Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Electronic device
Process for the production of an acylation catalyst
Compounds with (1 E, 6E)-1,7-bis-(3,4-dimethoxyphenyl)-4,4-disubstituted-hepta-1,6-diene-3,5-d- ione structural scaffold, their biological activity, and uses thereof
Robot control device
Substituted phenylsulfur trifluoride and other like fluorinating agents
Global codebook for coordinated multi-point processing
Heat transfer label for decorating a metal container
  Randomly Featured Patents
Apparatus for making film laminated material
Method and apparatus to control overall write length in LED print bars
Remote execution of commands in a multi-host network
Immunoassay plates with desiccant housing
Apparatus for thermally testing an electronic device
Photographic elements containing new magenta dye-forming couplers
Pump and electronic device having the pump
Ammonium recovery from waste water using CO.sub.2 acidified absorption water
Projection television set
Pharmaceutical or dietetic mushroom-based compositions