巻号一覧
39 巻, 3 号
選択された号の論文の10件中1～10を表示しています
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城戸 健一原稿種別: 本文
1983 年 39 巻 3 号 p. 145-146
発行日: 1983/03/01
公開日: 2017/06/02
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太田 光雄, 内野 英治原稿種別: 本文
1983 年 39 巻 3 号 p. 147-155
発行日: 1983/03/01
公開日: 2017/06/02
ジャーナル フリーIn this paper, a new trial of the time series prediction method by use of the adaptive functions for the environmental noise and vibration system is proposed. In general, though this kind of stochastic system can not be modeled by a simple equation, some kinds of correlations can be usually found between the observed past data of the fluctuation and their future values. The present prediction method is established based on not only the information of linear correlation but also that of higher order nonlinear correlations being latent among arbitrarily chosen samples of for the time series data. More concretely, the past and future fluctuation pattern of state variable is expressed in the universal function form of series expansion type with the linear combination of the newly introduced set of the adaptive functions. Consequently, the state prediction problem is converted into the problem of predicting each expansion coefficient in the above universal function form. Especially, by using systematically the orthogonal or nonorthogonal expansion type as the adaptive functions, this method enables the effective data-processing in the present prediction algorithm. Furthermore, the various or unified types of prediction algorithm with discrete and/or continuous time series types of adaptive functions can be found to suit the various fluctuation types of the observed data. Finally, the effectiveness of our methodology is confirmed experimentally by applying it not only to the simulation models of arbitrary system but also to the actually observed road traffic noise抄録全体を表示PDF形式でダウンロード (1095K) -
大賀 寿郎原稿種別: 本文
1983 年 39 巻 3 号 p. 156-164
発行日: 1983/03/01
公開日: 2017/06/02
ジャーナル フリーIn the search for a universal measure to compare electroacoustic transducer efficiencies, the relation between a working attenuation and practical specific response, and the dependence of both on frequency and transducer size, were studied. It was concluded that the working attenuation is useful, because it can be estimated easily from the specific response for a microphone. This working attenuation is almost independent from transducer size. Working attenuations for several microphones and receivers were compared, and utility of a piezoelectric ceramic transducers looked at.抄録全体を表示PDF形式でダウンロード (1012K) -
上野 孝文, 石井 伸一郎原稿種別: 本文
1983 年 39 巻 3 号 p. 165-172
発行日: 1983/03/01
公開日: 2017/06/02
ジャーナル フリーThis paper describes a new method of the analysis of the non-linear distortion of loudspeaker system including enclosure. The factors which contribute heavily to the distortion of the displacement of loudspeaker are the non-linear characteristics of the suspension system and the relationship between the driving signal and the magnetic force. The above problem is solved as follows:1)The loudspeaker system is represented by the impedance type analogous circuit. The input current is time-dependent sinusoidal signal and the consequent transient response is stored, from which the distortion is obtained by using FFT technique. 2)The effective flux density and the force are supposed to be cubic polynomials of the displacement. 3)To obtain the transient response, numerical integration algorithm is used, where the nodal equation for the equivalent circuit expressed by companion model(linear resistance model)is solved by iterative method. The distortion analysis of the bassreflex loudspeaker system is shown in detail. In this case the maximum number of iterations is50. The number of waves is from16at10Hz to72at200Hz. The time required for computation is about8minutes with VAX-11/780computer. The computed distortion level agrees with the measured distortion level very well.抄録全体を表示PDF形式でダウンロード (717K) -
太田 耕三, 淵 一博原稿種別: 本文
1983 年 39 巻 3 号 p. 173-184
発行日: 1983/03/01
公開日: 2017/06/02
ジャーナル フリーThis paper describes the property of antimetrical vocal tract area function and the vowel feature extraction. In the first half of the paper, the validity of the assumption of antimetricity of vocal tract characteristics on utterance of vowels is examined by the discrimination rate among the Japanese vowels uttered in isolation by 10 adult males. The discrimination rate of antimetrical vocal tract functions is higher than that of the almost antimetrical one and the one estimated by adaptive inverse filtering method. The phonetic features of vocal tract are more clearly described under the assumption of antimetricity. In the latter half of the paper, the linear model of the antimetrical vocal tract functions is constructed. In case of vowels uttered in isolation, the antimetrical vocal tract functions are approximated by2-dimensional linear model with normalized mean squared error of 2 percent. In case of vowels uttered continuously, the normalized mean squared error of the model is3. 4per cent. The phonetic features of both isolated and continuous vowels can be distinctively described by 2-dimensional linear model.抄録全体を表示PDF形式でダウンロード (1410K) -
我妻 幾久寿, 田中 美昭, 堀内 正人, 稲見 衛, 村岡 輝雄原稿種別: 本文
1983 年 39 巻 3 号 p. 185-190
発行日: 1983/03/01
公開日: 2017/06/02
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五十嵐 寿一原稿種別: 本文
1983 年 39 巻 3 号 p. 191-196
発行日: 1983/03/01
公開日: 2017/06/02
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三浦 甫原稿種別: 本文
1983 年 39 巻 3 号 p. 197-
発行日: 1983/03/01
公開日: 2017/06/02
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狩野 政男原稿種別: 本文
1983 年 39 巻 3 号 p. 198-203
発行日: 1983/03/01
公開日: 2017/06/02
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ハッチンス カーリーン M., 中村 勲, 永井 洋平原稿種別: 本文
1983 年 39 巻 3 号 p. 204-213
発行日: 1983/03/01
公開日: 2017/06/02
ジャーナル フリーPDF形式でダウンロード (1462K)
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