By this demo, you can use your iPhone to roughly measure the DB around, while the view will change up&down with the value, to make it more intuitive. Clutter and noise can't be avoided, and the filter is needed, so a simple average filter is written here. 通过这个demo, 你可以用你的iPhone手机粗略地测量周围的分贝数, 与此同时, 视图会随着数值的高低而改变高度, 来使其更直观. 杂波和噪音是无法避免的, 需要滤波处理, 这里写了一个简单的均值滤波器.
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A simple demo to measure decibel with your iPhone mic, which make the view up and down through the value. Though the noise waves exist, it is also contain a simple average filter.
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