Patent ID: 11886996
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. The training data augmentation device according to claim 3, wherein:
the first observation signal is based on a signal observed by first-order Ambisonics;
the operation of rotation in the azimuth angle direction is an operation of rotation of an azimuth angle from ac, t to ac, t+θ;
the operation of rotation in the elevation angle direction is an operation of rotation of an elevation angle from ec, t to ec, t+φ;
the first observation signal includes Kt, f=(Dt, f(X), Dt, f(Y), Dt, f(Z))T;
the azimuth angle-rotated signal includes Kt, fθ=RθKt, f in which, R
    θ
   
   =
   
    [
    
     
      
       
        cos
        ⁢
        θ
       
      
      
       
        
         -
         s
        
        ⁢
        in
        ⁢
        θ
       
      
      
       0
      
     
     
      
       
        sin
        ⁢
        θ
       
      
      
       
        cos
        ⁢
        θ
       
      
      
       0
      
     
     
      
       0
      
      
       0
      
      
       1
      
     
    
    ]
   
  
  ;
 

 and
the second observation signal includes Kt, fθ·cosφ+cross(u, Kt, fθ)sinφ+u·dot(u, Kt, fθ)(1−cosφ) in which u=(sin(ac, t+θ), cos(ac, t+φ),0)T, cross (a, b) is an outer product of a and b, dot(a, b) is an inner product of a and b and aT is a transpose of a.