2014
DOI: 10.1121/1.4885771
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Effect of bone-conduction harmonic distortions on hearing thresholds

Abstract: This study compares bone conduction (BC) thresholds obtained with two bone vibrators (BV): The Radioear B71 and an advanced BV, the Radioear B81. B81 has less distortion and is capable of higher output levels. Two tests with 20 normal hearing subjects were conducted to determine if the low distortion of B81 offers any advantages for audiometry. Hearing threshold differences between B71 and B81 are only significant at 250 Hz for levels between 20 dB hearing level (HL) and 30 dB HL. At other frequencies and high… Show more

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Cited by 22 publications
(22 citation statements)
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“…This risk is even greater if the BC thresholds is not obtained at frequencies below 500 Hz. A solution to this problem is to use a BC transducer that can be used at low frequencies, for example the Radioear B81 BC transducer ( 50 ), and measure BC thresholds down to 250 Hz but preferable down to 125 Hz. Also, recalibrating the audiometer for BC transducer use so it permits measurement down to−20 dB HL enable a more correct measure of the BC hyperacusis and a more reliable estimation of the ABG and SSCD diagnosis.…”
Section: Discussionmentioning
confidence: 99%
“…This risk is even greater if the BC thresholds is not obtained at frequencies below 500 Hz. A solution to this problem is to use a BC transducer that can be used at low frequencies, for example the Radioear B81 BC transducer ( 50 ), and measure BC thresholds down to 250 Hz but preferable down to 125 Hz. Also, recalibrating the audiometer for BC transducer use so it permits measurement down to−20 dB HL enable a more correct measure of the BC hyperacusis and a more reliable estimation of the ABG and SSCD diagnosis.…”
Section: Discussionmentioning
confidence: 99%
“…At low frequencies, harmonic distortion is a problem, while at high frequencies acoustic radiation could have influenced the results. Eichenauer et al [ 11 ] measured the output level of distortion products for several input levels of the fundamental frequency 250 Hz and reported that the second harmonic of the B71 becomes audible at an input level of 20 dB HL. However, for the B81 distortion is lower so that harmonics were found to be audible at a level of 30 dB HL of the fundamental frequency 250 Hz.…”
Section: Discussionmentioning
confidence: 99%
“…Performance characteristics of the B71 and the behavioural thresholds obtained have been thoroughly documented in literature (Billings and Winter 1977;Dirks et al 1979;Dirks and Kamm 1975;Eichenauer et al 2014;Frank, Byrne, and Richards 1988;Jansson et al 2015;Richards and Frank 1982). Physically, the B71 differed from its predecessor the B70 by its flat, circular contact tip, and from the B72 by its size and weight.…”
Section: Introductionmentioning
confidence: 97%
“…Details of the electroacoustic performance of the B81 compared to the B71 summarised here can be found in Jansson et al (2015). The B81 has been further evaluated in terms of harmonic distortion and tactile sensation, which are important for defining the upper limit of stimulus intensity for BC threshold measurements (Eichenauer et al 2014). At the fundamental frequency of 250 Hz, the B81 provides a larger dynamic test range than the B71 as the second harmonic does not become audible until the input to the B81 is 30 dB HL (20 dB HL for the B71) and tactile sensation, which occurs at 35 dB HL is not a confounding factor (Eichenauer et al 2014).…”
Section: Introductionmentioning
confidence: 99%
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