Cancel Microphone Noise w/ Lowpass Filter | Help Needed

In summary, the conversation is about cancelling microphone noise and using a lowpass filter, particularly the filter command with fir1. The speaker is struggling to understand how to customize the filter coefficients in order to effectively remove the noise in their recorded signal. They are seeking help and suggestions, and someone suggests trying a bandpass filter with low frequency at 300 Hz and high frequency at 4 kHz. The speaker is encouraged to read the help file to learn how to set the coefficients.
  • #1
blue_raver22
2,250
0
I need help in cancelling microphone noise... I am just not sure whether or not i should use a lowpass filter... can anyone give me help?

i want to use the filter command along with fir1... but i don't understand how to use them... i couldn't figure out how to customize the filter coefficients that would effectively remove the noise in our recorded signal... am i going in the right direction?

any hepl would be greatly appreciated... our thesis is in dire need of a digital filter... i know this is quite simple but the logic just simply doesn't want to see eye to eye with me...
 
Computer science news on Phys.org
  • #2
Maybe bandpass, the mic sometimes picks up low freq garbage like breath and/or wind. Try low freq about 300 hz and high at 4 khz. You will have to read the help file to set coef. Good luck.
 
  • #3



Hi there,

Cancelling microphone noise can definitely be a tricky task, but using a lowpass filter can certainly help with reducing unwanted noise. Here are some tips that may help with using the filter command and fir1:

1. Make sure you understand the basics of digital filters and how they work. This will give you a better understanding of what you need to do in order to effectively remove the noise.

2. Familiarize yourself with the filter command and its syntax. This will help you understand how to use it and what parameters you need to specify.

3. Look into different types of filters and their characteristics. For example, a Butterworth filter is often used for audio signals and has a smooth frequency response, while a Chebyshev filter has a steeper roll-off but may introduce some ripple in the passband.

4. Consider using a graphical user interface (GUI) tool to help with designing your filter. Many software programs have built-in filter design tools that allow you to visualize the frequency response and adjust parameters to achieve your desired result.

5. Check out online resources and tutorials that explain how to use the filter command and fir1 for noise cancellation. There are many helpful guides and videos available that can guide you through the process step by step.

I hope these tips help you in your quest to cancel microphone noise. Don't get discouraged, with some practice and research, you'll be able to successfully implement a lowpass filter to improve the quality of your recorded signal. Best of luck with your thesis!
 

What is a lowpass filter?

A lowpass filter is an electronic circuit that allows low frequency signals to pass through while blocking high frequency signals. It is commonly used to eliminate unwanted high frequency noise or interference in electronic devices.

How does a lowpass filter cancel microphone noise?

A lowpass filter can be used to eliminate high frequency noise that is picked up by a microphone. By setting the cut-off frequency of the filter below the frequency of the noise, the filter will block the noise while allowing the desired low frequency audio signals to pass through.

Can a lowpass filter be added to any microphone?

Yes, a lowpass filter can be added to any microphone as long as it has an electronic circuit that allows for modification. Some microphones may already have a built-in lowpass filter that can be adjusted.

Are there any downsides to using a lowpass filter on a microphone?

One potential downside is that a lowpass filter can also attenuate some of the desired low frequency audio signals. This may result in a loss of overall sound quality. Additionally, if the cut-off frequency is set too low, it may also cut off some of the desired audio signals.

Should I use a lowpass filter to cancel microphone noise?

It depends on the source of the noise and the desired audio quality. If the noise is primarily high frequency and the desired audio signals are primarily low frequency, then using a lowpass filter can be an effective solution. However, if the noise is not purely high frequency or the desired audio signals also contain high frequency components, then a different noise cancellation method may be more suitable.

Similar threads

Replies
9
Views
1K
  • Engineering and Comp Sci Homework Help
Replies
2
Views
817
  • Engineering and Comp Sci Homework Help
Replies
3
Views
1K
  • Electrical Engineering
Replies
6
Views
1K
  • Electrical Engineering
Replies
15
Views
3K
Replies
1
Views
676
Replies
11
Views
4K
  • Electrical Engineering
Replies
10
Views
2K
  • Electrical Engineering
Replies
3
Views
761
  • Electrical Engineering
Replies
1
Views
2K
Back
Top