. The Bell System technical journal . cillograms, but analysis of this information is outside the scope ofthis paper. To facilitate inspection of the speech traces the voice energy fromthe circuit was routed through quick-acting automatic volume controlswhich permitted the weak beginnings and endings of words to be - The designation H-44 means 44 millihenry loading coils spaced 6000 feet apart.^ An Oscillograph for Ten Thousand Cycles, A. M. Curtis, Vol. XII, No. 1, TIME INTERVALS IN TELEPHONIC CONVERSATION 285 observed without producing excessive amplitudes of the recordingstrings d
. The Bell System technical journal . cillograms, but analysis of this information is outside the scope ofthis paper. To facilitate inspection of the speech traces the voice energy fromthe circuit was routed through quick-acting automatic volume controlswhich permitted the weak beginnings and endings of words to be - The designation H-44 means 44 millihenry loading coils spaced 6000 feet apart.^ An Oscillograph for Ten Thousand Cycles, A. M. Curtis, Vol. XII, No. 1, TIME INTERVALS IN TELEPHONIC CONVERSATION 285 observed without producing excessive amplitudes of the recordingstrings during the strong parts of speech. These devices, as used,distorted the recorded envelope of the speech sounds considerably, butassisted materially in showing just where speech traces started andstopped. Noise occasioned little difficulty in this study. When ob-servable, the traces of the noise were so characteristic that little con-fusion with speech waves resulted. BELL TELEPHONE LABORATORIES, NEW YORK r AUTOMATIC 1 1 VOLUME CONTROL. Fig. 1—Connections to New York-Chicago tie line to obtainoscillograms of conversations. Some observations of response and resumption time were lost whendouble talking occurred, because echo suppressor operation introducedappreciable loss into one side or the other of the recording circuit.^High gain in the automatic volume control and high speech volumes,however, permitted many of such instances to be properly is little reason to believe that the instances lost were frequentor that they differed in any particular regard from those recorded;such instances occurred only in the event of double talking involvingweak speech by the responding talker. Instances in which double talking was clearly recorded required acertain amount of arbitrary judgment to decide whether the responsewas induced by a resumption pause or represented a negative responsetime. Usually the structure of the conversation was evident, but it isrecognized that in so
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