Patents by Inventor Hiromasa Yamanaka

Hiromasa Yamanaka 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).

  • Double superheterodyne multichannel receiver with a phase-locked loop frequency synthesizer
    Patent number: 4027242
    Abstract: A double superheterodyne receiver having a single local oscillator which supplies a signal of a predetermined frequency to a second frequency converter or mixer, where a second intermediate frequency signal is produced for final detection. The local oscillator signal is also supplied via a frequency divider to a phase-locked loop frequency synthesizer as a reference frequency signal. The frequency synthesizer supplies to a first frequency converter or mixer a signal with a frequency selected in accordance with the incoming signal frequency to produce a first intermediate frequency signal, which is subsequently combined with the local oscillator signal in the second frequency converter to provide the second intermediate frequency signal. The invention is disclosed as adapted for a multichannel transceiver.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: May 31, 1977
    Assignee: Shinto Denki Co., Ltd.
    Inventor: Hiromasa Yamanaka