摘要:

Traditionally, the formant frequencies are regarded as the most important characteristics of the frequency spectra of vowels. It is possible, however, to approach the differences between vowel spectra in a more general way by means of a dimensional analysis. For a particular vowel, the sound‐pressure levels in each of a number of frequency passbands can be considered as coordinates of a point in a multidimensional Euclidean space. Different vowel spectra will result in different points. Frequency spectra of 15 Dutch vowels were determined with 18 bandpass filters (10 speakers). The analysis indicated that the “cloud” of 150 points can be described by four independent dimensions that are linear combinations of the original 18. The percentage of total variance “explained” by these dimensions were 37.2%, 31.2%, 9.0%, and 6.7%, respectively. This approach presents interesting perspectives for the development of vowel‐discrimination equipment.

ISSN:0001-4966    

DOI:10.1121/1.1910398

出版商:Acoustical Society of America    

年代:1967

数据来源: AIP

摘要:

Published material on the calibration of circumaural earphones is briefly reviewed. The present lack of knowledge about these earphones and about the earphone‐to‐ear coupling is indicated, and the resultant limitations on the routine use of circumaural earphones in clinical and industrial pure‐tone audiometry are presented.

ISSN:0001-4966    

DOI:10.1121/1.1910399

出版商:Acoustical Society of America    

年代:1967

数据来源: AIP

摘要:

Response to an article by W. D. Ward entitled “Use of Sensation Level in Measurements of Loudness and of Temporary Threshold Shift” [J. Acoust. Soc. Am.39, 736–740 (1966)] in which Ward disagrees with our conclusion that intersubject threshold differences are not accompanied by loudness recruitment. We attempt to show that Ward's demonstration of interfrequency recruitment in individual ears is irrelevant to our conclusion. We also take issue with the style of writing used by Ward.

ISSN:0001-4966    

DOI:10.1121/1.1910400

出版商:Acoustical Society of America    

年代:1967

数据来源: AIP

摘要:

Rebuttal is given to the arguments of Zwislocki and Hellman. Comments attempt to clarify the discussion involved in the use of sensation‐level measurements.

ISSN:0001-4966    

DOI:10.1121/1.1910401

出版商:Acoustical Society of America    

年代:1967

数据来源: AIP

摘要:

The pressure spectrum of the sonic‐boomNwave is simply given byP (ω) = (2π)−12TP(T)j1(ωT/2), whereTis the boom duration,P(T) is the pressure amplitude, andj1(ωT/2) is a spherical Bessel function of the first kind and order. The effective acoustic period of theNwave is approximately32times its duration. The present formulation is a simplification of those by Crocker and Young. The spectrum formula given by Zepler and Harel is incomplete.

ISSN:0001-4966    

DOI:10.1121/1.1910402

出版商:Acoustical Society of America    

年代:1967

数据来源: AIP

摘要:

It has been shown that the phenomenon of persistence of diffracted lines in water suspensions of starch at different temperatures and also in water solutions of sucrose at different concentrations and constant temperature is related to the viscosity coefficient of the medium in terms of diffusion theory. Therefore, we propose a method for the determination of viscosity coefficients by means of ultrasonics.

ISSN:0001-4966    

DOI:10.1121/1.1910403

出版商:Acoustical Society of America    

年代:1967

数据来源: AIP