设计的一个ask调制器与解调，输入时钟clk，输入开始信号start，输入基带数据信号din及输出已调信号ask-Designed to ask a modulator and demodulator, the input clock clk, enter a start signal start, enter the baseband data signal din and the output modulated signal ask

在QUARTUS II 8.0下做的基于DDS的多功能调制器，可实现ASK、FSK、BPSK调制。用SIGNALTAP仿真测试正确。-A In multi-function modulator based on DDS in QUARTUS II 8.0 , can realize the ASK, FSK, BPSK modulation. With SIGNALTAP simulation test right.