Nonlinear Frequency Compression (NFC) is one successful approach to compensate for the deterioration of speech perception associated with reduced high frequency cues. Two studies evaluated the effect of NFC on sound detection and both found that detection was better with NFC than without it while other studies investigated the effect of NFC on consonant recognition and found it to be significantly better when NFC was enabled. The effects of NFC on speech perception in noise seem to be unclear. Some studies that assessed this outcome found no significant difference in performance with NFC active and inactive at a group level while Bohnert et al. reported that seven out of 11 participants had improved speech recognition in noise with the use of NFC but did not indicate whether these improvements were statistically significant. Simpson et al. also found a significant improvement for speech in noise with NFC but only tested five subjects and one subject showed a large improvement which accounted for the mean improvement.
Citation: Uys M, Latzel M (2015) Long-Term Effects of Non-Linear Frequency Compression on Performance of Music and Speech Perception. Commun Disord Deaf Stud Hearing Aids 3:139. doi:10.4172/2375-4427.1000139