Abstract: The invention relates to a discharge monitoring circuit for a peak value store which detects and stores the voltage peaks of a periodic signal with varying amplitude in each period. If at the end of a period, the peak of the periodic signal to be stored, in relation to the peak of the immediately preceding period, is smaller by more than a defined settable percentage ratio, a correction circuit is activated to completely discharge, in this case, the store capacitor of the peak value store, so that the voltage at the store capacitor is again able to follow the peak values of the signal. A low-pass mean value generator connected downstream then produces an envelope for the peaks of the periodic signal.