基于DDS技术的信号发生器设计，能产生正弦波，方波，三角波。-The signal generator design based on DDS technology, which can produce sine, square, triangle wave.

在拉普拉斯白噪声中估计正弦信号的频率，英文版本，详细的推导过程。-Estimation of the Frequency of Sinusoidal Signals in Laplace Noise，English version, the detailed derivation.