Patents by Inventor Junko Onaka

Junko Onaka 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).

  • Disk reproducing apparatus for precisely determining a value of an address signal reproduced from the disk
    Patent number: 6992956
    Abstract: A disk reproducing apparatus includes a variable gain amplifier (VCA) (32), and the VCA applies a radial push-pull signal including an address signal and an FCM leakage-in signal to a switch (38). The switch outputs only the address signal to a peak-hold circuit (40) on the basis of an FCM mask signal from a mask signal generation circuit (36). The peak-hold circuit generates a peak-hold signal of the address signal so as to be output to a DSP (30), and the DSP controls a gain of the VCA on the basis of the peak-hold signal. Then, the radial push-pull signal in which the gain is controlled on the basis of the address signal is applied to an address detection circuit (42), and the address signal is detected therein.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: January 31, 2006
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Shigekazu Minechika, Koichi Tada, Junko Onaka, Takashi Onaka
  • Disk reproducing device
    Publication number: 20040027944
    Abstract: A disk reproducing apparatus includes a variable gain amplifier (VCA) (32), and the VCA applies a radial push-pull signal including an address signal and an FCM leakage-in signal to a switch (38). The switch outputs only the address signal to a peak-hold circuit (40) on the basis of an FCM mask signal from a mask signal generation circuit (36). The peak-hold circuit generates a peak-hold signal of the address signal so as to be output to a DSP (30), and the DSP controls a gain of the VCA on the basis of the peak-hold signal. Then, the radial push-pull signal in which the gain is controlled on the basis of the address signal is applied to an address detection circuit (42), and the address signal is detected therein.
    Type: Application
    Filed: May 28, 2003
    Publication date: February 12, 2004
    Inventors: Shigekazu Minechika, Koichi Tada, Takashi Onaka, Junko Onaka