. BSTJ 1: 1. July 1922: The Nature of Speech and Its Interpretation. (Fletcher, Harvey) . g 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 so com- 2Fletcher and Wegel, Proc. Nut. Acad. Science, Vol. 8, Xo. 1, pp. 5-6, Ja
. BSTJ 1: 1. July 1922: The Nature of Speech and Its Interpretation. (Fletcher, Harvey) . g 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 so com- 2Fletcher and Wegel, Proc. Nut. Acad. Science, Vol. 8, Xo. 1, pp. 5-6, Jan., 1922. 138 BELL SVSTEM TECHNICAL JOURNAL plicated that such service would be altogether too costly for com-mercial use; people could not afford to pay for it. The Relation Between the Volume and Articulation ofUndistorted Speech Articulation tests were made upon the high quality telephonesystem described above when it was set to deliver various intensi-ties from the threshold of audibility to very large values. Theresults shown as syllable articulation values are given by the curve. Fig. 4. in Fig. 4. The abscissas in this curve represent loudness and areexpressed as the natural logarithm of the number of times the speechwave amplitude has been decreased from the initial intensity at}/l inch in front of the mouth of the callers. This unit of loudnesshas never been given a name, and as a matter of convenience inthis work it is called a napier. It will be noticed that when thevolume is reduced W^/i napiers below the initial speech intensitythe articulation becomes zero. This point also represents the valueat which the speech becomes inaudible and corresponds to approxi-mately 1/1000 dynes per square centimetre pressure variation againstthe ear drum. In energy units it is a reduction of ten billion timesbelow the initial speech intensity. For very loud initial speechthis point is shifted about 1 napier. For purposes of comparisonthe intensity reductions are also indicated on th
Size: 2066px × 1209px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectspeech, bookyear1922
