Patent ID: 11962995
Assignee: GUANGZHOU UNIVERSITY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. The virtual reproduction method for the multichannel spatial surround sound in three-dimensional space according to claim 1, wherein the filtering with the M/2 virtual reproduction signal processing functions Σ1,2, Σ3,4, . . . ΣM−1,M in the step 6, and the filtering with the M/2 virtual reproduction signal processing functions Δ1,2, Δ3,4 . . . ΔM−1,M in step 7 are carried out according to the virtual reproduction signal processing functions obtained by the following equations:, ∑
      
        m
        ,
        
          m
          +
          1
        
      
    
    ⁢
    
      =
      
        0.7
        ⁢
        0
        ⁢
        
          7
          ⁡
          
            [
            
              
                
                  A
                  1
                
                ⁡
                
                  (
                  
                    
                      θ
                      m
                    
                    ,
                    ω
                  
                  )
                
              
              +
              
                
                  A
                  1
                
                ⁡
                
                  (
                  
                    
                      θ
                      
                        m
                        +
                        1
                      
                    
                    ,
                    ω
                  
                  )
                
              
            
            ]
          
        
      
    
  

  
    
      Δ
      
        m
        ,
        
          m
          +
          1
        
      
    
    =
    
      
        0
        .
        7
      
      ⁢
      0
      ⁢
      
        7
        ⁡
        
          [
          
            
              
                A
                1
              
              ⁡
              
                (
                
                  
                    θ
                    m
                  
                  ,
                  ω
                
                )
              
            
            -
            
              
                A
                1
              
              ⁡
              
                (
                
                  
                    θ
                    
                      m
                      +
                      1
                    
                  
                  ,
                  ω
                
                )
              
            
          
          ]
        
      
    
  

  
    
      
        A
        1
      
      ⁡
      
        (
        
          
            θ
            m
          
          ,
          f
        
        )
      
    
    =
    
      
        
          (
          
            
              
                α
                1
              
              ⁢
              
                
                  H
                  L
                
                ⁡
                
                  (
                  
                    
                      θ
                      m
                    
                    ,
                    f
                  
                  )
                
              
            
            -
            
              
                β
                1
              
              ⁢
              
                
                  H
                  R
                
                ⁡
                
                  (
                  
                    
                      θ
                      m
                    
                    ,
                    f
                  
                  )
                
              
            
          
          )
        
        
          
            
              
                
                  
                    
                      
                      
                        
                          
                            α
                            1
                          
                          ⁢
                          
                            
                              H
                              L
                            
                            ⁡
                            
                              (
                              
                                
                                  θ
                                  m
                                
                                ,
                                f
                              
                              )
                            
                          
                        
                        -
                        
                          
                            β
                            1
                          
                          ⁢
                          
                            
                              H
                              R
                            
                            ⁡
                            
                              (
                              
                                
                                  θ
                                  m
                                
                                ,
                                f
                              
                              )
                            
                          
                        
                      
                      
                    
                    2
                  
                  +
                
              
            
            
              
                
                  
                    
                    
                      
                        
                          -
                          
                            β
                            1
                          
                        
                        ⁢
                        
                          
                            H
                            L
                          
                          ⁡
                          
                            (
                            
                              
                                θ
                                m
                              
                              ,
                              f
                            
                            )
                          
                        
                      
                      +
                      
                        
                          α
                          1
                        
                        ⁢
                        
                          
                            H
                            R
                          
                          ⁡
                          
                            (
                            
                              
                                θ
                                m
                              
                              ,
                              f
                            
                            )
                          
                        
                      
                    
                    
                  
                  2
                
              
            
          
        
      
      ⁢
      
        
          
          
            
              α
              1
              2
            
            -
            
              β
              1
              2
            
          
          
        
        
          
            α
            1
            2
          
          -
          
            β
            1
            2
          
        
      
    
  

wherein m=1, 2, . . . M,
wherein HL (θm, f) and HR (θm, f) are a pair of Head Related Transfer Functions (HRTFs) from virtual loudspeakers in a direction of azimuth θm of the horizontal plane to left and right ears, wherein f is a frequency; and α1=α1 (f) and β1=β1(f) are HRTFs from actual loudspeaker at horizontal left-front or right-front to the ipsilateral and contralateral ears, respectively.