用VHDL实现线性相位FIR滤波器

Use VHDL to Design Linear Phase FIR Filter

数字滤波器是语音与图像处理、模式识别、雷达信号处理、频谱分析等应用中的一种基本的处理部件, 它能满足滤波器对幅度和相位特性的严格要求,避免模拟滤波器所无法克服的电压漂移、温度漂移和噪声等问 题。有限冲激响应(FIR)滤波器能在设计任意幅频特性的同时保证严格的线性相位特性。因此,在许多应用领 域都显示了强大的生命力,具有重要应用意义。介绍了怎样用VHDL实现线性相位FIR(有限长单位冲激响应) 滤波器,论述了其设计思想。

Digital filter is a fundamental device used in pronunciation ＆ pattern process, pattern - recognition, radar signal process and spectral analysis. It can meet the high needs to range and phase, and can avoid such problems as voltage drifting, temperature drifting and noise that analogue filters cannot overcome. FIR filter can assure a strict linear phase identity while designing any range ＆ frequency. Therefore, FIR filter has shown its strong vitality in many fields and its importance in using. In the paper, the way to use VHDL to design linear phase FIR filter is introduced and its designing thoughts are expounded.