[Temporal resolution with a hearing aid in hearing impaired persons].
The purpose of hearing aid fitting is to improve the communication of the hearing impaired. Despite rigorous efforts to optimize hearing aid fitting there are still some patients who remain unsatisfied. The subject of research was to find improved methods of measuring, to increase the correlation between subjective information from the patient and objectively measurable data. With this goal in mind the variation of temporal resolution in hearing aid fitting was investigated in 88 patients comparing unaided and aided hearing basing on the method of determining the temporal resolution factor TRF at 500 Hz, 1500 Hz and 4000 Hz under free sound field conditions, as previously described by Schorn and Zwicker. The method is based on masking period patterns but measures only their maximum and minimum using continuous and 30-Hz square-wave amplitude modulated masking noise. The following three values of interest are measured: Threshold in quiet using interrupted continuous tones (500 ms on, 500 ms off) with the masker off; threshold masked by a continuous masker (octave-wide continuous noise) and threshold masked by a rectangulary modulated masker using 14 Hz, so that periods of 72 ms and pauses of 36 ms occur. TRF was defined as the ratio between the level differences derived from the three measured values. For normal hearing subjects this factor is about 1. The results show significant variation of the TRF comparing the data of the patients with and without hearing aids. The values for TRF unaided were 0.5 and 0.6 as well as under hearing aid.(ABSTRACT TRUNCATED AT 250 WORDS)
Brügel
F J
FJ
Klinik und Poliklinik für Hals-, Nasen- und Ohrenkranke, Ludwig-Maximilians-Universität München.
Schorn
K
K
D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D012048:Correction of Hearing Impairment; D004867:Equipment Design; D006310:Hearing Aids; D006801:Humans; D010470:Perceptual Masking; D010898:Pitch Perception; D011571:Psychoacoustics; D012016:Reference Values; D013998:Time Perception
Zeitauflösung mit Hörgerät beim Schwerhörigen.