. The Bell System technical journal . sounds about second. Eachrecord shows a sequence of growth and decay in amplitude some-what as follows: first a period of rapid growth in amplitude lastingabout .04 second during which all components are quickly produced 232 ./ i>y.\. STUPy OF Tin: roifiiL solwds 2ii aiul rise to anipliliiili; >c(iiiiii a iiiiilillr prriiMl it)which thf gi-iuTal amphtuiU is iK-arly loiislant l)ul with varyingphase rtlations l)ttwevii tlu- ditTiTeiU components and lasting second, and linally a periml of gradual deca\- la
. The Bell System technical journal . sounds about second. Eachrecord shows a sequence of growth and decay in amplitude some-what as follows: first a period of rapid growth in amplitude lastingabout .04 second during which all components are quickly produced 232 ./ i>y.\. STUPy OF Tin: roifiiL solwds 2ii aiul rise to anipliliiili; >c(iiiiii a iiiiilillr prriiMl it)which thf gi-iuTal amphtuiU is iK-arly loiislant l)ul with varyingphase rtlations l)ttwevii tlu- ditTiTeiU components and lasting second, and linally a periml of gradual deca\- lasting second in which all the coni[)onents disappiar. A typical recordso obtained is shown in {ig. 2. A brief descriiuion of the inethud of inechanicalh anal>/,ing si:cha record is given in the appendix. The essential p)oint of the analysisis that the whole record from start to finish is taken as the unit foranalysis and the data obtained are therefore the a\ charac-teristics of the sounds throughout their It is usual to exhibit the properties of a vowel sound in a spectrumdiagram showing the amplitude of the component vibrations as afunction of their pitches or frequencies. For each vowel sound thereare, in addition to fundamental tones, certain characteristic regionsof resonance which may be at high or low frequencies. It wouldbe possible from the results of this analysis to present the soundspectra of each vowel showing the relative amplitudes for the dif-ferent frequencies as present in the original air vibration but thistreatment has been modified to take into account the relative im-portance of the various pitches in hearing. Using the data available In previous publications (Phys. Rev. XIX, 1922, p. 228, Fig. 7, and Belt SystemTechnical Journal, \o\. I, .\o. 1, p. 124,) data have been given showing the actualdistribution of energy in average sjx^ech. The tremendous concentration of energyin the lower frequencies is somewhat misleading unless
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