Wave, various contracts have been used to enhance jobs of various types, but the electrical system because it signals that may not conform to the requirements of every type of work, we have to bring the signal through a filter, output suitable to apply the most. This article is intended for education and low frequency signals through the baepwongchonkrong by using the quick ria for Fu to bring improvements in the time domain signals with a frequency appropriate to use. Trial by FIR filter design, window function method for solving a problem because window function helps to limit the range of good and bad.
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