Problem of removing noise from an audio signal using filters on matlab. I am not

Question

Problem of removing noise from an audio signal using filters on matlab. I am not actually sure how i would go at solving this problem right here so any help or advice would be appreacited. Also if you want to see the .mat files I could send them to you, I just didnt see any way of doing it here on chegg.

I posted pictures of the frequency plots to look at:

The first plot is the bad signal that i am trying to filter and the second one is the good signal to compare it to

100 E 50 O) 0 € Int" -50 1000 2000 3000 4000 5000 6000 7000 8000 Frequency (Hz) x 10 9 -5 O 10 -15 1000 2000 3000 4000 5000 6000 7000 8000 Frequency (Hz)

Explanation / Answer

In the question, it is mentioned that the most of audio energy is concentrated at lower frequency. You can plot the power spectral density Plot(10*log10(FFT(magnitude))) of the given sampled input. It will have power across the entire frequency spectrum, but should be concentrated primarily in the lower frequencies. Figure out a cut-off point that will preserve most of your "signal(audio signal)" but should also get rid of most of your noise.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.