| 摘要 |
PROBLEM TO BE SOLVED: To enable a reverbrative indication by indicating an input signal value as it is when the input signal value fetched every constant period is not smaller than the peak level or indicating the input signal value by increasing the lowering amount with time when the input value is smaller than the peak level. SOLUTION: A microcomputer 3 fetches an input signal ID every constant period through a timer 3f and stores it in a memory 3a temporarily, then a memory 3b stores a peak level P temporarily and the peak level P is indicated by an indicator 5. A comparator 3c compares the level P with the respective signals ID storing in the memories 3a and 3b, and the signal ID is indicated by the indicator 5 through an amplifying circuit 4 at the time of the signal ID∞level P. At the time of the signal ID < level P, the level P is lowered greatly according to a program software with time elapse, allowing it to be closer to a quadratic curve starting from the level P, then the curve is indicated by the indicator 5. Thus, a reverbrative level can be indicated while the indicated value of the level P is not so far from the input value.
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