TELEPHONE TRANSMITTERS AND RECEIVERS 627 



Furthermore, any compromise in the instrument characteristics to 

 favor the line noise conditions, should not have an adverse effect on 

 the many connections on which noise from power systems is unimport- 

 ant. As has been noted, a material shift in this maximum response 

 would have a marked effect on the naturalness of the reproduced 

 sounds. On the whole, then, no advantage to the interference situa- 

 tion has yet been indicated for shifting the resonance of the receiver. 

 In accordance with these considerations, the present effort in the 

 development of telephone transmitters and receivers is being directed 

 along the lines of reducing the deviation between their maximum and 

 average responses. Any improvements in the instruments which it 

 may be found practicable to make will be in the direction of increasing 

 the intelligibility and naturalness of the telephone conversations, and 

 the justification for their adoption will include their effectiveness in 

 the presence of typical distributions of interfering currents on the tele- 

 phone lines. 



