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iir

于 2014-02-17 发布 文件大小:7KB
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  语音信号的iir滤波器设计,从带有噪音的信号中提取原始声音.目前,MP3播放器一般功率放大器的工作频率范围就是这个范围。但是大部分有用的和可理解的信息的频率在200到3500Hz之间。所以我们可以在这个范围间滤波,达到使声音可理解的要求。现将数字滤波器的设计指标设为通带截止频率fb=600HZ,阻带频率fc=1200HZ,通带波纹Ap=1dB,阻带波纹As=40dB,要求确定H(z)。(design of the iir filter, get the original voice without noise)

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