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/linux-4.19.296/drivers/isdn/hardware/eicon/
Dcapidtmf.c494 word low_peak, high_peak; in capidtmf_recv_block() local
573 low_peak = DSPDTMF_RX_SENSITIVITY_LOW_DEFAULT; in capidtmf_recv_block()
577 if (goertzel_result_buffer[i] > low_peak) in capidtmf_recv_block()
579 low_peak = goertzel_result_buffer[i]; in capidtmf_recv_block()
594 if (low_peak + DSPDTMF_RX_HIGH_EXCEEDING_LOW_DEFAULT < high_peak) in capidtmf_recv_block()
596 if (high_peak + DSPDTMF_RX_LOW_EXCEEDING_HIGH_DEFAULT < low_peak) in capidtmf_recv_block()
601 … if ((((short)(low_peak - goertzel_result_buffer[i] - capidtmf_recv_guard_snr_low_table[i])) < 0) in capidtmf_recv_block()