FIR(Finite Impulse Response)滤波器：有限长单位冲激响应滤波器，又称为非递归型滤波器，是数字信号处理系统中最基本的元件，它可以在保证任意幅频特性的同时具有严格的线性相频特性，同时其单位抽样响应是有限长的，因而滤波器是稳定的系统。-FIR (Finite Impulse Response) filters: finite impulse response filter units, known as non-recursive filters, digital signal processing system is the most basic element, it can be guaranteed any amplitude-frequency characteristics of both strict linear phase-frequency characteristics while the unit sample response is finite, so filter is a stable system.