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/hal_st-2.7.6/audio/microphone/
DOpenPDMFilter.c40 uint32_t sinc1[DECIMATION_MAX]; variable
176 sinc1[i] = 1; in Open_PDM_Filter_Init()
186 convolve(sinc1, decimation, sinc1, decimation, sinc2); in Open_PDM_Filter_Init()
187 convolve(sinc2, decimation * 2 - 1, sinc1, decimation, &sinc[1]); in Open_PDM_Filter_Init()