Patent ID: 11881829
Assignee: AAC MICROTECH (CHANGZHOU) CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for audio peak reduction using an all-pass filter, comprising:
determining a delay parameter m and a gain parameter g based on a formula (1):, arg
        ⁢
        min
       
       
        m
        ,
        g
       
      
       
      
       max
       n
      
      
       
        ❘
        "\[LeftBracketingBar]"
       
       
        
         y
         
          m
          ,
          g
         
        
        (
        n
        )
       
       
        ❘
        "\[RightBracketingBar]"
       
      
     
     ,
    
   
   
    
     (
     1
     )
    
   
  
 

where absolute peak map, Y
    ⁡
    (
    
     m
     ,
     g
    
    )
   
   =
   
    
     max
     n
    
    
     
      ❘
      "\[LeftBracketingBar]"
     
     
      
       y
       
        m
        ,
        g
       
      
      (
      n
      )
     
     
      ❘
      "\[RightBracketingBar]"
     
    
   
  
  ,, ym,g(n) represents a processed signal with a time-domain response function and is calculated based on a formula (2):

ym,g(n)=(hs*x)(n)  (2),

where hs represents an impulse response function, x(n) represents an input signal, and hs is calculated based on a formula (3):, H
       S
      
      (
      z
      )
     
     =
     
      
       
        g
        +
        
         z
         
          -
          m
         
        
       
       
        1
        +
        
         gz
         
          -
          m
         
        
       
      
      .
     
    
   
   
    
     (
     3
     )