Recording/reproducing apparatus and recording/reproducing method

Abstract

A recording/reproducing apparatus comprising an OP head 11 , a wobble circuit 12 , a system controller 13 , and an address-decoding timing generator 14 . The wobble circuit 12 extracts a wobble signal from the signal the OP head 11 has read. A PLL circuit for generating a sync signal from the wobble signal is held while no normal wobble signal is generated. The address-decoding timing generator (Address DEC TG) 14 receives a signal the OP head 11 has reproduced, decodes the address represented by the signal, and supplies the address data to the system controller 13 . The generator 14 also generates a timing signal from the sync signal supplied from the wobble circuit 12 and supplies the timing signal to the other components of the recording/reproducing apparatus.

1 - 6 . (canceled)  
   
   
       7 . A recording/reproducing apparatus for recording and reproducing data on and from an optical disk that has an address data area having embossed pits and a recording/reproducing area having a wobbling spiral groove, said apparatus comprising: 
 head means for reading address data from the address data area and writing and reading a signal in and from the recording/reproducing area;    system controller means for controlling components of the recording/reproducing apparatus including servo circuit means, the system controller means controlling the servo circuit means for moving the head means to a desired address position on the optical disk; and    wobble-signal processing means for extracting a wobble signal from the signal the head means obtains from the wobbling spiral groove and for providing the wobble signal to a PLL circuit means for producing a sync signal from the wobble signal,    wherein the system controller means further produces a wobble enable signal when the system controller means controls switching of the recording/reproducing apparatus between at least one of recording and reproducing operations, said PLL circuit means further providing an unchanging sync signal in response to receiving the wobble enable signal.    
   
   
       8 . A recording/reproducing apparatus for recording and reproducing data on and from an optical disk that has an address data area having embossed pits and a recording/reproducing area having a wobbling spiral groove, said apparatus comprising: 
 head means for reading address data from the address data area and writing and reading a signal in and from the recording/reproducing area;    system controller means for controlling components of the recording/reproducing apparatus including servo circuit means, the system controller means controlling the servo circuit means for moving the head means to a desired address position on the optical disk; and    wobble-signal processing means for extracting a wobble signal from the signal the head means obtains from the wobbling spiral groove and for providing the wobble signal to a PLL circuit means for producing a sync signal from the wobble signal,    wherein the system controller means further produces a wobble enable signal when the system controller means controls the servo circuit means to move the head means to a desired address position on the optical disc, and said PLL circuit means further providing an unchanging sync signal in response to receiving the wobble enable signal.    
   
   
       9 . A recording/reproducing apparatus for recording and reproducing data on and from an optical disk that has an address data area having embossed pits and a recording/reproducing area having a wobbling spiral groove, said apparatus comprising: 
 head means for reading address data from the address data area and writing and reading a signal in and from the recording/reproducing area;    system controller means for controlling components of the recording/reproducing apparatus including servo circuit means, the system controller means controlling the servo circuit means for moving the head means to a desired address position on the optical disk; and    wobble-signal processing means for extracting a wobble signal from the signal the head means obtains from the wobbling spiral groove and for providing the wobble signal to a PLL circuit means for producing a sync signal from the wobble signal,    wherein the system controller means further produces a wobble enable signal when the wobble-signal processing means otherwise does not provide a wobble signal extracted from the signal the head means obtains from the wobbling spiral groove and provides the wobble enable signal to the PLL circuit means, said PLL circuit means further providing an unchanging sync signal in response to receiving the wobble enable signal.