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/hal_st-2.7.6/audio/microphone/
DOpenPDMFilter.c224 int64_t Z, Z0, Z1, Z2; in Open_PDM_Filter_64() local
246 Z = Param->Coef[1] + Z2 - sub_const; in Open_PDM_Filter_64()
250 OldOut = (Param->HP_ALFA * (OldOut + Z - OldIn)) >> 8; in Open_PDM_Filter_64()
251 OldIn = Z; in Open_PDM_Filter_64()
254 Z = OldZ * volume; in Open_PDM_Filter_64()
255 Z = RoundDiv(Z, div_const); in Open_PDM_Filter_64()
256 Z = SaturaLH(Z, -32700, 32700); in Open_PDM_Filter_64()
258 dataOut[data_out_index] = Z; in Open_PDM_Filter_64()
272 int64_t Z, Z0, Z1, Z2; in Open_PDM_Filter_128() local
294 Z = Param->Coef[1] + Z2 - sub_const; in Open_PDM_Filter_128()
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