This experiment uses the principle of Sampling frequency, which is the frequency in the measurement signal at any time, there must be more than twice the frequency or frequencies of the incoming signal, Max. Call the appropriate frequency, Nyquist Sampling frequency if frequency that is less than the maximum frequency of the input signal, signal loss will occur, making the waveform has called Aliasing artifact caused by set. To set the sampling sample to read, which is a set of 2 x signal, t comes in.
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