Bressmann Tim, Tang Blanche Hei Yung
Department of Speech-Language Pathology, University of Toronto, Toronto, Ontario, Canada.
Department of Speech and Hearing Sciences, Hong Kong University, Hong Kong, Hong Kong.
Clin Linguist Phon. 2025 Apr-May;39(4-5):504-514. doi: 10.1080/02699206.2024.2305118. Epub 2024 Feb 12.
The goal of the present research study was to investigate possible differences in nasalance scores between different Nasometer headgears. Frequency response characteristics of microphone pairs in a Nasometer model 6200, a model 6450 and two model 6500 headsets were compared using long-term average spectra of white noise and multi-speaker babble signals. Prerecorded sound files from a male and a female speaker were used to record nasalance scores with the four Nasometer headsets and to calculate cumulative absolute differences within and between the headsets. The main outcome measures were the cumulative absolute differences between the decibel (dB) values in the frequency bins from 300 to 750 Hz for the nasal and oral channels of each microphone pair. Cumulative absolute differences between nasalance scores of repeated stimuli within and across Nasometer headsets were tabulated. Results showed that cumulative absolute differences for the frequency range 300-750 Hz were between 6.58 and 7.68 dB. Within headsets, 95.6% to 100% of measurements of all four Nasometer headsets were within 3 nasalance points, although test-retest differences of up to 6 nasalance points were found. Between headsets, 56.1% to 98.9% of measurements were within 3 nasalance points, with the single largest difference of 8 nasalance points. In conclusion, differences between repeated nasalance scores obtained with the same and different headsets were noted. Clinicians should allow a margin of error of ±6 to 8 nasalance points when interpreting scores from different Nasometer headsets.
本研究的目的是调查不同鼻声计头带在鼻声率得分上可能存在的差异。使用白噪声和多说话者嘈杂信号的长期平均频谱，比较了鼻声计6200型、6450型以及两款6500型耳机中麦克风对的频率响应特性。使用来自一名男性和一名女性说话者的预录制声音文件，通过四种鼻声计耳机记录鼻声率得分，并计算耳机内部和之间的累积绝对差异。主要观察指标是每个麦克风对的鼻腔和口腔通道在300至750赫兹频率区间内分贝（dB）值之间的累积绝对差异。列出了鼻声计耳机内部和之间重复刺激的鼻声率得分的累积绝对差异。结果显示，300 - 750赫兹频率范围的累积绝对差异在6.58至7.68分贝之间。在耳机内部，所有四款鼻声计耳机95.6%至100%的测量值在3个鼻声率点以内，不过发现重测差异高达6个鼻声率点。在耳机之间，56.1%至98.9%的测量值在3个鼻声率点以内，最大差异为8个鼻声率点。总之，注意到使用相同和不同耳机获得的重复鼻声率得分之间存在差异。临床医生在解释来自不同鼻声计耳机的得分时，应允许±6至8个鼻声率点的误差范围。
