Audio Signal Processing Using Filter (LP, HP, BP, BS) | MATLAB Tutorial

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In this instructable, we are showing how to apply filters (Low pass filter, high pass filter, band pass filter and band stop filter) on lively recorded voice.

Step 1: Clear Close Commands

Write:

clc (Clear window command)

clear all (To clear all written commands)

close all (To close all open tabs)

Step 2: Record Audio Using Microphone

Record your lively audio for filtering using microphone.

recordblocking(recording, 5);

Here, 5 is seconds of audio recording.

Step 3: Type Order of Filter and Sampling Frequency

Specify the order of filter and sampling frequency.

Here, N=8 order of filter

and Fc=0.2 sampling frequency

Step 4: Highpass Filter

Step 5: Record Audio

Wait for 'Speak' and start recording for five seconds and Stop when 'Stop' is display.

Step 6: Result of High Pass Filter

Frequency Response and Filtered result before and after apply filter.

Step 7: Low Pass Filter

Step 8: Results of Low Pass Filter

Frequency Response and Filtered result before and after apply filter.

Step 9: Band Pass Filter

Step 10: Result of Band Pass Filter

Frequency Response.

Step 11: Band Stop Filter

Step 12: Frequency Response of Band Stop Filter

Frequency Response.

Step 13: Complete Video Tutorial

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