Bozorg-Grayeli and colleagues from five different university hospitals in France1 showed that Oticon Medical cochlear implant users (20 adults) benefited from a sound processor upgrade introducing CrystalisXDP.
Improvements were observed in speech perception scores in quiet at different intensities, in speech perception in noise, and in a global improvement in sound quality. In particular, when compared to the former signal processing strategy, speech perception in noise had improved by 30–40% after a 30-day habituation period.
Speech recognition was first assessed in quiet at 40, 55, 70 and 85 dB SPL. CrystalisXDP was set to its medium preset, optimised for sounds with an average intensity of 70 dB SPL. As seen in Figure 1, all scores were higher with CrystalisXDP, either on the day of renewal or after the habituation period had ended. Scores gradually increased for speech sounds presented at 55 dB SPL, reaching a significant +8.5% compared to the standard strategy after the habituation period. Improvements were also observed for higher intensities, with +7.8% at 70 dB SPL (significant at Day 0), and a +17.7% at 85 dB SPL at Day 30, suggesting a better representation of loud sounds.
Figure 1: Vocal audiometry in quiet at 40, 55, 70 and 85 dB (n = 20)