Optical storage medium having multiple recording layers of different formats

Abstract

A disc recording medium has recorded thereon a first program in a first recording area and corresponding first management data for managing readout of the first program and providing information, such as track number and play time, to the user. The disc recording medium also has a second program recorded in a second recording area and corresponding second management data for managing readout of the second program. The second management data includes only an absolute time code and track start time codes, but no track numbers or play times, and the track numbers are derived using the second management data.

1. A disc recording medium having two layers, wherein a first layer comprises:
 a first program area for recording at least one program having a program number and a running time corresponding to each program recorded therein, wherein each program is encoded according to a first format; and  
 a first management area for recording management data for managing an absolute time corresponding to each program recorded in said first program area;  
 wherein a second layer comprises: 
 a second program area for recording at least one program having only absolute time without a program number and a running time, wherein each program is encoded according to a second format; and  
 a second management area for recording management data for managing an absolute start time and for use in calculating a program number corresponding to each program in said second program area.  
 
 
     
     
       2. The disc recording medium according to  claim 1 , wherein said program recorded in said first program area of said first layer comprises PCM digital audio information. 
     
     
       3. The data recording medium according to  claim 1 , wherein said program recorded in said second program area of said second layer comprises 1-bit digital audio information. 
     
     
       4. A disc recording medium comprising:
 a program area for recording therein at least one program and an absolute time without a program number and for recording therein  without a running time corresponding to each program; and  
 a management area for recording therein data for managing an absolute start time for each program and for calculating a program number corresponding to each program recorded in the program area.  
 
     
     
       5. The disc recording medium according to  claim 4 , wherein the program is modulated by ΔΣ modulation.