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/linux-4.19.296/drivers/isdn/mISDN/
Ddsp_dtmf.c128 s64 cos2pik_; in dsp_dtmf_goertzel_decode() local
189 cos2pik_ = cos2pik[k]; in dsp_dtmf_goertzel_decode()
191 sk = ((cos2pik_ * sk1) >> 15) - sk2 + (*buf++); in dsp_dtmf_goertzel_decode()