基于FPGA的可“调色”有色噪声发生器设计

Design of Adjustable Colored Noise Generator Based on FPGA

有色噪声是一种分布广泛、频谱多样、频率能量分布不均匀的随机信号;有色噪声根据功率谱密度不同可划分成不同"颜色"的噪声,不同"颜色"的噪声在不同领域发挥着各自重要的作用;为获得不同"颜色"的有色噪声,文章提出一种噪声颜色可变的有色噪声产生方法,该方法根据有色噪声的自回归-滑动平均模型,利用m序列、映射法和ARMA模型滤波法,产生功率谱可调的各种(高斯)有色噪声,并在FPGA上了实现该方法;测试表明:这种信号发生器不仅可以连续产生颜色差异细微的各种有色噪声(包括白噪声),且噪声性能好。

Colored noise is a kind of widely distributed,diverse spectrum and frequency energy unevenly distributed random signal.Depending on the power spectral density,colored noise can be divided into different ＂colors＂,the different ＂color＂ of the noise in each of the different areas play an important role.To obtain different ＂colors＂ of colored noise,this paper proposes a noise variable color colored noise,the method based on autoregressive moving average model of colored noise,using the method of m sequence,mapping method,and ARMA model filtering method,producing adjustable power spectrum of various（gaussian） colored noise,and implementing on the FPGA.Tests show that the generator can not only continuously produce subtle color difference of all kinds of colored noise（including white noise）,but all the noise performance is good.