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  • Acoustical Society of America (ASA)  (5)
  • 1995-1999  (5)
  • 1
    Online Resource
    Online Resource
    Effects of a computer-based voice modification device for a speaker with recurrent nerve paralysis
    Acoustical Society of America (ASA) ; 1999
    In:  The Journal of the Acoustical Society of America Vol. 106, No. 4_Supplement ( 1999-10-01), p. 2247-2247
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 106, No. 4_Supplement ( 1999-10-01), p. 2247-2247
    Abstract: Patients with unilateral recurrent laryngeal nerve (RNL) paralysis may exhibit severe dysphonia depending on the resting position of the affected vocal fold. Major vocal symptoms of these patients are breathy voice, decreased vocal intensity, and physical fatigue due to great effort to approximate the vocal folds and to increase subglottal pressure. In some cases, phonosurgery is not applicable due to other medical problems, while a good prognosis is not expected by voice therapy. Technological assistance may be needed for such a patient. In this study, a real-time formant analysis-synthesis method was used to enhance speech intelligibility of a severely dysphonic patient with unilateral RNL paralysis. The voice source was modified by using inverse-filtered signals extracted from a normal speaker. A special hardware unit was designed to perform an analysis-synthesis process with temporal delay of 40 ms for signal processing. Vowels and sentences produced by the subject both with and without the device were analyzed. An approximately 20 dB increase of overall loudness level and increased harmonic components were observed for the processed speech. Perceptual judgment revealed improved speech intelligibility and less breathy voice quality for the processed speech. The subject reported less fatigue with the device as less effort was required for phonation.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.427664
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1999
    detail.hit.zdb_id: 1461063-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Diagnosis of the prosthetic cardiac valve by the characteristics of audible and ultrasonic closing click
    Acoustical Society of America (ASA) ; 1996
    In:  The Journal of the Acoustical Society of America Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2615-2615
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2615-2615
    Abstract: For the post-operative treatment of the prosthetic cardiac valve, its closure click was measured clinically. Ultrasonic range signal components, as well as the widely known audible signal components were found to exist. The frequency range of the ultrasonic click was from 8 kHz to more than 600 kHz, while that of the audible click was up to 8 kHz. Both of the clicks included effective diagnostic information. The Wigner distribution (WD) of the audible closing click offered the possible indices of thrombus and/or sclerosis. Especially, the first-order local moment of the WD showed capability for the quantitative diagnosis of the thrombosed valve. The ultrasonic closing click offered more diagnostic information for the bileaflet valve, while it also had sensitivity for the thrombosed valve. Since the waveform of the ultrasonic click indicated clearly the instance of the valve closing, it also revealed the exact time difference between the closing time of each leaflet, which could be used as the indices of bileaflet valve malfunction. With those characteristics of the closing click, detailed diagnosis of the prosthetic cardiac valve malfunction could be determined.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.417670
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1996
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Experimental investigation of dynamics of sonoluminescing bubbles
    Acoustical Society of America (ASA) ; 1999
    In:  The Journal of the Acoustical Society of America Vol. 105, No. 2_Supplement ( 1999-02-01), p. 1077-1077
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 105, No. 2_Supplement ( 1999-02-01), p. 1077-1077
    Abstract: Light scattering was carried out for a cavitation bubble trapped in a spherical flask. A He–Ne laser of 7 mW was used as the light source and the scattering angle was 90 deg. A function generator was used as the trigger source and a digital phospher oscilloscope for averaging the data. Changing the drive voltage resulted in differences in the signal waveform above and below the sonoluminescence threshold; a sonoluminescing bubble had the maximum radius greater than a dark bubble did, but showed smaller rebounds. This suggests that energy concentration is made possible by tight and symmetric collapse of the bubble. Sonoluminescence signals were also retrieved for a few hours with no laser light, and a discontinous drift was noted in the appearance time on the oscilloscope, suggesting that a bubble may have drifted in space discontinuously. [Work supported by Grant-in-Aid for Scientific Research, Ministry of Education, Science, and Culture, Japan.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.424515
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1999
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Characteristics of blood flow noise generated by cerebrovascular deformations
    Acoustical Society of America (ASA) ; 1996
    In:  The Journal of the Acoustical Society of America Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2616-2616
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2616-2616
    Abstract: A noninvasive detection system for cerebrovascular disease such as aneurysms, stenosis, and occlusions has been developed by using a specially designed PVDF-film sensor and signal analysis based on FFT and the Wigner distribution. About 90 patients with cerebrovascular diseases and 30 normal persons were measured at the Department of Neurosurgery, Ube Industries Central Hospital. FFT spectral differences between patients and normal persons exist over the frequency range from 0.5 to 1.2 kHz. In particular, the differences in spectral components between 750 Hz and 1.5 kHz could be the possible index for diagnosis of the existence of cerebrovascular disease. The FFT spectral pattern showed some differences between stenosis and aneurysms. In stenosis, it seemed that there existed a flat level from 0.4 to 2.2 kHz, while in aneurysms the power decreases smoothly from the peak around 0.7 kHz. Time variance of the blood flow noise according to the cardiac cycle could be seen in the stenosis from 30% to 50%, but not in the cases from 40% to 90%.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.417676
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1996
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Middle ear effect on otoacoustic emissions (OAEs): A finite-element method (FEM) analysis
    Acoustical Society of America (ASA) ; 1996
    In:  The Journal of the Acoustical Society of America Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2785-2786
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 100, No. 4_Supplement ( 1996-10-01), p. 2785-2786
    Abstract: Otoacoustic emissions (OAEs) are believed to originate from outer hair cell movement and are considered to be transmitted to the external auditory meatus through the middle ear in a retrograde fashion. Therefore, the effect of the middle ear on OAEs seems to be large. However, few investigations of middle ear effects on OAEs have been published. In this study, first, applying the authors’ own finite-element method (FEM) program, a three-dimensional FEM model of a human auditory periphery, which included the external auditory meatus, the tympanic membrane, ossicles, and middle ear cavities, was established. Then, the retrograde and anterograde transmission factors of the normal and pathologic middle ear were examined. The following conclusions can be drawn. (1) As expected, the value of the retrograde transmission factor is lower than that of the anterograde one. (2) This is mainly caused by the dynamic behavior of the tympanic membrane. (3) The levels of OAEs obtained from the patients such as atelectatic tympanic membrane, I–S joint separation, and otosclerosis are lower than the noise level of the OAE measurement system, because the value of the middle ear transmission factor of these patients is smaller than that of the normal subject.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.416464
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1996
    detail.hit.zdb_id: 1461063-2
    Location Call Number Limitation Availability
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    Online Resource
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