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Download Example FIR filter coefficients Below are shown two filter designs for
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Example FIR filter coefficients Below are shown two filter designs for testing FIR filters. The assumption is that data words going into the filter are 12-bit 2's complement numbers and that coefficients are also 12-bit 2's complement signed numbers. An online FIR filter design tool was used to create these designs and can be found at: http://t-filter.engineerjs.com No claim is make that these are optimal designs, simple examples that can be used for demonstrating basic operation of a FIR filter. While a 16 tap filter will demonstrate basic filter operation, a 32 or 64 tap filter will allow sharper filter slopes and greater stop-band attenuation. A 16 tap band-pass filter, 50Khz sample rate 0-1000Hz stopband -29 db attenuation, i.e. output voltage 0.035 x Vin 2500-5500Hz passband -12.5 db attenuation, i.e. output voltage 0.24 x Vin 7000-25000Hz stopband -29 db attenuation Note that filter is fairly broad and there is significant attenuation in the pass-band. Coefficients are shown on the next page. Coefficients for the 16 tap bandpass filter: Decimal 357 -1413 -1048 -860 -440 182 807 1197 1197 807 182 -440 -860 -1048 -1413 357 Hex (signed 12 bit 2's complement) 165 A76 BE8 CA4 E48 0B6 327 4AD 4AD 327 0B6 E48 CA4 BE8 A76 165 A 32 tap bandpass filter, 3500-5500Hz pass band, 50Khz sample rate About 35 db attenuation in the stop bands, i.e. Vout = 0.0178 x Vin About 5 db attenuation in the pass band, i.e. Vout = 0.56 x Vin Coefficients for the 32 tap bandpass filter: Decimal -212 -84 42 258 484 597 490 131 -400 -918 -1203 -1095 -575 207 978 1454 1454 978 207 -575 -1095 -1203 -918 -400 131 490 597 484 258 42 -84 -212 Hex (signed 12 bit 2's complement) F2C FAC 0 2A 102 1E4 255 1EA 083 E70 C6A B4B 706 DC1 0CF 3D2 5AE 5AE 3D2 0CF DC1 706 B4B C6A E70 083 1EA 255 1E4 102 02A FAC F2C
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