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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8983GEFL/V датащи(PDF) 42 Page - Wolfson Microelectronics plc |
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WM8983GEFL/V датащи(HTML) 42 Page - Wolfson Microelectronics plc |
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42 / 124 page  WM8983 Production Data w PD, Rev 4.3, May 2010 42 NOTCH FILTER WORKED EXAMPLE The following example illustrates how to calculate the a0 and a1 coefficients for a desired centre frequency and -3dB bandwidth. Fc = 1000 Hz fb = 100 Hz fs = 48000 Hz rads s f c f w 1308996939 . 0 48000 1000 2 2 0 = = = π π rads s f b f b w 9 0130899693 . 0 48000 100 2 2 = = = π π 9869949627 0 2 9 0130899693 0 tan 1 2 9 0130899693 0 tan 1 2 tan 1 2 tan 1 0 . ) / . ( ) / . ( ) / b (w ) / b (w a = + − = + − = 969995945 . 1 ) 1308996939 . 0 cos( ) 9869949627 . 0 1 ( ) 0 cos( ) 0 1 ( 1 − = + − = + − = w a a NFA0 = -a0 x 2 13 = -8085 (rounded to nearest whole number) NFA1 = -a1 x 2 12 = 8069 (rounded to nearest whole number) These values are then converted to a 2’s complement notation: NFA0[13:0] = 14’h1F95; Converting to 2’s complement NFA0 = 14’h4000 – 14’h1F95 = 14’h206B NFA1[13:0] = 14’h1F85; Converting to 2’s complement NFA0 = 14’h1F85 |
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