Patents Examined by Donna Ansetti
  • Digital player using a pulse width detector
    Patent number: 4562549
    Abstract: In a pulse width detector circuit, a high-level pulse width and a low-level pulse width of a digital signal derived by slicing an analog signal reproduced from a disc at a predetermined level are independently measured and maximum or minimum values thereof in a predetermined time interval are stored, and an average value, sum or difference of the maximum or minimum high-level pulse width and the maximum or minimum low-level pulse width is calculated to detect a correct pulse width of original data recorded on the disc.
    Type: Grant
    Filed: October 13, 1982
    Date of Patent: December 31, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Hiromichi Tanaka, Hiroyuki Kimura, Tsutomu Noda, Takao Arai, Masaharu Kobayashi, Shigeki Inoue