Patent ID: 11889121
Assignee: ALIBABA GROUP HOLDING LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The method according to claim 1, wherein the cosine windowed-sinc function is, f
    ⁡
    (
    n
    )
   
   =
   
    
     
      f
      ⁢
      c
     
     r
    
    ⁢
    
     
      Sin
      ⁢
      c
     
     (
     
      
       
        f
        ⁢
        c
       
       r
      
      ⁢
      n
     
     )
    
    ⁢
    
     cos
     ⁡
     (
     
      
       π
       ⁢
       n
      
      
       L
       -
       1
      
     
     )
    
   
  
  ,, wherein, n
   =
   
    -
    
     
      L
      -
      1
     
     2
    
   
  
  ,
  
   .
    
   .
    
   .
  
     
  ,
  
   
    L
    -
    1
   
   2
  
  ,, wherein fc is a cutoff frequency of the cosine windowed-sinc function, L is a kernel length, and r is a downsampling ratio.