. BSTJ 1: 1. July 1922: The Nature of Speech and Its Interpretation. (Fletcher, Harvey) . encies throughout thespeech range. In order that its uniformity may be appreciated, a comparisoncurve is given. This curve shows the deviation in the .sensitivityof a typical individual ear from the average sensitivity of a largenumber of ears. The ordinates represent the ratio of amplitudesat the various pitches which was necessary to bring the tone to thethreshold of audibility. It is evident that this deviation is muchlarger than the departure of the high quality circuit from uniformity. To show that t
. BSTJ 1: 1. July 1922: The Nature of Speech and Its Interpretation. (Fletcher, Harvey) . encies throughout thespeech range. In order that its uniformity may be appreciated, a comparisoncurve is given. This curve shows the deviation in the .sensitivityof a typical individual ear from the average sensitivity of a largenumber of ears. The ordinates represent the ratio of amplitudesat the various pitches which was necessary to bring the tone to thethreshold of audibility. It is evident that this deviation is muchlarger than the departure of the high quality circuit from uniformity. To show that this particular individuals curve is typical, thecurves for both ears of 20 women are given in Fig 3. For conveniencethese curves are plotted on logarithmic paper. If an arithmetic NATURE OF SPEECH AND ITS INTERPRETATION 137 scale is used, all of the curves below the mean arc crowded togetherin the small space between zero and one, and all those above themean are stretched out from one to infinity. By using a logarithmicplot a symmetrical distribution is obtained. The method of obtain-. ing these ear sensitivity curves was fully described in a recent paper2given before the Natural Academy of Sciences. ■ * It is interesting to note that they indicate that each individualhas a hearing characteristic which is quite different from other in-dividuals. Consequently speech sounds differently to differentpersons. Any distortions of the speech sounds will necessarilyaffect some persons differently from others. It is evident then thatin discussing speech and hearing we must deal with statistical articulation tests showed that the ear interpretedthe speech which was transmitted over this high quality systempractically as well as that transmitted through the air. Some maywonder why such good quality is not furnished telephone users incommercial practice: Scientifically speaking, it is possible to furnishsuch quality, but it is evident that the equipment involved is s
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