动态处理结合非线性设备的虚拟低音增强系统

Virtual bass enhancement system based on dynamic range processing and nonlinear device

现代声学产品由于物理尺寸的限制,在低频很难达到令人满意的效果。通过虚拟低音的方法,可以诱发人脑从各个谐波中感知到基频,极大地提升了人对低频的主观感受。非线性设备(Nonlinear Device,NLD)是基于时域的一种主流处理方法,不同类型的NLD会产生不同的谐波特性,其中基于ATSR(Arc-Tangent and Squire Root)方法可以同时产生奇次和偶次谐波,但谐波比例与输入信号幅值相关,通过在ATSR方法前增加动态处理模块可以进行有效的谐波成分控制,实现了对不同幅值输入信号低音增强的灵活控制。

Modern portable devices demand small-sized and compact loudspeaker,the physical acoustic bass reproduction is usually poor. Virtual bass system is commonly applied to such audio systems with limited bass extension,and brain to perceive low frequencies from harmonics. NLD( Nonlinear Device) is an important processing block in time domain to generate harmonics for virtual pitch perception,the characteristic of harmonic varies according to NLD methods. Arc-Tangent Square Root function,which can be used to control the pitch perception by a set of parameters,since ATSR is sensitive to the amplitude of input signal. Dynamic Range Processing module can be used to control the input level so as to apply different bass enhancement character flexibly.