| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect frame synchronizing signals of a header in a radio telegram independently of a control means. <P>SOLUTION: An interface unit 7 is equipped with a frame code register 11 that stores frame patterns of a frame synchronization unit, a frame synchronization shift register 12 which stores the frame patterns successively synchronizing with a sampling clock, a frame match detecting means 13 which outputs frame match detection signals when data stored in the frame code register 11 are matched with the data stored in the frame synchronization shift register 12, and a receiving buffer 14 which stores a data unit synchronizing with the sampling clock. The control means 16 of a CPU unit 8 is not required to detect the bit synchronization unit and the frame synchronization unit when a radio telegram is received, so that a load imposed on the control means 16 is alleviated, and the control means 16 is capable of carrying out other processing. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
