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
Real-time pricing of shipping vendors
Garden tool handle
Three-dimensional holographic display using active shutter
Image forming apparatus and job request control method instructed by authenticated users
Cosmetic product including vegetable oil blend
Separate matching models based on type of phone associated with a caller
Format for providing traffic information and a method and apparatus for using the format
  Randomly Featured Patents
Imaging apparatus having a zoom function
Sound image enhancing
Hydrometallurgical treatment of metallurgical dust
Water-dispersible copolyester-ether compositions
Body for a portable heater
Priority based bandwidth allocation within real-time and non-real-time traffic streams
System for monitoring caregivers and equipment at a patient location
High speed semiconductor waveguide phase-shifter