1984, To the measured values of control pulses crest ultrasonic

摘要

18 for controlling the ultrasonic signal is sent after amplification is a comparator is ed ris tho 28 whose output is connected to a memory 36 at the start of time intervals periodicals and whose width corresponds to an echelon ed ris tho voltage that can be modified by echelon supplied by a converter digital-analog 46, which is controlled by a counter, 1984, 44, the counting direction is a function of the contents of the specification and which, in the case of equality between the signal received in one of said slots and the respective reference voltage is brings a zero, a display as determine the final state of the counter. / p & & p & application in particular to control by ultrasonoscopie.