Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology · 2025
The Effect of a Notch Filter in Sound Preprocessing of Active Middle Ear Implants on Speech Perception.
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Zelger Philipp, Koci Viktor, Weichbold Viktor, Muigg Franz, Raffelsberger Tobias, Keintzel Thomas, Schmutzhard Joachim, Seebacher Josef
Аннотация
OBJECTIVE: The effect of two different notch filters in sound pre-processing of active middle ear implant (AMEI) on speech perception was studied.
METHOD: Speech perception was tested in 20 adults with AMEI using the Oldenburg sentence test (OLSA) in quiet at a fixed presentation level of 65 dB HL. Three conditions were tested: notch filter option not active, acoustic notch filter activated at a center frequency of 4 kHz and acoustic notch filter activated at a center frequency of 6 kHz.
RESULTS: Hearing thresholds were significantly affected by the notch filters at the particular center frequencies. The drop in hearing thresholds at 4 and 6 kHz was about 15 dB HL (median value). Pair comparisons between condition "notch filter option not activated" and "notch filter activated" reached significance for both center frequencies, i.e. p < 0.01. In contrast, no significant differences were seen between the word recognition scores of the OLSA speech test obtained for each of the three conditions.
CONCLUSION: Speech perception in quiet was not affected while a notch filter at 4 or 6 kHz was activated in sound pre-processing in patients with an AMEI. However, according to subjective feedback from the patients, the listening effort was increased as soon as one of the notch filters was activated.
METHOD: Speech perception was tested in 20 adults with AMEI using the Oldenburg sentence test (OLSA) in quiet at a fixed presentation level of 65 dB HL. Three conditions were tested: notch filter option not active, acoustic notch filter activated at a center frequency of 4 kHz and acoustic notch filter activated at a center frequency of 6 kHz.
RESULTS: Hearing thresholds were significantly affected by the notch filters at the particular center frequencies. The drop in hearing thresholds at 4 and 6 kHz was about 15 dB HL (median value). Pair comparisons between condition "notch filter option not activated" and "notch filter activated" reached significance for both center frequencies, i.e. p < 0.01. In contrast, no significant differences were seen between the word recognition scores of the OLSA speech test obtained for each of the three conditions.
CONCLUSION: Speech perception in quiet was not affected while a notch filter at 4 or 6 kHz was activated in sound pre-processing in patients with an AMEI. However, according to subjective feedback from the patients, the listening effort was increased as soon as one of the notch filters was activated.