Lowpass FIR filter on .wav file with windowing

it implements a lowpass filter with Windowing on a WAV file

Description

Plots Rectangular, Hamming and Flat top WINDOWS responses. Also plots the spectrum of the wav signal before and after applying the lowpass filter. Then writes the WAVs of these signals.

Parameters that were made to be set:
-file name (file_1)
-time taken from wav (analysis_time)
-filter order (filter_order)
-cutoff frequency of the lowpass filter (cutoff_freq)

***Please report anything wrong or missing, I'll fix it soon. Thank you***

• MATLAB release: MATLAB 7 (R14)