THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN
Online ISSN : 2432-2040
Print ISSN : 0369-4232
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Volume 41, Issue 6
Displaying 1-12 of 12 articles from this issue
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  • [title in Japanese]
    Tanetoshi Miura
    Article type: Article
    1985 Volume 41 Issue 6 Pages 365-
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_365
    JOURNAL FREE ACCESS
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  • Meomoirs
    Kaname Kurihara
    Article type: Article
    1985 Volume 41 Issue 6 Pages 366-367
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_366
    JOURNAL FREE ACCESS
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  • The relationship between the cross-correlation function of two-channel acoustic signals reproduced through the headphones and spatial impressions of sound image
    Kohichi Kurozumi, Kengo Ohgushi
    Article type: Article
    1985 Volume 41 Issue 6 Pages 368-377
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_368
    JOURNAL FREE ACCESS
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    The relationship between the cross-correlation function of two-channel acoustic signals reproduced through the headphones and spatial impressions of sound image is investigated. White or band-limited noises with the various cross-correlation function are employed for acoustic signals. Subjects are asked to make similarity judgments and some subjective evaluations of pairs of the noises. The experimental data are analyzed by Kruskal's multidimensional scaling(MDS)programs. The analysis of the experimental data shows the followings:(1)spatial impressions of sound image depend mostly on the width, the elevation and the lateral displacement of the sound image, (2)the width of the sound image increases as the maximum absolute value of the cross-correlation function decreases and the peak position of it goes away from τ=0, (3)the elevation of the sound image tends to increase as the maximum value of the cross-correlation function increases as long as the maximum value is positive, (4)the lateral displacement depends on the asymmetry of the shape of the cross-correlation function and mostly on the positive peak position of it
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  • Studies for the realization of parametric loud-speaker
    Tomoo Kamakura, Masahide Yoneyama, Kazuo Ikegaya
    Article type: Article
    1985 Volume 41 Issue 6 Pages 378-385
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_378
    JOURNAL FREE ACCESS
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    Parametric loudspeaker uses the self-demodulation effect of a finite amplitude ultrasound being amplitude modulated by audio signal, and the consequent special feature of this loudspeaker is very sharp directivity. In the present paper, a new amplitude modulation for primary wave is proposed to reduce the harmonic distortions of demodulated audio sound. The input signal has the form of square rot of envelope function. If ultrasonic transducers that construct parametric loudspeaker have wide and uniform frequency response, the demodulated audio sound does not contain any harmonic distortions as far as quasilinear approach for nonlinear acoustic process is valid. Experimental verifications were done for reduction of harmonic distortion using this modified double-sideband(MDSB)excitation, and it has been made clear that MDSB excitation suppresses 2nd harmonic generateon by about 10dB less than the commonly used DSB excitation. In order to attenuati the large amplitude ultrasound which is dangerous to auditory sense of human being even in farfield region of parametric array, the authors discuss the acoustic filtering of primary and secondary waves
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  • Acoustical studies of Japanese traditional drums'Tsuzumi' : Analysis,synthesis and subjective evaluation
    Shigeo Ando, Kiminori Yamaguthi
    Article type: Article
    1985 Volume 41 Issue 6 Pages 386-394
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_386
    JOURNAL FREE ACCESS
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    After the characteristics of vibrations on the membranes of tsuzumi (Japanese traditional drums)have been reviewd, ootsuzumi and kotsuzumi tones are analyzed and their several physical parameters are extracted by means of discrete Fourier transform(DFT)techiques, and the synthesized tones using these parameters are produced and studies with regard to the features of these physical parameters contributing to the tone quality of tsuzumi. Physical parameters of tsuzumi tones are classified in the following, (1)waveforms, (2)spectrum, (3)amplitude envelopes of partials, and(4)time-variances of the frequencies of partials, and they are analyzed for several playing styles. Three synthesis methods if the following are applied to the simulation of tsuzumi tones, (a)partial synthesis, (b)additive synthesis, and(c)additive synthesis which includes partial synthesis on parts of spectrum, As a result, it is verified that the synthesized tones have good similarity to the original ones using the method(a)above for ootsuzumi tones, (b)for otsuzumi ones of Otsu and Hodo styles, and(c)for kotsuzumi ones on Kashira and Kan styles. These results may be applied to the synthesis of electronic musical instrument tones
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  • Guest editor's note on the special issue"Automatic musical performance"
    Isao Nakamura
    Article type: Article
    1985 Volume 41 Issue 6 Pages 395-
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_395
    JOURNAL FREE ACCESS
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  • Some notes on automatic musical instruments except keyboard instruments
    Makoto Kajitani
    Article type: Article
    1985 Volume 41 Issue 6 Pages 396-401
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_396
    JOURNAL FREE ACCESS
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  • Automatic playing of pianos and electric musical instruments
    Yoshimitsu Takasawa, Kazunori Miyoshi
    Article type: Article
    1985 Volume 41 Issue 6 Pages 402-406
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_402
    JOURNAL FREE ACCESS
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  • Computer program for automatic musical performance
    Isao Nakamura
    Article type: Article
    1985 Volume 41 Issue 6 Pages 407-411
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_407
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  • Automatic recognition of printed music
    Sadamu Ohteru, Toshiaki Matsushima, Katsuhiro Kanamori
    Article type: Article
    1985 Volume 41 Issue 6 Pages 412-415
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_412
    JOURNAL FREE ACCESS
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  • MIDI and MPU-401
    Roland Corporation
    Article type: Article
    1985 Volume 41 Issue 6 Pages 416-418
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_416
    JOURNAL FREE ACCESS
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  • COSMO synthesizer system
    Ltd CASIO Computer Co.
    Article type: Article
    1985 Volume 41 Issue 6 Pages 419-420
    Published: June 01, 1985
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.41.6_419
    JOURNAL FREE ACCESS
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