Analysis of individual results allowed for exploration of individual factors contributing to benefit received from NFC processing. Vowel recognition did not change significantly. Group level results provide evidence of significant improvement of consonant and plural recognition when NFC was enabled. These included speech sound detection, speech recognition, and self-reported preference measures. Multiple outcome measures were repeated using a modified withdrawal design. The participants were hearing-impaired adults (13) and children (11) with sloping, high-frequency hearing loss. This signal processor applies NFC above a cut-off frequency. This study evaluated prototype multichannel nonlinear frequency compression (NFC) signal processing on listeners with high-frequency hearing loss.
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