Patents by Inventor Masako Katoh

Masako Katoh 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).

  • Echo canceller
    Patent number: 5305309
    Abstract: An echo cancellor includes an echo replica generator which generates an echo replica signal based on a received signal, a subtractor which obtains a transmitting side output signal by subtracting the echo replica signal from a transmitting side input signal, a divergence detector which detects a divergence of the echo cancellor based on the transmitting side input signal and the echo replica signal and outputs a detection signal when the divergence is detected, and a resetting part which automatically resets the echo replica generator in response to the detection signal from the divergence detector.
    Type: Grant
    Filed: November 12, 1992
    Date of Patent: April 19, 1994
    Assignee: Fujitsu Limited
    Inventors: Kaoru Chujo, Masako Katoh