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/hal_st-3.7.0/audio/microphone/
DOpenPDMFilter.c201 uint16_t c, d, s; in Open_PDM_Filter_Init() local
202 for (s = 0; s < SINCN; s++) in Open_PDM_Filter_Init()
204 uint32_t *coef_p = &coef[s][0]; in Open_PDM_Filter_Init()
207 lut[c][d][s] = ((c >> 7) ) * coef_p[d * 8 ] + in Open_PDM_Filter_Init()