Breaker and O'Neil 



CARRIER SAMPLER 



AND 

 ENVELOPE DETECTOR 



ENVELOPE 

 OUTPUT 



CLOCK CONTROL 



CLOCK 

 OUTPUT 



RECORD 



— o 



CLOCK PULSE 

 GENERATOR 



SIGNAL DETECTION 

 INTERFACE 



MIXED DATA 



ZERO 

 CROSSINGS 



DETECTION 



SQUARE WAVE 



DIGITAL DETECTION 

 LOGIC 



ENVELOPE 

 AND BIAS 

 OUTPUT 



CLOCK 

 OFF 



END-OF 

 RECORD 



DIGITAL INTERFACE 

 TIMER 



END OF 

 CONVERSION 



PLAYBACKS 



TIME 

 VOLTAGE GENERATOR 



STROBE 



DIGITIZER 



TIME 

 CHANNELS 



DATA 

 CHANNELS 



DATA LOGGER 



STEP PULSE 



M ., , ,. , . 



CLOCK 

 OUTPUT 



DATA 

 CHANNELS 



BUFFER STAGES 



END-OF-RECORD 



GAP IN PROCESS 



1GATE r 

 BIAS T, 

 Li 



GATE 

 PULSE 



CLOCK PULSE 

 CHANNEL 



-P 



^, 



SANBORN 

 RECORDER 



END-OF-SIGNAL 

 DETECTIONCIRCUIT 



CLOCK PULSE 



Fig. 3 - Block diagram of digitizing system 



377 



