Patents by Inventor Kasuke Iwafune

Kasuke Iwafune 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).

  • Patent number: 4641206
    Abstract: A video signal recording and reproducing apparatus comprises a circuit for recording an FM recording video signal onto a recording medium, a demodulator for reproducing and demodulating the recorded signal from the recording medium back into the original video signal, a noise reduction circuit for reducing a noise component in the reproduced video signal. The noise reduction circuit has a first delay circuit for delaying the reproduced video signal by one horizontal scanning period (1H), a first differential amplifier supplied with the reproduced video signal and with a 1H delayed reproduced video signal, a first limiter for amplitude-limiting an output of the first differential amplifier, and a subtracting circuit for performing a subtraction between the reproduced video signal and an output of the first limiter.
    Type: Grant
    Filed: February 29, 1984
    Date of Patent: February 3, 1987
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Kasuke Iwafune