Do I need to remove audio DC offset with MFCC manually or not?

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#1

I have audio samples with varying DC offset. Do I need to manually remove the DC offset, or does the MFCC or Edge Impulse handle it automatically?

I tried to compare the same audio sample:

  • with DC offset: MFCC image looks “cooler”
  • without DC offset: MFCC image looks “warmer”

This suggests I must remove it manually, but I’m not sure…

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#2

I would think the DC would only show up in the lowest bin. It may be that the lowest bin is setting the max intensity for the graph.

You should be fine to leave the dc! It shouldn’t impact the other bins

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