Yoshida