Ex parte ARAI et al. - Page 3




          Appeal No. 95-3916                                                          
          Application 08/008,292                                                      


               error flag memory means for storing the set of error flags             
          of said subsequent digital information signal on a code block               
          basis;                                                                      
               control means for controlling a read/write operation to said           
          memory means and said error flag memory means; and                          
               check means for comparing a set of check information codes             
          of said one digital information signal with a set of check                  
          information codes of said subsequent digital information signal             
          both stored in said memory means, on a check information code               
          basis;                                                                      
               wherein said control means writes correct code blocks and              
          corrected code blocks after error correction of said one digital            
          information signal at respective memory locations of said memory            
          means as well as the check information codes thereof in view of             
          the set of error flags stored in said error flag memory means for           
          said one digital information signal;                                        
               said control means then writes correct code blocks and                 
          corrected code blocks after error correction of said subsequent             
          digital information signal at respective memory location of said            
          memory means as well as the check information codes thereof in              
          view of the set of error flags stored in said error flag memory             
          means for said subsequent digital information signal, and                   
               said control means sets error flags for same code blocks of            
          said one and subsequent digital information signal in said error            
          flag memory means, where the error flags for both the same code             
          blocks stored in said error flag memory means indicate that the             
          same code blocks are correct or corrected code blocks, but a                
          comparison result by said check means indicates that the check              
          information codes of both the same code blocks do not coincide              
          with each other.                                                            
               The references relied on by the examiner are:                          
          Takagi et al. (Takagi)          4,742,517          May   3, 1988            
          Preissler                       4,918,694          Apr. 17, 1990            
               Claims 26 through 28 and 30 through 32 stand rejected under            
          35 U.S.C. § 103 as being unpatentable over Preissler.                       
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