| 摘要 |
PURPOSE:To reduce a circuit scale and to simplify circuit configuration by using a memory instead of a delay unit, a selector and an adder. CONSTITUTION:Serial data to be transmitted is converted into parallel data and the high-order address of the memory 14 is designated by parallel data. The address length of the low-order address of the memory 14 is equivalent to one period of a diffusion code and it is designated by the output of a counter 13. Parallel data outputted from the memory 14 is D/A-converted and a converted analog signal is modulated by a carrier. Then, a multiplexed spectrum diffusion modulation signal is obtained. Then, the circuit scale can be reduced since the memory 14 is used instead of the selector and the adder. |
