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本文探讨了应用数字多带滤波器将信号在频域划分,分别处理,从而去除旧录音载体中一类宽频谱随机噪声的方法。本文选择多相网络DFT滤波器组来实现多带滤波,多相网络原型滤波器为FIR型,用Kaiser窗口法设计,并引进削波器作去噪声处理。通过大量的计算机仿真实验对系统进行了考察,证明方案可行,去噪效果显著。
This paper explores the application of digital multiband filters in the frequency domain signals are divided, respectively, so as to remove the old record carrier a wide spectrum of random noise method. In this paper, multi-phase network DFT filter bank is selected to realize multi-band filtering. The multiphase network prototype filter is FIR type, which is designed by Kaiser window method, and a clipping device is introduced for denoising. Through a large number of computer simulation experiments on the system were investigated to prove the feasibility of the program, denoising effect is significant.