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  • Green, David M.  (4)
  • Comparative Studies. Non-European Languages/Literatures  (4)
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  • Comparative Studies. Non-European Languages/Literatures  (4)
RVK
  • 1
    Online Resource
    Online Resource
    Reliability of pure-tone thresholds at high frequencies
    Acoustical Society of America (ASA) ; 1995
    In:  The Journal of the Acoustical Society of America Vol. 98, No. 2 ( 1995-08-01), p. 828-836
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 98, No. 2 ( 1995-08-01), p. 828-836
    Abstract: Standing waves in the ear canal are created by the interference of two plane waves of the same frequency traveling in opposite directions. One manifestation of this phenomena is that any lateral motion of the transducer produces a change in the length of the canal and therefore, in general, a change in the sound level at the eardrum. Because of the smaller wavelength at the higher frequencies, the changes produced by movement of the transducer will be larger for the higher frequencies than for the lower frequencies. Thus, when the transducer is removed and replaced between successive threshold estimates, it is expected, from physical principles alone, that the intrasubject reliability of the estimates should be better at the lower frequencies. Previous studies, however, have shown that the intrasubject reliability of threshold estimates is nearly the same at both the low (0–8 kHz) and the high (8–16 kHz) frequency regions. A possible explanation for these anomalous results is proposed. While it is found that transducer placement increases the variability of threshold estimates more at the higher frequencies, it has also been found that conventional headphones reduce the size of the standing wave ratios compared with a hard wall termination. An additional factor is the steeper slope of the psychometric function at the higher frequencies. The combination of these factors produces a standard deviation for threshold estimates that is only about 1 dB larger at the high than at the low frequency region.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.413509
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1995
    detail.hit.zdb_id: 1461063-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Intrasubject reliability of pure-tone thresholds
    Acoustical Society of America (ASA) ; 1994
    In:  The Journal of the Acoustical Society of America Vol. 95, No. 5_Supplement ( 1994-05-01), p. 3005-3005
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 95, No. 5_Supplement ( 1994-05-01), p. 3005-3005
    Abstract: The effect of standing waves in the ear canal on the intrasubject reliability of pure-tone thresholds was investigated. Sound was transmitted to the ear canal through a hard-wall source and a 3-cm plastic tube. This created a standing wave field between the hard-wall source and the eardrum. In response to a broadband stimulus, the measured sound pressure at the entrance to the ear canal showed several maxima and minima for frequencies between 7000 and 14 000 Hz. Thresholds were measured at three frequencies where successive maxima and minima occurred and also at 1000 Hz. Four subjects were tested. The intrasubject reliability of the thresholds was tested across five sessions with the hard-wall source located at the same position or moved by as much as ±0.5 cm. Thresholds were not significantly different across the sessions when the hard-wall source had the same position. The movement of the hard-wall source across the five sessions resulted in significant changes in the high-frequency thresholds (±3 dB), but not in the low-frequency thresholds (±0.5 dB). [Research supported by NIH.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.408857
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1994
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Effects of standing waves on high-frequency thresholds
    Acoustical Society of America (ASA) ; 1992
    In:  The Journal of the Acoustical Society of America Vol. 92, No. 4_Supplement ( 1992-10-01), p. 2436-2436
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 92, No. 4_Supplement ( 1992-10-01), p. 2436-2436
    Abstract: The effects of standing waves in the ear canal on high-frequency pure-tone thresholds were investigated. Sound was transmitted from a transducer to a high-impedance source by a long plastic tube 0.64 cm in diameter. The high-impedance source was coupled to the ear canal by a shorter plastic tube 7 cm in length. Thus a standing wave field was created between the high-impedance source and the eardrum. Using a broadband stimulus, standing wave patterns were recorded by a small microphone placed near the high-impedance source. Several maxima and minima of the standing wave pattern were located in the frequency range from 6000–12 500 Hz. Thresholds were measured at two successive minima, the maximum between them and two intermediate values. Thresholds were also obtained with the high-impedance source removed from the system, resulting in a source impedance approximately equal to the characteristic impedance of air. Thresholds with and without the high-impedance source were compared and standing wave ratios (the difference between thresholds at the standing wave maximum and minimum) of 5–10 dB were observed. [Research supported by NIH.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.404600
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1992
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Characterization of external ear impulse responses using Golay codes
    Acoustical Society of America (ASA) ; 1992
    In:  The Journal of the Acoustical Society of America Vol. 92, No. 2 ( 1992-08-01), p. 1169-1171
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 92, No. 2 ( 1992-08-01), p. 1169-1171
    Abstract: This report explains the use of a complementary series, Golay codes, for probing the impulse response of the external ear. The codes are used to measure both the resonance of the human ear canal, using a sealed sound-delivery system, and to measure the transfer function of the pinna, using a free-field source. With two series of 512 binary numbers, the improvement in signal-to-noise ratio over a single impulse approaches the theoretical value of 30.1 dB [10 log(2⋅512)]. This technique has many of the same properties as maximal-length sequences [M. R. Schroeder, J. Acoust. Soc. Am. 66, 497–500 (1979)] , but it has the added advantage that the sequence length is an integer power of two and is, therefore, particularly convenient to use with modern Fourier transform techniques.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.404045
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1992
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
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