Auto and cross correlation on-line computer

Claim 1

A SYSTEM FOR CONTINUOUSLY DETERMINING THE CORRELATION FUNCTION BETWEEN TWO WAVES OF VARYING AMPLITUDE, COMPRISING A FIRST PULSE MODULATOR FOR CONVERTING THE FIRST WAVE INTO PULSES HAVING A REPETITION RATE DEPENDING ON THE INSTANTANEOUS AMPLITUDE THEREOF, FIRST AND SECOND MEMORY DEVICES EACH HAVING A CIRCULAR SERIES OF MEMORY LOCATIONS AND SELECTOR MEANS AND SCANNING MEANS THEREFOR, MEANS CYCLICALLY ENTERING SAID PULSES INTO A SELECTED ONE OF THE LOCATIONS IN THE FIRST DEVICE TO OBTAIN A COUNT THEREOF AFTER FIRST ERASING THE PREVIOUS COUNT ENTERED THEREIN, MEANS IN SAID FIRST DEVICE FOR SCANNING SAID SERIES OF LOCATIONS DURING EACH CYCLE BEGINNING AT THE LOCATION FOLLOWING THE THEN SELECTED LOCATION TO PRODUCE A SERIES OF ANALOG VALUES CORRESPONDING TO THE COUNTS IN SAID LOCATION, THE PULSES DURING SUCCEEDING CYCLES BEING ENTERED INTO SUCCESSIVELY SELECTED LOCATIONS IN SAID SERIES, A MULTIPLIER, MEANS APPLYING SAID ANALOG VALUES AND SAID SECOND WAVE INTO SAID MULTIPLIER TO PRODUCE A PRODUCT THEREOF, A SECOND PULSE MODULATOR COUPLED TO SAID MULTIPLIER TO CONVERT SAID PRODUCT INTO A DATA PULSE TRAIN, MEANS ENTERING THE PULSES IN SAID TRAIN IN SYNCHRONISM WITH THE SCANNING ACTION INTO SUCCESSIVE LOCATIONS IN SAID SECOND MEMORY DEVICE TO OBTAIN THE COUNT THEREOF, MEANS TO SCAN THE LOCATIONS IN SAID SECOND DEVICE TO OBTAIN AN OUTPUT SERIES OF ANALOG VALUES REPRESENTATIVE OF THE CORRELATION FUNCTION AND MEANS TO RECORD SAID OUTPUT VALUES TO PRODUCE A CURVE.