Patent ID: 11890096
Assignee: CIVIL AVIATION UNIVERSITY OF CHINA
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 4:
5. The method according to claim 1, wherein in step 5), a value of each frequency in each group of frequency combinations is determined by the following formula:

fj,i=F0+Δf′(j−1)+Δf(j−1),f1,B+1=F1 

where fj,i refers to a value of the i-th frequency, from low to high, in the frequency combination obtained by the j-th 8-shaped digital frame, a value of i ranges from 1 to B, and a value of j ranges from 1 to N; F0 is a lower limit of a measurement range for each round, F1 is an upper limit of the measurement range for each round, the measurement range is represented by F0 to F1; an initial measurement range is from 20 Hz to 50 Hz; and Δf′ is a difference between minimum frequencies of the frequency combinations obtained by two adjacent 8-shaped digital frame, and a value of Δf′ is determined by the following formula:, Δ
    ⁢
    
      
    
    ⁢
    
      f
      ′
    
  
  =
  
    
      (
      
        
          F
          1
        
        -
        
          F
          0
        
      
      )
    
    
      
        B
        a
      
      -
      1
    
  

where Ba is a sum of numbers of all different frequencies included in the N groups of the frequency combinations obtained by the N 8-shaped digital frames, and the value of Ba is determined by the following formula:, B
    a
  
  =
  
    
      ∑
      i
      N
    
    ⁢
    
      B
      j
    
  

where Bj is a number of different frequencies in the frequency group obtained by the j-th 8-shaped digital frame, and a value of Bj is determined by the following formula:

B2=B3= . . . =BN=B,B1=B+1

where Δf is a difference between adjacent frequencies in the frequency combination obtained in the same 8-shaped digital frame, and a value of Δf is determined by the following formula:

Δf=N*Δf′

where f1, B+1 is a highest frequency value in the frequency combination obtained by the first 8-shaped digital frame.