Optical disc recording and reproducing apparatus

Abstract

An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.

1 - 18 . (canceled) 
   
   
       19 . An optical disc reproducing method comprising:
 extracting information indicating an address area or a data area from a signal read from an optical disc, in an analog processing system; and   generating, on the basis of the extracted information, a signal instructing the analog processing step to be either a processing that depends on the address area or a processing that depends on the data area, when smooth reading from the optical disc cannot be carried out.   
   
   
       20 . An optical disc reproducing method comprising:
 extracting information indicating an address area or a data area from a signal read from an optical disc, in an analog processing system; and   generating, immediately after reading of a signal from the optical disc has started, a signal instructing the analog processing step to be either a processing that depends on the address area or a processing that depends on the data area, on the basis of the extracted information.   
   
   
       21 . An optical disc reproducing apparatus comprising:
 a unit operable to extract information indicating an address area or a data area from a signal read from an optical disc, in an analog processing system; and   a unit operable to generate, on the basis of the extracted information, a signal instructing the analog processing step to be either a processing that depends on the address area or a processing that depends on the data area, when smooth reading from the optical disc cannot be carried out.   
   
   
       22 . An optical disc reproducing apparatus comprising:
 a unit operable to extract information indicating an address area or a data area from a signal read from an optical disc, in an analog processing system; and   a unit operable to generate, immediately after reading of a signal from the optical disc has started, a signal instructing the analog processing step to be either a processing that depends on the address area or a processing that depends on the data area, on the basis of the extracted information.   
   
   
       23 . An optical disc reproducing apparatus for performing reproduction of data recorded on an optical disc, comprising:
 an analog processing unit including a binarization unit operable to perform binarization for a signal that is read from the optical disc, and a servo unit operable to control signal reproduction from the optical disc;   a unit operable to extract information indicating an address area or a data area from the signal that is read from the optical disc, in the analog processing unit; and   a unit operable to generate, when smooth reading of the signal from the optical disc cannot be carried out, a gate signal for controlling the analog processing unit, on the basis of the extracted information.   
   
   
       24 . An optical disc reproducing apparatus as defined in  claim 27 . wherein
 said analog processing unit further includes a unit operable to perform a change of processing based on a difference in reflectivities or a difference in recording states between the address area and the data area of the optical disc; and   the gate signal for controlling the analog processing unit is a gate signal instructing the change of processing.   
   
   
       25 . An optical disc reproducing apparatus for performing reproduction of data recorded on an optical disc, comprising:
 an analog processing unit including a binarization unit operable to perform binarization for a signal that is read from the optical disc, and a servo unit operable to control signal reproduction from the optical disc;   a unit operable to extract information indicating an address area or a data area from the signal that is read from the optical disc, in the analog processing unit; and   a unit operable to generate, immediately after reading of a signal from the optical disc has started, a gate signal for controlling the analog processing unit, on the basis of the extracted information.   
   
   
       26 . An optical disc reproducing apparatus as defined in  claim 29  wherein
 said analog processing unit further includes a unit operable to perform a change of processing based on a difference in reflectivities or a difference in recording states between the address area and the data area of the optical disc; and   the gate signal for controlling the analog processing unit is a gate signal instructing the change of processing.   
   
   
       27 . An optical disc reproducing method for performing reproduction of data recorded on an optical disc, comprising:
 an analog processing step including a binarization process for performing binarization for a signal that is read from the optical disc, and a servo control process for controlling signal reproduction from the optical disc;   a step of extracting information indicating an address area or a data area from the signal that is read from the optical disc, in the analog processing step; and   a step of generating, when smooth reading of the signal front the optical disc cannot be carried out, a gate signal for controlling the analog processing step, on the basis of the extracted information.   
   
   
       28 . An optical disc reproducing method as defined in claim  31 . wherein
 said analog processing step further includes a step of performing a change of processing based on a difference in reflectivities or a difference in recording states between the address area and the data area of the optical disc and   the gate signal for controlling the analog processing step is a gate signal instructing the change of processing.   
   
   
       29 . An optical disc reproducing method for performing reproduction of data recorded on an optical disc, comprising:
 an analog processing step including a binarization process for performing binarization for a signal that is read from the optical disc, and a servo control process for controlling signal reproduction from the optical disc;   a step of extracting information indicating an address area or a data area from the signal that is read from the optical disc, in the analog processing step; and   a step of generating, immediately after reading of a signal from the optical disc has started, a gate signal for controlling the analog processing step, on the basis of the extracted information.   
   
   
       30 . An optical disc reproducing method as defined in claim  33  wherein
 said analog processing step further includes a step of performing a change of processing based on a difference in reflectivities or a difference in recording states between the address area and the data area of the optical disc; and   the gate signal for controlling the analog processing step is a gate signal instructing the change of processing.