音频多段均衡处理算法研究与DSP实现  

Research on Audio multi-band equalization processing algorithm and DSP realization

作　　者：姚丽娜[1] 马天阳 Yao Lina;Ma Tianyang(College of Electronics and Information,Xi'an Polytechnic University,Xi'an 710048,China)

机构地区：[1]西安工程大学电子信息学院,西安710048

出　　处：《电子测量技术》2022年第1期43-48,共6页Electronic Measurement Technology

基　　金：国家自然科学基金(61902301);陕西省教育厅科学研究计划(21JK0661)项目资助。

摘　　要：针对音频不同播放设备的频率响应不同的特点,设计了一种用于音频频率均衡调节与噪声消除的Equalizer算法并在DSP上进行实现。基于数字信号处理时域滤波原理,设计了不同频段可通的IIR低通及高通滤波器,不同频带设置不同的增益,输入音频经过IIR滤波器后的输出信号进行叠加,实现音频在不同频率处能量改变的调节效果;同时设计了单独且可控的噪声抑制器,其由50阶的FIR带阻滤波器组成,用于指定频率的噪声衰减。测试表明,该算法最高可处理16 kHz的16 Bit数字音频信号,实现了对特定频段噪声的滤除。In view of the different characteristics of the frequency response of different audio playback devices,the Equalizer algorithm for audio frequency equalization adjustment and noise elimination is designed and implemented on the DSP.Based on the principle of time-domain filtering in digital signal processing,the IIR low-pass and high-pass filters that can pass through different frequency bands is designed.Different frequency bands are set with different gains.The output signal after the input audio passes through the IIR filter is superimposed to realize the audio regulating effect of energy changesat different frequencies;at the same time,the separate and controllable noise suppressor is designed,which is composed of a 50-order FIR band-stop filter for noise attenuation at a specified frequency.The test shows that the 16 Bit digital audio signalup to 16 kHz can be processed,and the filtering of noise in a specific frequency band is achieved.

关 键 词：音频处理 DSP 频率均衡 时域滤波 FIR IIR 

分 类 号：TN99[电子电信—信号与信息处理]