Reza Filter

Reza Filter implements exponential low-pass, high-pass, band-pass, and band-stop filtering

Reza Filter provides exponential low-pass, high-pass, band-pass, and band-stop filtering via frequency-domain magnitude shaping. The primary interface is rezafilt, which supports an auto-tuned sharpness parameter (d) and an optional acceleration path via locally compiled C++ MEX (no precompiled binaries are distributed on File Exchange).

Basic usage (cutoffs in Hz):

Fs = 250;
x  = randn(10000,1);

% Low-pass (single cutoff)
y_lp = rezafilt(x, Fs, 10, 'low','UseMex','auto');

% High-pass (single cutoff)
y_hp = rezafilt(x, Fs, 10, 'high','UseMex','auto');

% Band-stop / notch
y_bs = rezafilt(x, Fs, [48 52], 'stop','UseMex','auto');

% Band-pass
y_bp = rezafilt(x, Fs, [5 50], 'bandpass','UseMex','auto');

Notes:

• x can be a vector (or matrix, filtered column-wise if supported in your implementation).
• UseMex='auto' uses MEX if available; otherwise it falls back to MATLAB implementation / non-MEX path.