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
Agents for preventing and treating disorders involving modulation of the ryanodine receptors
Display screen with graphical user interface
Compounds for nonsense suppression and methods for their use
Traffic signal mapping and detection
Electronic component
State detection device, electronic apparatus, measurement system and program
Communication network management system, method and program, and management computer
  Randomly Featured Patents
Method and system for updating a data system in conjunction with synchronized clock modules
Computer system having a data buffering system which includes a main ring buffer comprised of a plurality of sub-ring buffers connected in a ring
Control system and method for operating a transceiver
Germanium as an antireflective coating and method of use
Nonreciprocal circuit element
Die protection apparatus for a hydraulic press
Supplemental restraint system
RAS/P21 transgenic mouse
Device for controlling the manipulator movements in a forming machine, in particular in a hammer forging press
Grid recording for video-on-demand