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Frequency input/output function for the same representative participant as for Figure 3. The maximum audible frequency with restricted bandwidth (RBW) was 5000 Hz. The output frequency as a function of the input frequency with nonlinear frequency compression (NFC) is displayed for a 3.8 kHz start frequency and a 2.6 compression ratio. The maximum audible frequency with NFC for this listener was 8240 Hz.
