THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN
Online ISSN : 2432-2040
Print ISSN : 0369-4232
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Volume 31, Issue 6
Displaying 1-8 of 8 articles from this issue
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  • Acoustical Features of the Four Tones in Monosyllabic Utterances of Standard Chinese
    Chiu Kuang Chuang, Shizuo Hiki, Toshio Sone, Tadamoto Nimura
    Article type: Article
    1975 Volume 31 Issue 6 Pages 369-380
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_369
    JOURNAL FREE ACCESS
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    Monosyllabic words of various phonemic constitutions were spoken with the Four Tones of the standard Chinese by two male and a female speakers born in Formosa, and typical fundamental frequency patterns of the Four Tones for each speaker were extracted from those speech samples, and their average fundamental frequency, range of changes in fundamental frequency and duration were also analyzed. Listening tests were then conducted to identify the kind of tone of the speech samples, and perceptual cues of the Four Tones were investigated through the confusion among tones, which was characteristic of each group of native and non-native listeners. Based on the results of the acoustical analysis and the listening test the essential features of the Four Tones were derived. Effect of the amplitude envelope on the tone accent was also discussed.
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  • Study of New Crosslinking Method of Crosslinked Polyethylene Cable with Ultrasonic Wave
    Setsuya Issiki, Tetsuo Shiromizu, Eiji Mori
    Article type: Article
    1975 Volume 31 Issue 6 Pages 381-389
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_381
    JOURNAL FREE ACCESS
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    Crosslinked polyethylene cables are increasingly used for cables of 66 kV or higher. As these extra-high voltage cables need thicker insulation, continued advances in insulation and manufacturing technology are required. We conducted a series of studies on these problems and devised an ultrasonic wave method to effectuate crosslinking. Our equipment can radiate powerful 400 kHz ultrasonic waves of several kW or higher which can heat the innermost insulator layer of polyethylene and crosslink in a short period of time.
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  • Measuring Method of Target Strength of Sands Suspended in Water
    Shigeo Ohtsuki
    Article type: Article
    1975 Volume 31 Issue 6 Pages 390-396
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_390
    JOURNAL FREE ACCESS
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    Doppler effect of ultrasonic wave offers a system of measuring the speed of sands suspended in water. The design of this system demands the estimation of ultrasonic target strength of sands suspended in water. Furthermore, it seems that scattering of ultrasonic wave from the reveals their volume concentration and distribution in size. Then, this paper deals with a measuring method of the ultrasonic target strength of sands suspended in water. The amplitude of received signal is changing widely as the sample is rotated. This change seems to be caused by interference of the scattered waves from the particles. Statistical analysis on this interference leads to a result that the rms value of 36 measured sound pressure values gives the effective scattered sound pressure with about 10% in deviation. When the sample is placed in the neighborhood of transmitter and receiver, the received signal decreases, Compensation of this reduction is also described.
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  • Investigation on Edge Phenomenon of a Finite Absorbing Panel
    Kiyoshi Awaya, Hiroaki Ikeda
    Article type: Article
    1975 Volume 31 Issue 6 Pages 397-406
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_397
    JOURNAL FREE ACCESS
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    In order to make it easy to estimate the edge phenomenon for an incident sound-wave with arbitrary waveform by the convolution integral, at first the authors give the analytical solutions of the edge wave by using the Kirchhoff's equation for step incident wave. Secondly, a correlationless continuation of sine-wave of finite length is adopted as practical waveform, and after successive analyses for this incident wave, the following results are obtained: (1) The graphic representation of excess absorbing power is made for various incident angles. (2) Utilizing this representation, the amount of edge effect for arbitrary combinations of sound absorbing panels is estimated.
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  • Principles and Current Status of Modern Electrocochleography
    Nobuo Yoshie
    Article type: Article
    1975 Volume 31 Issue 6 Pages 407-413
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_407
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  • Electro-Acoustic Transducers with Piezoelectric High Polymer Films
    Masahiko Tamura, Kiyonori Iwama, Toshikazu Yoshimi
    Article type: Article
    1975 Volume 31 Issue 6 Pages 414-417
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_414
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  • Research on Sound Localization at Institut fur Electrische Nachrichtentechnik PWTH,Aachen
    Masayuki Morimoto
    Article type: Article
    1975 Volume 31 Issue 6 Pages 418-421
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_418
    JOURNAL FREE ACCESS
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  • Audio Transistor
    Jun-ichi Nishizawa
    Article type: Article
    1975 Volume 31 Issue 6 Pages 422-427
    Published: June 01, 1975
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.31.6_422
    JOURNAL FREE ACCESS
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