There are several techniques to perform noise reduction in Matlab. One common method is to use digital filters to remove noise from the signal. Here is an example of how to use a low-pass filter to reduce high frequency noise:
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In this example, a noisy sine wave is generated and a second-order Butterworth filter is used to remove the noise. The resulting filtered signal is then plotted along with the original noisy signal. You can adjust the filter parameters to obtain different levels of noise reduction.
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