| 摘要 |
PURPOSE:To take synchronization at the transmission/reception side without spreading the transmission band by providing a clock frequency control circuit operated as specified in the scramble system. CONSTITUTION:The signal is sampled by an output of a clock freqeuncy control circuit 6 at the sending side and scramble processing is applied by changing the clock frequency f1(t) written in a RAM 3 and a clock frequency f2(t) read from a RAm 3. Conversely, a clock freqeuncy control circuit 16 at the receiving side writes a signal in a RAM 13 in the clock frequency f2(t) and reads the signal in the clock frequency f1(t) to decode the signal. The frequencies f1(t), f2(t) are changed in the period of the sum of the delay times in the RAms 3,13 at the transmission/receiving sides. Thus, the synchronization is taken at the transmission/reception sides without spreading the transmission band.
|
