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RM0020 датащи(PDF) 55 Page - STMicroelectronics |
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RM0020 датащи(HTML) 55 Page - STMicroelectronics |
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55 / 69 page ![]() RM0020 Function API 55/69 Example 29. iir_frac16_casc #include "libdsp2.h" /* #pragma and ALIGN macros used to align to 4 bytes */ #ifdef __ghs__ #pragma alignvar (4) #endif ALIGN_DCC(4) short x[256/*+2*/] ALIGN_MWERKS(4); /* +2 to ensure there are 4 bytes of readable memory behind x */ #ifdef __ghs__ #pragma alignvar (4) #endif ALIGN_DCC(4) short y[256/*+2*/] ALIGN_MWERKS(4); /* +2 to ensure there are 4 bytes of readable memory behind y */ #ifdef __ghs__ #pragma alignvar (4) #endif ALIGN_DCC(4) short s[3*4] ALIGN_MWERKS(4) = {0,0,0,0,0,0,0,0,0,0,0,0}; short c[3*5] = {10763,21616,10854,2095,600, 8296,16593,8297,2413,5654, 14027,27934,13908,3270,19315,}; unsigned short N; void main(void) { /* filter the samples in x with sixth-order IIR filter, */ /* write result into y */ N = 256; iir_frac16_casc(N, x, y, c, s, 3); } 6.30 iir_frac16_2nd_hc - frac16 second-order IIR filter with half coefficients Function call: void iir_frac16_2nd_hc(unsigned short N, short *x, short *y, short *c, short *s); Arguments: dkkdkdkd Returns: |
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