Patent ID: 11922964
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 2:
3. The PSD optimization device according to claim 1,
wherein, with uBN,τ as a variable representing the background noise PSD at a time frame τ, and {circumflex over ( )}φBN,τ−1 as a background noise PSD estimation value at time frame τ−1,
a convex cost term L relating to the temporal structure is defined by, L
   ⁡
   (
   
    u
    
     BN
     ,
     τ
    
   
   )
  
  =
  
   
    
     γ
     BN
    
    2
   
   ⁢
   
    
     
     
      
       
        φ
        ^
       
       
        BN
        ,
        
         τ
         -
         1
        
       
      
      -
      
       u
       
        BN
        ,
        τ
       
      
     
     
    
    2
    2
   
  
 

where γBN (∈R+) is a weighting coefficient.