| 摘要 |
PURPOSE:To make an accurate decision by storing a signal of received strike sound and dividing it into plural sections with time, inverting waveform signals of the sections at every turn and connecting them, and generating a time- expanded signal by repeating said operation and comparing it with registered signals. CONSTITUTION:A strike hammer 40 is equipped with a load meter 41 and a microphone 42 is provided nearby the strike hammer 40. The strike sound received by the microphone 42 is inputted to a primary storage circuit 45 through a preprocessing circuit 43 and an AD converting circuit 44 and stored there. A repetitive waveform generating circuit 46 divides the primarily stored strike waveform signal into plural sections, inverts and connects waveform signals of the sections, and repeats said operation necessary times to generate a time- expanded signal. Further, this time-expanded signal is inputted to a sound decision circuit 47 and compared with registered signals to decide on the degree of the separation of tiles. |
