Patents by Inventor Iwasaki Eiji

Iwasaki Eiji 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).

  • Multiplex signal processing apparatus
    Patent number: 4944032
    Abstract: A multiplex signal processing apparatus in a singal transmitting and receiving system includes at the transmitting side: a first amplitude-modulator for modulating a first carrier by a main signal to obtain a vestigial sideband, amplitude-modulated main signal; a second amplitude-modulator for modulating a second carrier which has the same frequency but differs in phase by 90.degree. from the first carrier by a multiplex signal to obtain a double sideband, amplitude-modulated multiplex signal; an inverse Nyquist filter for filtering this signal to obtain a vestigial sideband, amplitude-modulated multiplex signal; and an adder for adding the vestigial sideband, amplitude-modulated main and multiplex signals to obtain a multiplexed signal.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: July 24, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Sadashi Kageyama, Yoshio Abe, Yoshio Yasumoto, Shuji Inoue, Hitoshi Takai, Mitsujiro Matsumoto, Kouji Aono, Kiyoshi Uchimura, Iwasaki Eiji