Auch als elektronisches Dokument verfügbar: https://www.researchgate.net/publication/277010710_Einfluss_von_Fingerfertigkeit_und_Nahsehscharfe_auf_die_Bedienung_von_HdO-_und_IdO-Horgeraten
Multidisziplinarität in der Audiologie 2015 2015, insges. 5 S. 308 S.
Acoustical Society of America The journal of the Acoustical Society of America Melville, NY : AIP Publ., 1929 138(2015), 5, Seite 3320-3331 Online-Ressource
For assessing hearing aid algorithms, a method is sought to shift the threshold of a speech-in-noise test to (mostly positive) signal-to-noise ratios (SNRs) that allow discrimination across algorithmic settings and are most relevant for hearing-impaired listeners in daily life. Hence, time-compressed speech with higher speech rates was evaluated to parametrically increase the difficulty of the test while preserving most of the relevant acoustical speech cues. A uniform and a non-uniform algorithm were used to compress the sentences of the German Oldenburg Sentence Test at different speech rates. In comparison, the non-uniform algorithm exhibited greater deviations from the targeted time compression, as well as greater changes of the phoneme duration, spectra, and modulation spectra. Speech intelligibility for fast Oldenburg sentences in background noise at different SNRs was determined with 48 normal-hearing listeners. The results confirmed decreasing intelligibility with increasing speech rate. Speech had to be compressed to more than 30% of its original length to reach 50% intelligibility at positive SNRs. Characteristics influencing the discrimination ability of the test for assessing effective SNR changes were investigated. Subjective and objective measures indicated a clear advantage of the uniform algorithm in comparison to the non-uniform algorithm for the application in speech-in-noise tests.
Acoustical Society of America The journal of the Acoustical Society of America Melville, NY : AIP Publ., 1929 135(2014), Seite 1541-1555 Online-Ressource
Acoustical Society of America The journal of the Acoustical Society of America Melville, NY : AIP Publ., 1929 136(2014), Seite 2642-2653 Online-Ressource
The influence of different properties of speech-like signals on loudness was investigated by measuring levels at equal loudness in normal-hearing listeners for 22 speech-like stimuli using categorical loudness scaling and an adaptive matching procedure. Eight of the stimuli, referred to as unprocessed stimuli, had the same speech-like long-term spectrum, but differed in other speech-related properties, ranging from a stationary noise over speech-modulated signals to real intelligible and unintelligible speech. The other stimuli were designed to investigate the influence of severe modifications of speech-related properties due to spectral filtering, reverberation, compression, and expansion on loudness. In general, results were similar for both measurement methods and revealed only small effects of temporal modulations on loudness perception, and no influence of intelligibility or reverberation. Even severe modifications of the stimuli by highpass-filtering and expansion did not affect levels at equal loudness. Only lowpass-filtering significantly decreased loudness and compression significantly increased loudness. The experimental results indicate that the long-term spectrum of speech has a major influence on loudness while other properties of speech only have a minor contribution. Some of the results could not be predicted by loudness models based on short-term loudness. Instead, longer time constants were required to not overestimate the loudness of time-varying speech-like sounds.
Acta acustica united with acustica Stuttgart : Hirzel, 2002 99(2013), 2, Seite 268-282 Online-Ressource