ISSN:0001-4966    

DOI:10.1121/1.1916032

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

摘要:

For a number of years hearing impairment has been expressed by the audiogram, which is a measure of the hearing loss for sounds which are just audible to the deafened ear, with the implication that impairment for threshold sounds indicates the impairment for sounds above threshold in the range of interest to the deafened. It is shown that the audiogram is not an accurate indication of hearing impairment for above threshold sounds in cases involving nerve deafness, when the loss in loudness sensation is taken as the criterion; but when the capacity to interpret speech sounds, as indicated by articulation tests, is the criterion, the audiogram does give an approximately correct indication of the hearing impairment. The relation of the audiogram to experiences in interpreting the speech of everyday life and the relation of hearing loss to absolute ear sensitivity are given.

ISSN:0001-4966    

DOI:10.1121/1.1916033

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

摘要:

Using apparatus designed to collect a large number of data in a short time, the following measurements have been made: peak and r.m.s. pressures in one‐eighth‐second intervals, and in various bands of frequencies up to 12,000 cycles per second, from the voices of six men and five women; comparison of r.m.s. pressures in one‐eighth‐ and one‐fourth‐second intervals, from a single male voice; and distribution of the instantaneous pressures in whole speech, from a single voice. Derived from these data are peak factors in one‐eighth‐second intervals, and frequency distribution of speech energy in long intervals. Both the absolute value and the distribution of energy are found somewhat different from previously published results.

ISSN:0001-4966    

DOI:10.1121/1.1916034

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

摘要:

Curves have been calculated for the total radiation resistance and reactance of a single circular piston as a function of frequency when another circular piston is vibrating in the same infinite plane, the distance of separation of the two pistons being a parameter. The curves shown are for equal velocity amplitudes and for phase differences of 0° and 180°. These results enable one to calculate the impedance of a piston when there are present an arbitrary number of pistons in arbitrary phases.

ISSN:0001-4966    

DOI:10.1121/1.1916035

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916036

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916037

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916038

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916039

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916040

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP

ISSN:0001-4966    

DOI:10.1121/1.1916041

出版商:Acoustical Society of America    

年代:1940

数据来源: AIP