Abstracts of Technical Papers by Bell System Authors

Abstracts of Technical Articles by Bell System Authors Philosophical Magazine, February 1940. * Jour. S. M. P. E., March 1940. 1 336 ABSTRACTS OF TECHNICAL ARTICLES 337 quaver, or a single voice may accompany itself at any desired musical interval--thus converting a solo into a duet, etc. Also non-speech sounds may be coded into intelligible speech and instrumental music into vocal music. Statistical Measurements on Conversational Speech. H . K . DUNN and S. D . W H I T E . 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 oneeighth- 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-eighthsecond 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. Auditory PatternsHARVEY FLETCHER. During the last two decades considerable progress has been made in understanding the hearing processes taking place when we sense a sound. The application of the same instrumentalities that have brought such a wonderful development in the radio and sound pictures to this problem is largely responsible for this progress.