Information reproduction apparatus, information carrier, and information recording apparatus

Abstract

An information reproduction apparatus of the present invention comprises a rotating section 2 for rotating an information carrier 1 on which a unit of continuous information capable of being continuously read out is recorded, a CLV control section 9 for controlling the rotating section in such a manner that the information carrier is rotated at a constant linear velocity, a CAV control section 9 for controlling the rotating section in such a manner that the information carrier is rotated at a constant angular velocity, a rotation control selection 14 for selectively operating the CLV or CAV control section, and an information determination section 14 for detecting an information length of the continuous information. The rotation control selection section is constructed in such a manner as to selectively operate the CLV or CAV control section based on a result of the detection of the information length of the continuous information.

1 . An information reproduction apparatus comprising: 
 a rotating section for rotating a disk-like information carrier on which moving image information is recorded;    a CAV control section for controlling the rotating section in such a manner that the information carrier is rotated at a constant angular velocity;    a reproduced signal processing section for reading out the moving image information from the information carrier and processing the moving image information; and    an information determination section for determining whether or not a type of information to be reproduced is moving image information,    wherein when the information determination section determines that the type of information to be reproduced is moving image information, the CAV control section controls the rotating section in such a manner that the information carrier is rotated at as low a number of revolutions as a level where a transfer rate required to reproduce information recorded in a most inner circumstance can be secured.    
   
   
       2 . An information reproduction apparatus according to  claim 1 , wherein the information determination section determines that the information to be reproduced is moving image information, when it is detected that an information length of information to be reproduced is greater than or equal to about 1 GB.  
   
   
       3 . An information reproduction apparatus according to  claim 1 , wherein the information determination section determines that the information to be reproduced is moving image information, when a command specialized in reading of moving image information is input.  
   
   
       4 . An information reproduction apparatus according to  claim 1 , wherein the information determination section determines that the information to be reproduced is moving image information, when it is verified that a regional code is recorded in the information carrier.  
   
   
       5 . An information reproduction apparatus according to  claim 1 , wherein the information determination section determines that the information to be reproduced is moving image information, when it is verified that defect management information is not registered in the information carrier.  
   
   
       6 . An information reproduction apparatus according to  claim 1 , wherein the information determination section determines that the information to be reproduced is moving image information, when it is verified that an extension of information to be reproduced indicates a MPEG or VOB file.  
   
   
       7 . An information reproduction apparatus according to  claim 1 , wherein the information determination section determines that the information to be reproduced is moving image information, when it is verified that information to be reproduced is restrained under a parental lock.  
   
   
       8 . An information reproduction apparatus according to  claim 1 , wherein the information determination section determines that the information to be reproduced is moving image information, when it is verified that authentication has been conducted so as to protect copyright.  
   
   
       9 . An information reproduction apparatus according to  claim 1 , further comprising: 
 a focusing section for focusing a light beam to the information carrier;    a focusing control section for controlling the light beam focused by the focusing section into a predetermined focus state;    a tracking control section for controlling the light beam focused by the focusing section in such a manner that the light beam correctly scans a track on the information carrier; and    a reproduced signal processing section for reproducing a signal read out from the information carrier.    
   
   
       10 . An information reproduction method comprising the steps of: 
 (a) rotating a disk-like information carrier on which moving image information is recorded;    (b) controlling the rotation of the information carrier in such a manner that the information carrier is rotated at a constant angular velocity;    (c) reading out the moving image information from the information carrier and processing the moving image information; and    (d) determining whether or not a type of information to be reproduced is moving image information,    wherein when it is determined in the step (d) that the type of information to be reproduced is moving image information, the rotation of the information carrier is controlled in such a manner that the information carrier is rotated at as low a number of revolutions as a level where a transfer rate required to reproduce information recorded in a most inner circumstance can be secured.    
   
   
       11 . An information reproduction method according to  claim 10 , wherein it is determined in the step (d) that the type of information to be reproduced is moving image information, when it is detected that an information length of information to be reproduced is greater than or equal to about 1 GB.  
   
   
       12 . An information reproduction method according to  claim 10 , wherein it is determined in the step (d) that the type of information to be reproduced is moving image information, when a command specialized in reading of moving image information is input.  
   
   
       13 . An information reproduction method according to  claim 10 , wherein it is determined in the step (d) that the type of information to be reproduced is moving image information, when it is verified that a regional code is recorded in the information carrier.  
   
   
       14 . An information reproduction method according to  claim 10 , wherein it is determined in the step (d) that the type of information to be reproduced is moving image information, when it is verified that defect management information is not registered in the information carrier.  
   
   
       15 . An information reproduction method according to  claim 10 , wherein it is determined in the step (d) that the type of information to be reproduced is moving image information, when it is verified that an extension of information to be reproduced indicates a MPEG or VOB file.  
   
   
       16 . An information reproduction method according to  claim 10 , wherein it is determined in the step (d) that the type of information to be reproduced is moving image information, when it is verified that information to be reproduced is restrained under a parental lock.  
   
   
       17 . An information reproduction method according to  claim 10 , wherein it is determined in the step (d) that the type of information to be reproduced is moving image information, when it is verified that authentication has been conducted so as to protect copyright.  
   
   
       18 . An information reproduction method according to  claim 10 , further comprising: 
 (e) focusing a light beam to the information carrier;    (f) controlling the light beam focused in the step (e) into a predetermined focus state;    (g) controlling the light beam focused in the step (e) in such a manner that the light beam correctly scans a track on the information carrier; and    (h) reproducing a signal read out from the information carrier.