838 



BELL SYSTEM TECHNICAL JOURNAL 



TABLE XI 



Articulations for Two- and Three-Sound Syllables 



Two-sound Syllables . . 

 Three-sound Syllables . 



95 

 94 



87 



90 



number of syllables used of each type for determining these averages 

 was 1,344. The average sound articulation in each case was deter- 

 mined by giving equal weights to the articulation for each sound. 

 For the three-sound syllables this is done by dividing the number of 

 sounds correctly recognized by the total number of sounds called. 

 For the two-sound syllable the procedure is not so simple. Since 

 each vowel sound occurs twice as often as each consonant sound, 

 it is necessary to obtain an average for the vowels and consonants 



SOUND ARTICULATION VS. 

 NO. OF SPEECH SOUNDS CALLED 



NO. OF SPEECH SOUNDS CALLED 

 AT ONE TIME 



Fig. 8 



separately. The final average value for the sound articulation is 

 obtained by assigning weights of 1 and 2 to the vowel and consonant 

 articulations, respectively. It is seen that there is no appreciable 

 difference between the values of L obtained by the two types of lists. 

 In the third experiment the standard lists were used to test the 

 auxiliary circuit but the syllables were called in groups of 1, 2, 3, 4, 

 or 5 at a time. The results of these tests are shown in Table XII. 



