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BELL SYSTEM TECHNICAL JOURNAL 



of two stations. While the distortion products loom large in propor- 

 tion to the fundamental at times, these are also the times when the fun- 

 damental is fading out and the actual magnitude of the distortion prod- 

 ucts is not large. 



3-20 



z 



0-24 



-28 



30 



r 



60 90 120 150 



RADIO PHASE ANGLE IN DEGREES 



Fig. 16 — Same as in Fig. 15 except that EijE^ = 0.707. 



In practice, broadcast programs do not consist of a single frequency 

 but represent instead a complex frequency distribution. The distor- 

 tion resulting from the reception of such a program therefore repre- 

 sents a general average of all the different conditions shown in the 

 curves given above. These are averaged in the final analysis by the 

 listener, whose ear is far from linear in its response and whose judg- 

 ment is affected by his personal opinions and past experience. We 

 have therefore considered it futile and perhaps misleading to at- 



