FIR Bandpass Filter Design Using Rectangular Window Method for Music Signal Denoising

In this paper, we design an FIR bandpass filter using the rectangular window method to effectively remove noise from music signals. The rectangular window approach is a fundamental filter design technique that achieves filtering by convolving the input signal with a rectangular window function. This method involves calculating ideal filter coefficients first, then applying the window function to truncate the infinite impulse response to a finite length. The implementation typically includes defining passband frequencies, determining filter order, and generating coefficients using MATLAB's fir1 function with a rectangular window (boxcar). This design approach enhances music signal quality by improving clarity and purity. By applying this filter, we eliminate noise interference in music, thereby delivering an improved auditory experience. Thus, FIR bandpass filter design using the rectangular window method proves effective for enhancing music signal quality and increasing clarity through precise frequency domain manipulation.