THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN
Online ISSN : 2432-2040
Print ISSN : 0369-4232
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Volume 20, Issue 6
Displaying 1-4 of 4 articles from this issue
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  • Analysis of Speech by Vocal Tract Configuration into Erequency Spectrum
    Yasuo Kadokawa, Kazuo Nakata
    Article type: Article
    1964 Volume 20 Issue 6 Pages 375-384
    Published: November 30, 1964
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.20.6_375
    JOURNAL FREE ACCESS
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    Articulatory reference theory should play a leading role in the future studies of analysis and recognition of speech. Articulatory representation of speech involves acoustical, anatomical and neurophysiological descriptions. This paper describes two methods of transformation of vocal tract configurations into frequency spectrum as the bases of practical speech analysis on the anatomical level. The first one is the calculation based upon the solution of sound wave propagation through vocal tract with proper boundary conditions this one becomes, however, too complex to solve practically in case of nasal sounds which have a side branch produced by nasal coupling. Another one is the calculation due to the equivalent network analysis of vocal tract configuration and this one gives the values of formant and anti-formant frequencies which are in good agreement with the results of analysis in case of nasal consonants. A few examples of calculation of formant/anti-formant frequencies from given vocal tract configurations in case of vowels, consonants and nasal consonants have confirmed that these two methods provide feasible processes of speech analysis in terms of vocal tract configurations.
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  • Synthesis of Vowels by a Digital Computer
    Shinichiro Hashimoto, Mitsuharu Matsumoto
    Article type: Article
    1964 Volume 20 Issue 6 Pages 385-395
    Published: November 30, 1964
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.20.6_385
    JOURNAL FREE ACCESS
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    Synthesis of vowels by a digital computer program is described in this paper. The program is developed for the purpose of 1)evaluation of the speech parameter extraction processes based upon autocorrelation method, 2)study on the auditory perception of effects of time variation of speech parameters, and 3)developement of artificial speech source for evaluation of transmission line. The program has nine speech parameters, such as first three formant frequencies and their bandwidths etc. , which can be controled in any from of time function pre-set by control information. Conversational speech sound composed of five Japanese vowels was synthesized by the program and the synthesized speech waves sound not only highly intelligible but also quite natural. These experimental results proved that this program was useful for the practical purposes mentioned above in respect to both memory capacity and speed for the computer M-IB
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1964 Volume 20 Issue 6 Pages 398-402
    Published: November 30, 1964
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.20.6_398
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1964 Volume 20 Issue 6 Pages 402-420
    Published: November 30, 1964
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.20.6_402
    JOURNAL FREE ACCESS
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