Information processing device, information processing method, and program

Abstract

Provided are a device and a method which are capable of performing crosstalk-removed high-quality data reproduction from a high-density recording type optical disc. The device includes a photo detector that outputs a readout signal from a reproduction track of an information recording disc, an adjacent track reproduction binary signal supply unit that outputs a binary signal (binary data) which is a reproduction signal of an adjacent track of the reproduction track, a multi-input adaptive equalizer that includes an equalizer unit that receives the readout signal from the reproduction track and an adjacent track reproduction binary signal and outputs an equalization signal by an adaptive equalization process based on an input signal, and a binarization processing unit that executes a binarization process based on the equalization signal and generates a reproduction signal of the reproduction track.

1 . An information processing device, comprising:
 a photo detector that outputs a readout signal from a reproduction track of an information recording disc; and   circuitry configured to:
 obtain a binary signal (binary data) from a reproduction signal of an adjacent track of the reproduction track; 
 perform an adaptive equalization process on the readout signal and the adjacent track reproduction binary signal; 
 obtain an equalization signal, based on an input signal, by adding results of the adaptive equalization process performed on the readout signal and the adjacent track reproduction binary signal; and 
 execute a binarization process based on the equalization signal, and generate a reproduction signal of the reproduction track. 
   
     
     
         2 . The information processing device according to  claim 1 , wherein the circuitry is further configured to:
 obtain a binary signal (binary data) of at least one adjacent track of the reproduction track.   
     
     
         3 . The information processing device according to  claim 1 , wherein the circuitry is further configured to:
 obtain binary signals (binary data) of two adjacent tracks of the reproduction track.   
     
     
         4 . The information processing device according to  claim 1 , wherein the circuitry is further configured to:
 generate an adjacent track reproduction binary signal based on a read signal of an adjacent track read via an optical pickup.   
     
     
         5 . The information processing device according to  claim 1 , wherein the circuitry is further configured to:
 acquire an adjacent track reproduction binary signal previously stored in a record data storage memory from the record data storage memory.   
     
     
         6 . The information processing device according to  claim 1 , further comprising:
 a memory that stores the adjacent track reproduction binary signal; and   a memory controller that executes data input control on the multi-input adaptive equalizer from the memory.   
     
     
         7 . The information processing device according to  claim 6 , wherein the memory controller executes data input control of simultaneously inputting a readout signal from the reproduction track and an adjacent track reproduction binary signal at a position nearest to the readout signal to the multi-input adaptive equalizer. 
     
     
         8 . The information processing device according to  claim 1 , wherein the photo detector is a multi-signal output type photo detector that outputs a plurality of signals corresponding to an amount of received light of a split region, and
 wherein the circuitry is further configured to:
 perform an adaptive equalization process on the plurality of signals output from the photo detector and an adjacent track reproduction binary signal; and 
 obtain an equalization signal by the adaptive equalization process based on an input signal. 
   
     
     
         9 . The information processing device according to  claim 8 , wherein the photo detector is a multi-signal output type photo detector that has a plurality of split regions along a track direction (tangential direction) and outputs a plurality of signals corresponding to the amount of received light of each split region of the plurality of split regions. 
     
     
         10 . The information processing device according to  claim 8 , wherein the photo detector is a multi-signal output type photo detector that has a plurality of split regions along a disc radial direction (radial direction) and outputs a plurality of signals corresponding to the amount of received light of each split region of the plurality of split regions. 
     
     
         11 . The information processing device according to  claim 1 , wherein the circuitry is further configured to:
 receive an output of the photo detector;   generate a plurality of signals corresponding to an amount of received light of a split region unit of the photo detector;   perform an adaptive equalization process on the plurality of signals and an adjacent track reproduction binary signal; and   obtain an equalization signal by the adaptive equalization process based on the input signal.   
     
     
         12 . The information processing device according to  claim 1 , wherein the circuitry is further configured to:
 execute a partial response equalization process based on the input signal; and   execute a maximum likelihood decoding process as the binarization process for the equalization signal.   
     
     
         13 . The information processing device according to  claim 1 , wherein the circuitry is further configured to:
 generate an equalization target signal based on the binary signal;   calculate an equalization error from the equalization target signal and the equalization signal output from the multi-input adaptive equalizer; and   execute an adaptive equalization process based on the equalization error.   
     
     
         14 . The information processing device according to  claim 1 ,
 wherein the information recording disc is a disc in which data recording is performed on both a land and a groove, and   wherein the reproduction track and the adjacent track are a combination of a land track and a groove track.   
     
     
         15 . The information processing device according to  claim 1 , further comprising:
 a configuration that executes data reproduction in parallel from the adjacent track;   a first photo detector that outputs a readout signal from a first reproduction track of the information recording disc;   a second photo detector that outputs a readout signal from a second reproduction track adjacent to the first reproduction track; and   a decoder that generates a binary signal (binary data) serving as a reproduction signal of the first reproduction track and a binary signal (binary data) serving as a reproduction signal of the second reproduction track,   wherein the circuitry is further configured to:
 receive the readout signal from the first reproduction track and the binary signal serving as the reproduction signal of the second reproduction track generated by the decoder; 
 obtain an equalization signal by an adaptive equalization process performed on the readout signal from the first reproduction track and the binary signal serving as the reproduction signal of the second reproduction track, based on an input signal; 
 receive the readout signal from the second reproduction track and the binary signal serving as the reproduction signal of the first reproduction track generated by the decoder; 
 obtain an equalization signal by an adaptive equalization process performed on the readout signal from the second reproduction track and the binary signal serving as the reproduction signal of the first reproduction track, based on an input signal; 
 execute a binarization process based on the equalization signal obtained by the adaptive equalization process performed on the readout signal from the first reproduction track and the binary signal serving as the reproduction signal of the second reproduction track and generate a first track compatible reproduction binary signal; and 
 execute a binarization process based on the equalization signal obtained by the adaptive equalization process performed on the readout signal from the second reproduction track and the binary signal serving as the reproduction signal of the first reproduction track and generate a second track compatible reproduction binary signal. 
   
     
     
         16 . An information processing method executed in an information processing device, the method comprising:
 outputting, by a photo detector, a readout signal from a reproduction track of an information recording disc;   obtaining a binary signal (binary data) from a reproduction signal of an adjacent track of the reproduction track;   performing an adaptive equalization process on the readout signal from the reproduction track and the adjacent track reproduction binary signal;   obtaining an equalization signal, based on an input signal, by adding results of the adaptive equalization process performed on the readout signal and the adjacent track reproduction binary signal; and   executing a binarization process based on the equalization signal and generate a reproduction signal of the reproduction track.   
     
     
         17 . A non-transitory computer-readable medium having embodied thereon a program, which when executed by a computer causes the computer to execute an information processing method, the method comprising:
 outputting, by a photo detector, a readout signal from a reproduction track of an information recording disc;   obtaining a binary signal (binary data) from a reproduction signal of an adjacent track of the reproduction track;   performing an adaptive equalization process on the readout signal from the reproduction track and the adjacent track reproduction binary signal;   obtaining an equalization signal, based on an input signal, by adding results of the adaptive equalization process performed on the readout signal and the adjacent track reproduction binary signal; and   executing a binarization process based on the equalization signal and generate a reproduction signal of the reproduction track.