| 摘要 |
PURPOSE:To transmit an offset signal up to the next break of a signal by deciding on the break of a signal when a signal-break supervising circuit detects coincidence between sign bits in two continuous sampling operations. CONSTITUTION:Signal-break supervising circuit 50 exercises a supervision over sign bit MSB, showing the positive or negative polarity of a sound input analog signal, of a digital signal outputted from logic circuit 15. Namely, sign bit MSB is applied to input D of FF51 in circuit 50 and also to one input of exclusive OR circuit 52. To the other input of circuit 52, output Q of FF51 is applied. In this case, since sampling signal Ts is applied to terminal CLK of FF51, circuit 52 compares sign bits in two continuous sampling operations eventually. Then when circuit 50 detects sign bits in two continuous sampling operations agreeing in sign, a decision on the break of the signal is made and an offset signal is transmitted up to the next break. |
