Patents by Inventor Keiji Egashira

Keiji Egashira 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).

  • Communication speed switching device
    Patent number: 6490056
    Abstract: It is decided whether or not the reception is performed with respect to signals of 1650 Hz, 1750 Hz and 185O Hz passed through band pass filter (BPF) 4031 up to 4033 and processed for the energy calculation in energy calculating circuit 4041 up to 4043 respectively. Low speed signals that are processed for the energy calculation in energy calculation circuit 4041 up to 4043 respectively are added in adding section 405. At this time, a timer in decision circuit 406 starts. When a predetermined time passes in the timer in decision circuit 406 with a predetermined energy level of signals of 1650 Hz, 1750 Hz and 1850 Hz kept, the signals are identified as EOP signal that comes after PIX signal. Thereby the apparatus is controlled to shift to the low speed signal reception mode.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: December 3, 2002
    Assignee: Matsushita Graphic Communication Systems, Inc.
    Inventors: Nobuhiko Noma, Keiji Egashira