Peak signal circuit with particular filter means

Claim 1

APPARATUS FOR USE IN MEASURING PEAK VALUES OF ELECTRICAL SIGNALS COMPRISING A PHASE CORRECTED FIRST BUTTERWORTH FILTEER MEANS ADAPTED TO PASS FREQUENCIES LESS THAN A PRESELECTED VALUE, A DERIVATIVE PHASE CORRECTED SECOND BUTTERWORTH FILTER MEANS , MEANS TO TRANSMIT A SIGNAL TO BE MEASURED THROUGH EACH OF SAID FILTER MEANS, WHEREBY THE OUTPUT SIGNAL FROM SID SECOND FILTER MEANS IS 90* OUT OF PHASE WITH THE OUTPUT SIGNAL FROM SAID FIRST FILTER MEANS, A DIFFERENTIATING CIRCUIT HAVING THE INPUT THEREOF CONNECTED TO THE OUTPUT OF SAID SECOND FILTER MEANS, OUTPUT CIRCUIT MEANS, MEANS CONNECTING THE OUTPUT OF SAID DIFFERENTIATING CIRCUIT MEANS TO SAID OUTPUT CIRCUIT MEANS, UNIDIRECTIONAL CURRENT FLOW MEANS CONNECTING THE OUTPUT OF SAID FIRST FILTER MEANS TO SAID OUTPUT CIRCUIT MEANS, TO PASS CURRENT FROM SAID FIRST FILTER MEANS TO SAID OUTPUT CIRCUIT MEANS, AND SIGNAL CLIPPING MEANS CONNECTED TO THE OUTPUTS OF SAID FIRST AND SECOND FILTER MEANS.