| 摘要 |
PURPOSE:To detect the presence of a data independently of the length of a multiplexed input signal by differentiating a clock synchronized with the input signal to AND it with the input signal. CONSTITUTION:The clock 7 synchronized with the multiplexed input signal 6 is differentiated by a differentiation circuit 12 to form a signal (a). The signal (a) and the input signal 6 are ANDed (AND circuit 13), the presence or absence of the data is changed to the presence of absence of a pulse to set a register 14. Then a frame pulse 9 resets the register 14 and also a register value is outputted from an FF circuit 15. Through the processing above, the presence or absence of the data is detected independently of the length of the multiplexed input signal. |
