音频信号处理中常用的fir滤波器， 提供了各种窗函数的计算函数，提供了低通滤波器、高通滤波器、带通滤波器、带阻滤波器的设计与实现代码，并提供了例子程序-fir filter , supply lpf,hpf,bandpass and bandstop filter design and implemention

New AAC encoder, default settings can supply good quality audio 1.This aac encoder is one part of falab and developed on Linux, the source code is highly modulated, can easyly extracted and study. 2.Support MPEG-2 AAC, give good quality and 6 sp