4.2.1 NR Suppression Level

Two selectable parameters for NR configurations are suppression levels for low frequency (<1000 Hz) and high frequency (from 1000-4000 Hz) (see Figure 4-2). The tunable range for both speaker and microphone paths are from 0-21 dB. However, in the DSP configuration tool, only the low-frequency NR suppression level is available, while the high-frequency suppression levels are determined empirically based on the field test results.