摘要
虚拟低音技术针对扬声器低频重放问题提供了一种较好的处理方式,其建立在"虚拟音高"理论基础上,将扬声器输入信号在不能重放的低频部分利用其高次谐波成分在听感上虚拟出基频音高。考虑到小型扬声器频带窄、失真大等特性,在虚拟低音的相位声码器算法基础上,用二阶求导的方式对频谱低频峰值进行取点,对不同频段生成不同的谐波个数,简化幅度控制,提出适合于小型扬声器的低音谐波生成模块优化算法并实现。主观实验结果表明改进后的算法在增强低音效果的同时也能保证较好的整体音质效果。
The virtual bass technique provides a good approach for the bass reproduction of speakers.lt is based on ＂ virtual pitch＂ theory, which uses multiple harmonic generation to generate the low frequency part that speakers could not reproduce.Considering the narrow band and large distortion of small speakers, this paper presents an improved method based on virtual bassphase vocoder algorithm.This method uses a second order derivative of the low frequency spectrum to find a peak point, then generate different harmonic parts for different frequency part.The results of subjective evaluation experiment show that the optimized algorithm can enhance bass performance and ensure good sound quality simultaneously.
出处
《电声技术》
2016年第5期19-21,34,共4页
Audio Engineering
