我的最终目标是从单波文件中提取所有低于 15KHz 的音频信息。 程序会将样本装入内存, 并显示为 16bit 签名的整数阵列 。
我使用FFFTW, 它有几个功能, 如复杂的多维功能, 真正的多维功能, 真正的一维功能, 复杂的一维功能。
我该用什么方法做这个?
谢谢
您需要首先转换为浮/ 双轨阵列, 然后可能使用 1D 实际至复合模式(见 < a href="http://www.fftw.org/fftw3_doc/One_ 002dDdimensional- DFTs-of- Real- Data.html" rel=“nofollow” > http://www.fftw.org/fftw3_doc/One_ 002dDimensional-DFTs-of- Real- Data.html 。
如何使用 FFFT 取决于您想要的信息。 在音频上使用 1D 真实 FFFT 时, 有时间频率解析取舍, 每个垃圾过滤器响应取舍, 以及其他您需要首先回答的问题。 您还需要知道数据样本率 。
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