ANALYZER FOR THE VOICE FREQUENCY RANGE 229 



will be exactly balanced over the frequency range covered by the carrier 

 oscillator and, therefore, frequency components such as {pt — 2qt)l2Tr 

 appearing in the third order modulation as shown in Table 1 are not 

 totally eliminated. However, the effect of unbalance is of no serious 

 consequence in the practical operation of the analyzer. There is, of 

 course, a possibility of false indications due to higher orders of modula- 

 tion than the fourth, but the coefficients Az, Ai, etc., are usually small 

 in comparison with A^. and in general become successively smaller. 

 Moreover, it will be evident that these false indications may be re- 

 duced to any desired extent by reducing the magnitude of the unknown 

 wave. 



