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/hal_st-2.7.6/audio/microphone/
DOpenPDMFilter.c41 uint32_t sinc2[DECIMATION_MAX * 2]; variable
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()