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STFT的频谱分析是当前时刻往后数8192点,而CQT的频谱分析是以当前帧的中心为窗的中心,因此前面几帧,在低频部分,会由于窗过长导致能量不够,导致值小。我认为再怎么样也不会是0,所以过滤了CQT中的0值,没想到解决了边缘效应。但是就算是最前面不应该也是有值的吗,为什么会是零呢……