Finger attack speed detection system

TLDR: In this paper, the authors propose to detect the finger attack speed stably at a high accuracy with a compact construction by employing a digital arithmetic circuit equivalent to a time constant circuit with a resistance and a capacity.

Abstract: PURPOSE:To detect the finger attack speed stably at a high accuracy with a compact construction by employing a digital arithmetic circuit equivalent to a time constant circuit with a resistance and a capacity. CONSTITUTION:When a switch S1 is closed in response to finger attacking, a pulse corresponding to the keying timing is outputted to a data selection circuit 6 through an FF1, an FF3, a NOT circuit 4, an AND gate 5 and the like to select a numeral N which is memorized into a memory circuit 7. The multiplication of the memory contents by a specific coefficient with a multiplier 8, the selection of results of the multiplier 8 with the circuit 6 and the memory of selected output with the circuit 7 are done circularly to perform a digital computation equivalent of a time constant circuit with a resistance and capacity. The results of the computation are memorized into a memory circuit 9 whose latching is controlled with the FF2 for detecting the closing of a switch S2 delayed from the switch S1 in the keying and detected depending on the keying speed. Thus, the detection of the finger attack speed can be done stably at a high accuracy with a small LSI structure requiring none or such resistance, capacity and the like.