166 



Lawrence S. Frishkopf and Walter A. Rosenblith 



RESPONSE TO CLICK 

 ALONE 



CLICK INTENSITY 

 IN DB 

 (RE 1.29 VOLTS) 



CLICK RESPONSE IN RELATIVE 



PRESENCE OF NOISE GAIN 



(-82 DB RE 1.29 VOLTS) 



-60 



ODB 



-50 



-40 



^x^ 



v/-' 



-30 



•12 03 



-20 



-10 



-3 m sec - 



-3 msec- 



Fig. 15. Ink tracings of responses obtained from an anesthetized cat to clicks 



over a 60-dB range, with and without background noise; noise level, —82 dB. 



Note that the voltage gain of the recording equipment was reduced by 12 dB 



(factor of i) at a click intensity of -30 dB. 



