摘要:

The results of psychophysical tests on the auditory sensory system usually show much more variability than experiments involving only physical measurements of sound waves. This has resulted in the general impression that the variance of measurements of the auditory threshold and other psychoacoustic measurements is largely due to the inability of the observers to give consistent responses. This paper reports the results of a series of threshold measurements made under carefully controlled conditions and accompanied by search tube measurements of the sound pressures in the ear canals of the observers. The small variances obtained under certain conditions suggest that the large variability oftentimes experienced in psychophysical work is partly due to inadequate techniques for measuring the levels of the stimuli that activate the sensory system.

ISSN:0001-4966    

DOI:10.1121/1.1906616

出版商:Acoustical Society of America    

年代:1950

数据来源: AIP

摘要:

In 1939 a symposium was held by the Acoustical Society of America on the measurement of absorption coefficients. In these and other papers, the reverberation chamber method of determining absorption coefficient was analyzed, and explanations for discrepancies between different chambers, and lack of agreement with other methods, were presented in terms of newly developed theory. Since that time, however, practically no progress has been made in the application of this theoretical work. The discrepancies remain unresolved, and the practical problems resulting therefrom have become increasingly serious.Within recent months, interest in this subject has been strongly reactivated through the attention of three groups, namely, the American Standards Association, the American Society for Testing Materials, and the Acoustical Materials Association. By closely coordinated efforts, these groups are making a new attempt to develop methods of measuring and rating the absorptive properties of acoustical materials which will yield consistent results in the form most useful for practical engineering work and at the same time are grounded in well‐established acoustical theory.In the present paper, the general problem is outlined from the viewpoint of the acoustical materials manufacturer. Directions of further development in theory and of experimental attacks are suggested.

ISSN:0001-4966    

DOI:10.1121/1.1906617

出版商:Acoustical Society of America    

年代:1950

数据来源: AIP