Patents Represented by Attorney Andrew D. Fartney

Find this attorney in the Justia Lawyer Directory

  • Multimode filter
    Patent number: 6894956
    Abstract: A multimode filter in an optical storage device is used for filtering an error signal and outputting a frequency signal. The multimode filter comprises a CLV and CAV mode filter and a switch. The CLV mode filter is used for filtering the error signal and extracting a narrow bandwidth signal, whereas the CAV mode filter is used for filtering the error signal and extracting a wide bandwidth signal. The switch is used for selecting either the CLV mode filter or the CAV mode filter according to the recording mode of the optical storage device.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: May 17, 2005
    Assignee: Media Tek Inc.
    Inventors: Chi-Mou Chao, Hung-Jen Tseng