What if i apply high pass & low pass filter to audio file?

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Rajith 2014-9-3

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评论： Star Strider 2014-9-3

Hi,

I want an exaplantion about what if i apply low pass butterworth 5th order filter to an audio file? What happens if I apply high pass butterworth 5th order filter to an audio file? And lastly what happens if I apply white noise to an audio file?

I don't want the code. I want to understand the concept first so can anyone please send me good explaination about this?

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Answer 1

Star Strider 2014-9-3

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A low-pass filter would delete the frequencies above the filter cutoff.

A high-pass filter would delete the frequencies below the filter cutoff.

(You can cascade the filters if you wanted to do both, but it would be more efficient to use a bandpass filter in that instance.)

Adding white noise would add noise to the signal evenly across the spectrum.

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Rajith 2014-9-3

Ya you are absoultely correct. I want to extract MFCC and PLP features for the audio file before extracting I have beed told to apply low pass, high pass filter and white noise. Which I don't get the extact meaning?

Star Strider 2014-9-3

I’m not familiar with MFCC and PLP features, but Dan Ellis at Columbia (NYC, U.S.) obviously is. His page PLP and RASTA (and MFCC, and inversion) in Matlab using melfcc.m and invmelfcc.m seems a good place to start. (Please cite his page if you use his routines.)

It is probably best for you to search the Internet to find information most relevant to your particular applications. Feature extraction from audio signals is not an area of my expertise, but it looks interesting.

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