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/hal_st-2.7.6/audio/microphone/
DOpenPDMFilter.c38 int64_t sub_const = 0; variable
195 sub_const = sum >> 1; in Open_PDM_Filter_Init()
196 div_const = sub_const * Param->MaxVolume / 32768 / FILTER_GAIN; in Open_PDM_Filter_Init()
246 Z = Param->Coef[1] + Z2 - sub_const; in Open_PDM_Filter_64()
294 Z = Param->Coef[1] + Z2 - sub_const; in Open_PDM_Filter_128()