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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3393 датащи(PDF) 44 Page - STMicroelectronics |
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AN3393 датащи(HTML) 44 Page - STMicroelectronics |
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44 / 103 page  State machine AN3393 44/103 DocID018750 Rev 4 Vrow = (45*a1+77*a2) / 256 where: - X, Y, Z are axes 8-bit measured raw input values. - a1 and a2 are temporary maximum 16-bit values, defined as follows: – a1 = abs(X)+abs(Y)+abs(Z) – a2 = max (abs(X), abs(Y), abs(Z)) - 45 and 77 are 8-bit fixed constants. The calculated vector (Vrow) can be filtered by a 7th-order FIR filter. 5.3.3 Vector filter The vector filter is a 7th-order anti-symmetric FIR filter. The transfer function of this filter is the following: Xv_filt = (x0- x7) coeff0 + (x1-x6) coeff1+ (x2-x5) coeff2 + (x3-x4) coeff3 where: coeff0 = VFC_4 (1Eh) register value; coeff1 = VFC_3 (1Dh) register value; coeff2 = VFC_2 (1Ch) register value; coeff3 = VFC_1 (1Bh) register value. Figure 6 shows the structure of the 7th-order anti-symmetric FIR filter. Figure 6. Vector filter AM14772V1 |
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