Patents by Inventor Noboru Tahara

Noboru Tahara 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).

  • Television transmitter employing klystron with nonlinearity correction circuit
    Patent number: 4905086
    Abstract: A television transmitter includes a klystron power amplifier, a non-linearity pre-correction circuit in a stage preceding the klystron power amplifier, a non-linearity detection circuit for detecting the non-linearity of the output of the klystron power amplifier, a first level controlling circuit for controlling the level of the output of the non-linearity pre-correction circuit in response to the output of the non-linearity detection circuit, a hum frequency component detection circuit for detecting a hum frequency component of the output of the klystron power amplifier and a second level controlling circuit for controlling the level of either the input or the output of the non-linearity pre-correction circuit in response to the detected hum frequency component. The first and second level controlling level circuits are preferably variable attenuators.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: February 27, 1990
    Assignee: NEC Corporation
    Inventor: Noboru Tahara