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/hal_st-2.7.6/audio/microphone/
DOpenPDMFilter.c39 uint32_t sinc[DECIMATION_MAX * SINCN]; variable
184 sinc[0] = 0; in Open_PDM_Filter_Init()
185 sinc[decimation * SINCN - 1] = 0; in Open_PDM_Filter_Init()
187 convolve(sinc2, decimation * 2 - 1, sinc1, decimation, &sinc[1]); in Open_PDM_Filter_Init()
190 coef[j][i] = sinc[j * decimation + i]; in Open_PDM_Filter_Init()
191 sum += sinc[j * decimation + i]; in Open_PDM_Filter_Init()