. Elements of acoustical engineering. Electro-acoustics; Sound. 326 SPEECH, MUSIC AND HEARING either very small pickup distances or directional collecting systems in the monaural collection of sound. The Frequency and Volume Ranges of Speech and Music and the Effects of Frequency Distortion upon Reproduced Sound. — The fre- quency range of the average normal ear is from 20 to 20,000 cycles. The frequency range of most reproducing channels such as the radio, the tele- phone, the phonograph and the sound motion picture is considerably less than that of the hearing range of the ear. It is
. Elements of acoustical engineering. Electro-acoustics; Sound. 326 SPEECH, MUSIC AND HEARING either very small pickup distances or directional collecting systems in the monaural collection of sound. The Frequency and Volume Ranges of Speech and Music and the Effects of Frequency Distortion upon Reproduced Sound. — The fre- quency range of the average normal ear is from 20 to 20,000 cycles. The frequency range of most reproducing channels such as the radio, the tele- phone, the phonograph and the sound motion picture is considerably less than that of the hearing range of the ear. It is interesting to note the effect of the frequency range upon the intelligibility of speech and the quality of music. The frequency " and volume ranges of speech and orchestral music are shown in Fig. The reproduction of speech with perfect fidelity. 2000 100 TREIQUENCY 1000 IN CYCLES PER .002 .0002 ^ 00002 Fig. Frequency and volume ranges of speech and music. (From Bell Laboratories Record, June, 1934.) requires a frequency range of from 100 to 8000 cycles and a volume range of 40 db. The reproduction of orchestral music with perfect fidelity requires a frequency range of from 40 to 14,000 cycles and a volume range of 70 db. The effect ^^ of reducing the high and low frequency range upon speech articulation is shown in Fig. It will be seen that a relatively high articulation can be obtained with a very narrow transmission band. How- ever, the quality of the reproduced speech is very much impaired by transmission over a narrow frequency band. A limited range may be " Bell Laboratories Record, Vol. 12, No. 6, p. 314, 1934. ^^ Fletcher, " Speech and Hearing," p. 280, D. Van Nostrand Co., New Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901
Size: 2128px × 1174px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
