数字声场处理器的分频法设计

声场处理器的冲激响应具有较长的长度,使用目前滤波器的设计方法很难在TMS320C5402 DSP芯片上实时实现.本文提出一种将高中低频段分别处理的方法.首先对冲激响应的低频段进行抽取;再将冲激响应的高频部分予以截断.中频段的处理结合了上述两种方法,即对冲激响应的中频段先进行抽取再适当截断.这一方法减少了声场处理器的存储量和计算量,对于芯片能够在使误差、存储量较小的条件下达到实时处理,无需片外存储器.

Research on the design of digital sound-field processor

The impulse response of a digital sound-field processor often has a very long length,which makes the real-time processing very difficult under.This lener process the low-frequency part,middle-frequency part,and high-frequency part separately.That is,the low-frequency parts of input signal and impulse response are decimated the high frequency part of that are cut douin The processing of the middle-frequency part incorporated the above two methods,that is,decimating and then cutting.This method reduces calculation and store of a digital sound-field processor,and for TMS320C5402 DSP,this method can achieve real-time processing under small error without any extra store.