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Design Low-Pass Filters using MATLAB

A low-pass filter is a filter that allows signals below a cutoff frequency (known as the passband) and attenuates signals above the cutoff frequency (known as the stopband). By removing some frequencies, the filter creates a smoothing effect. That is, the filter produces slow changes in output values to make it easier to see trends and boost the overall signal-to-noise ratio with minimal signal degradation. Low-pass filters, especially moving average filters or Savitzky-Golay filters, are often used to clean up signals, remove noise, perform data averaging, design decimators and interpolators, and discover important patterns. Other common design methods for low-pass FIR-based filters include Kaiser window, least squares, and equiripple. Design methods for IIR-based filters include Butterworth, Chebyshev (Type-I and Type-II), and elliptic. For more information on filter design, including these methods, see Signal Processing Toolbox™ for use with MATLAB®. Of particular interest is the built-in filter visualization tool, which you can use to visualize, compare, and analyze different filter responses.




Adaptive and non-adaptive data hiding methods for grayscale images based on modulus function report