| 摘要 |
<p>PURPOSE:To perform communication with the same transmission rate as a transmission signal even when the signal is enciphered by providing a synchronization supervisory decision means to supervise the number of data bits between identification bits of a signal encoded on the reception-side and by making said number integer-times of a predetermined bit number. CONSTITUTION:A reception signal 120 is inputted to a frame pattern detecting circuit 11 and a frame-interval-bit counter 12. The circuit 11 detects the identification bit positioned before the data bits and that positioned after the data bits, and transmits a trigger signal 121 to the counter 12 and a decision circuit 13. The counter 12 counts the number N of the data bits between said two identification bits, and outputs it to the decision circuit 13. The decision circuit 13 outputs a normal pulse signal 122 to a normal pulse counter 14 when the number N of the counted data bits is a number integer-times of the prescribed number of bits. When said number is otherwise, the circuit 13 outputs an abnormal pulse signal 123 to an abnormal pulse counter 15.</p> |
