Patent ID: 11900952
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. The audio signal decoding apparatus according to claim 9, wherein the first channel signal {circumflex over (x)}L′(n) and the second channel signal {circumflex over (x)}R′(n) are represented as follows:, [
   
    
     
      
       
        
         x
         ^
        
        L
        ′
       
       (
       n
       )
      
     
    
    
     
      
       
        
         x
         ^
        
        R
        ′
       
       ⁢
       
        (
        n
        )
       
      
     
    
   
   ]
  
  =
  
   {
   
    
     
      
       
        
         [
         
          
           
            
             
              
               x
               ^
              
              
               L
               ⁢
               _
               ⁢
               11
              
              ′
             
             (
             n
             )
            
           
          
          
           
            
             
              
               x
               ^
              
              
               R
               ⁢
               _
               ⁢
               11
              
              ′
             
             ⁢
             
              (
              n
              )
             
            
           
          
         
         ]
        
        ,
       
      
      
       
        
         if
         ⁢
            
         0
        
        ≤
        n
        <
        
         N
         1
        
       
      
     
     
      
       
        
         [
         
          
           
            
             
              
               x
               ^
              
              
               L
               ⁢
               _
               ⁢
               21
              
              ′
             
             (
             n
             )
            
           
          
          
           
            
             
              
               x
               ^
              
              
               R
               ⁢
               _
               ⁢
               21
              
              ′
             
             ⁢
             
              (
              n
              )
             
            
           
          
         
         ]
        
        ,
       
      
      
       
        
         if
         ⁢
            
         
          N
          1
         
        
        ≤
        n
        <
        
         N
         2
        
       
      
     
     
      
       
        
         [
         
          
           
            
             
              
               x
               ^
              
              
               L
               ⁢
               _
               ⁢
               31
              
              ′
             
             (
             n
             )
            
           
          
          
           
            
             
              
               x
               ^
              
              
               R
               ⁢
               _
               ⁢
               31
              
              ′
             
             ⁢
             
              (
              n
              )
             
            
           
          
         
         ]
        
        ,
       
      
      
       
        
         if
         ⁢
            
         
          N
          2
         
        
        ≤
        n
        <
        N
       
      
     
    
    ;, wherein
{circumflex over (x)}L_11′(n) represents the start segment signal of the third channel signal, {circumflex over (x)}R_11′(n) represents the start segment signal of the fourth channel signal, {circumflex over (x)}L_31′(n) represents the end segment signal of the third channel signal, {circumflex over (x)}R_31′(n) represents the end segment signal of the fourth channel signal, {circumflex over (x)}L_21′(n) represents the middle segment signal of the third channel signal, {circumflex over (x)}R_21′(n) represents the middle segment signal of the fourth channel signal, 0<N1<N2<N−1, n represents a sampling point number, and n=0, 1, . . . , N−1;
wherein, [
    
     
      
       
        
         
          x
          ^
         
         
          L
          ⁢
          _
          ⁢
          21
         
         ′
        
        (
        n
        )
       
      
     
     
      
       
        
         
          x
          ^
         
         
          R
          ⁢
          _
          ⁢
          21
         
         ′
        
        ⁢
        
         (
         n
         )
        
       
      
     
    
    ]
   
   =
   
    
     
      [
      
       
        
         
          
           
            x
            ^
           
           
            L
            ⁢
            _
            ⁢
            211
           
           ′
          
          (
          n
          )
         
        
       
       
        
         
          
           
            x
            ^
           
           
            R
            ⁢
            _
            ⁢
            211
           
           ′
          
          ⁢
          
           (
           n
           )
          
         
        
       
      
      ]
     
     *
     fade_out
     ⁢
     
      (
      n
      )
     
    
    +
    
     
      [
      
       
        
         
          
           
            x
            ^
           
           
            L
            ⁢
            _
            ⁢
            212
           
           ′
          
          (
          n
          )
         
        
       
       
        
         
          
           
            x
            ^
           
           
            R
            ⁢
            _
            ⁢
            212
           
           ′
          
          ⁢
          
           (
           n
           )
          
         
        
       
      
      ]
     
     *
     fade_in
     ⁢
     
      (
      n
      )
     
    
   
  
  ;
 

wherein fade_in(n) represents the fade-in factor, fade_out(n) represents the fade-out factor, a sum of fade_in(n) and fade_out(n) is 1; {circumflex over (x)}L_211′(n) represents the third temporary middle segment signal, {circumflex over (x)}R_211′(n) represents the fourth temporary middle segment signal, {circumflex over (x)}L_212′(n) represents the first temporary middle segment signal, and {circumflex over (x)}R_212′(n) represents the second temporary middle segment signal.