音频波形显示和滤波,1、录音功能：CWaveIn类2、播放功能:CWaveOut类3、波形显示和滤波：CFilter类4、语音数据压缩解压：CG729aCompress、CGsmCompress 因为继承至同一个父类，所以它们的接口是一样的, Audio frequency profile demonstration and filter,1, recording function: CWaveIn kind 2, broadcast function: CWaveOut kind 3, pr