Patents by Inventor Ikuo Hirama

Ikuo Hirama 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).

  • Publication number: 20040032532
    Abstract: A noise level detecting circuit that can stably detect a noise with respect to a video signal or the like on which a copy guard signal is superimposed is disclosed. A noise level detecting circuit (100) of one embodiment can include an A/D converter (1) that converts an analog video signal (S1) into a digital video signal (S4). A timing generating circuit (3) may generate a bust gate pulse (S3) that determines a period during which the burst signal of the analog video signal (S1) is extracted. An absolute value circuit (5) may convert an extracted burst signal (S6) into only a positive pole component on the basis of a pedestal level signal (S5). A delay circuit (6) may delay the burst signal (S7) of only the positive pole component by 1H unit. A comparator (7) may compare the burst signal (S7) of only the positive pole component with the delayed burst signal (S8). In this way, the noise may be stably detected.
    Type: Application
    Filed: August 7, 2003
    Publication date: February 19, 2004
    Inventors: Hiroshi Akiyama, Shoji Nakashima, Ikuo Hirama