为了压缩信息量，所以把FFT改成计算速度更快的DCT。
In order to compress information, FFT is replaced by DCT. Which can provide much faster computing rate.
他计算速度永远不会变得更快，驾驶技术永远不会变得更好，甚至飞行过程也不会变得更安全。
He'll never calculate faster, never drive better, or even fly more safely.
用户可以用更高的误差来换取更快的计算速度，不过这个程序已经能在不到1秒的时间获得小于百分之一的误差。
The user can opt to trade speed of computation for a higher margin of error, but the app can generally get the error under 1 percent in less than a second.
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