Resources Contact Us Home
Read signal processing circuit, read signal processing method, and optical disc drive

Image Number 10 for United States Patent #7446685.

The present invention provides a read channel and a drive capable of suppressing deterioration in performance of a PLL and a Viterbi decoder by using a DC component eliminating means capable of higher-speed operation than hitherto. The location of an edge is determined by using differential of a read signal, and a DC component is detected from the midpoint level of the edge. Detection of a pseudo-edge due to a long mark or space signal is prevented by limiting the absolute value of a maximum or minimum of a differential coefficient when the location of the edge is determined from the differential coefficient of the read signal. Internal operation of a DC component detector is controlled according to the state of the PLL and the magnitude of the DC component.

  Recently Added Patents
3D image generating method, 3D animation generating method, and both 3D image generating module and 3D animation generating module thereof
Electron-beam lithography method with correction of line ends by insertion of contrast patterns
Protecting a gaming machine from rogue code
Liquid crystal display
Female urine funnel
Control device
Apparatus and method for performing lawful intercept in group calls
  Randomly Featured Patents
Polymeric foam earplug
Detecting method for limit switch of optical disc drive by sampling voltage of limit switch predetermined times
Management method and a management system for volume
(20S)-1.alpha.-hydroxy-2.alpha.-methyl and 2.beta.-methyl-19-nor-vitamin D3 and their uses
Low out-gassing room temperature curable rubbery polymer, preparation thereof and device comprising same
Product for industrial radiography
Verbal warning systems and other audible warning systems for use with various types of devices, containers, products and other things
Method of manufacturing a semiconductor device including connecting a monocrystalline aluminum wire
Ceramic, heat insulation layer on metal structural part and process for its manufacture
Core section having asynchronous partial reset