THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN

On Experimental Results of Correlation between Physical and Psychological Quantities in Room Acoustics : 1.On Experimental Results in Artificial Sound Field obtained in Anechoic Room

Takesaburo Yanagisawa, Tadamoto Nimura

Article type: Article
1968 Volume 24 Issue 3 Pages 111-125
Published: May 30, 1968
Released on J-STAGE: June 02, 2017

DOIhttps://doi.org/10.20697/jasj.24.3_111

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We discussed the correlation between physical and psychological quantities based on the data taken from the artificial sound field obtained in anechoic room. From the consideration of linear correlation coefficients, we can state the following: (1) Time vs. sound pressure ratio and the decay-time of the short tone pulse correlated better than others to aesthetic and lyric factors, and to voluminous and space factors. (2) Also, the time vs. sound pressure ratio correlated to the softness factor. (3) In comparison to the decay-time of the short tone pulse, the time vs. sound pressure ratio showed a better correlation to these psychological measures. (4) Tone pulse which was constant for the duration of 25 msec was available for the sound source of this type of physical measurement. (5) The assumption that there exists linear correlation between physical and psychological quantities was approved.

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Radiation Field from a Distribution of Acoustic Sources

Hiroshi Hataoka

Article type: Article
1968 Volume 24 Issue 3 Pages 126-133
Published: May 30, 1968
Released on J-STAGE: June 02, 2017

DOIhttps://doi.org/10.20697/jasj.24.3_126

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In this paper, the acoustic sources considered are velocity sources and pressure sources. The acoustic fundamental equations in the presence of a distribution of these sources are div u= -(1/κ)ap/at +q and grad p= -pau/at+a, where p is the pressure, u is the velocity vector of particle, t is the time, p is the density of medium, and 1; is the coeffcient of elasticity. The function q(1/sec), which has been called the density of sources, is especially called the density of velocity sources in this paper. The new function a(N/m^3) is called the density of pressure sources. The radiation field by a is identical with the field caused by the density of doublet Sources b which is equal to (1/j")p)a for the harmonic motion with angular frequency ", . The presence of a layer of velocity sources on surface results in the discontinuity of the normal component of u, and the presence of a layer of pressure sources on surface results in the discontinuity of pressure. By these boundary conditions and equivalence principle, the field exterior to a closed surface is obtained, and this field is identical with the field computed from Kirchhoff's formula. The solutions by the method of auxiliary sources are also identical with the solutions mentioned above.

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Statistical Studies on the Level Fluctuation of Random Noise(IV) : A Practical Method for the Detection of Information on Correlation of the First Order

Mitsuo Ohta

Article type: Article
1968 Volume 24 Issue 3 Pages 134-142
Published: May 30, 1968
Released on J-STAGE: June 02, 2017

DOIhttps://doi.org/10.20697/jasj.24.3_134

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First, two general expressions of the conditional probability density function in the form of expansion series are calculated by referring to the definition of conditional probability from two expansion expressions of the bivariate joint probablity density function derived previously in the form of orthonormal expansion series such as the statistical Hermite expansion or the statistical Laguerre expansion. However, for the purpose of getting information on correlation of the first order, we had better find the expression of conditional average instead of using the above conditional probability density functions. Thus, two explicit expressions of the correlation function of the first order are prmented in the form of expansion series from the equations of conditional average. We must give attention to the fact that a universal form comes first in these expansions and factors determining the form of the marginal one-variate probability density function and the correlation functions of high orders are reflected in the compensation terms. Further, a simple expression of the correlation of the first order related to the conditional average can be approximately derived in a single form as a practical method for the detection of information on correlation of the first order and is also experimentally verified.

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Electro-mechanical Filter Consisting of a Disc Vibrator with Double Resonance in Radial and Bending Modes and Differential Type Filter Consisting of two Disc Vibrators with Single Resonance

Masashi Konno, Yoshiro Tomikawa, Takehiro Takano

Article type: Article
1968 Volume 24 Issue 3 Pages 143-150
Published: May 30, 1968
Released on J-STAGE: June 02, 2017

DOIhttps://doi.org/10.20697/jasj.24.3_143

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This paper deals with some designs and experimental results of the electro-mechanical filter consisting of a disc vibrator with double resonance, for example, of the primary resonance in radial mode and the secondary resonance in bending mode. The construction and the experimental results of the differential type filter consisting of two disc vibrators with a single resonance mode are also described.

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A model of the Peripheral Auditory System

Kengo Ohgushi, Hisao Sakai

Article type: Article
1968 Volume 24 Issue 3 Pages 151-160
Published: May 30, 1968
Released on J-STAGE: June 02, 2017

DOIhttps://doi.org/10.20697/jasj.24.3_151

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Recent electrophysiological data obtained from auditory nerve fibers of cats and monkeys have made it possible to construct a model of the peripheral auditory system. A model has been constructed for the purpose of inferrins the neural connections between hair cells and primary neurons. This model is composed of a basilar membrane, hair cells and primary neurons. The neuron characteristics (response area and inhibitory area) of this model are changed remarkably by varying the mode of neural connections between hair cells and primary neurons. In this paper, the conditions which the mode of neural connection must satisfy to fit the physiolngical data are: discussed and the masking effect which is a psycho- physical effect in auditory system is also discussed in connection with the problem of the elevation of threshold of the primary neurons in the presence of masking tone.

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[title in Japanese]

Article type: Appendix
1968 Volume 24 Issue 3 Pages 166-
Published: May 30, 1968
Released on J-STAGE: June 03, 2017

DOIhttps://doi.org/10.20697/jasj.24.3_166

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[title in Japanese]

Article type: Appendix
1968 Volume 24 Issue 3 Pages 169-177
Published: May 30, 1968
Released on J-STAGE: June 03, 2017

DOIhttps://doi.org/10.20697/jasj.24.3_169

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