Patents by Inventor Hiroyuki Tsukuda

Hiroyuki Tsukuda 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 device having relaying and switching function
    Patent number: 5301190
    Abstract: In a communication device having a transmission device connected to first and second transmission paths, and an exchange connected to the transmission device, the transmission device includes a codec and a switching part. When a speech signal received from the first transmission path terminates at a terminal accommodated in the exchange, the speech signal having a low bit rate is converted, by the codec, into a bit rate which can be processed by the exchange, and then sent to the exchange. Meanwhile, when the speech signal received from the first transmission path is relayed to the second transmission path, the speech signal having the low bit rate is sent to the second transmission path via the switching part without passing it through the codec while the bit rate of the speech signal is maintained.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: April 5, 1994
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Tsukuda, Yoshiya Iribe