简单实用的音频周期性噪声抑制器-声学技术.PDFVIP

第 29 卷第 2 期 声 学 技 术 Vol.29, No.2 2010 年 4 月 Technical Acoustics Apr., 2010 简单实用的音频周期性噪声抑制器 黄瑞强 (江西理工大学，江西赣州 341000) 摘要：针对 LC 音频周期性噪声抑制器抑制频率调整困难和数字音频周期性噪声抑制器的成本高的问题，设计了一种 新颖的周期性噪声抑制器。方法是采用中心频率可调的 RC 串并联选频网络从音频信号中选出周期性噪声信号并加以 放大，使之与音频信号中的周期性噪声信号大小相等，相位相同，然后通过减法运算电路将原音频信号减去所选出 和放大的周期性噪声信号。通过理论分析、电路仿真和样机实验证明了其可行性。这种周期性噪声抑制器不仅抑制 频率在音频范围内可调，而且结构简单，成本低，实用效果良好，特别适用于抑制剧场、歌厅、礼堂和家庭等场所 音响系统的周期性噪声。 关键词：音频信号；噪声抑制；周期性噪声；RC 串并联选频网络 中图分类号：TN912.2 文献标识码：A 文章编号：1000-3630(2010)-02-0180-04 DOI 编码：10.3969/j.issn1000-3630.2010.02.0013 A simple and practical audio periodic noise suppressor HUANG Rui-qiang (Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China) Abstract ：Regarding that the suppression frequency of LC audio periodic noise suppressor is hard to adjust and the cost of digital audio periodic noise suppressor is high, a novel periodic noise suppressor is designed, in which the periodic noise is selected and enlarged through a RC series-parallel frequency-selective network with adjustable center frequency and scaling circuit. The amplitude and phase of the periodic noise is adjusted to be equal to the periodic noise signal which contains in the audio signal, and then the original audio signal subtracts the selected and amplified periodic noise through a subtraction circuit. The feasibility is proven through theoretical analysis, circuit simulation and prototypical experiment. It is shown that not only the suppression frequency is adjustable in audio frequency range, but also the structure is simple, the cost is low, and the practical effect is good.