这是用三角窗设计的FIR低通滤波器，来消除音乐信号的噪声-This is the triangular window design FIR low-pass filter to eliminate the noise signal Music

dds信号发生器，基于单片机的信号发生器，可以产生三角波，正弦波，方波。-dds signal generator, microcontroller-based signal generator can generate triangular wave, sine wave, square wave.

generation of various periodic and non periodic signals and sequences such as sine wave, square wave, impulse , triangular wave, step signal and sinc wave fomrs