LFM信号，通过IQ解调，再A/D变换，上变频，分析输出信号频谱-LFM signal, through the IQ demodulation, and then A/D conversion, on the frequency, the output signal spectrum analysis

matlab simulink 开发的CDMA2K DDC数字下变频器和滤波器，使用XILINX FPGA V5系列，并包含DDC每个阶段的输出验证matlab程序，非常实用。-matlab simulink developed CDMA2K DDC digital down converter and filter, using the XILINX FPGA V5 series, and contains the output of each stage of verification DD

信号带宽30MHz,输入采样率96MHz,输出采样率32MHz，抽取倍数为3的数字下变频DDC的Matlab仿真程序-Signal bandwidth of 30MHz, the input sample rate of 96MHz, the output sampling rate of 32MHz, extracted 3 times DDC DDC in the Matlab simulation program

1 录入一段语音，对其进行时域频域处理，通过变频、变速达到变声目的，且使处理后的语音信号不影响正常收听与理解。 2 用图形用户界面（GUI）对上述变声前变声后进行时域频域图形输出，不同的频率、速度有不同的输出，且对前后波形进行比较 -1 entry a voice, the frequency domain and time domain by frequency conversion variable speed, processing to make the treatment an

设计一个AC/DC/AC变频器设计，具体参数如下：三相交流输入380V/50Hz，三相输出交流电压500V/400Hz,THD<5 ,负载为一般的阻感负载，功率5000W。-Design of a AC/DC/AC converter design, the specific parameters are as follows: Three-phase AC input 380V/50Hz, three-phase output AC voltage 500V/400Hz, THD <