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Getting data from the real world always results in noise and artefacts etc. If you've done any kind of work with data, a large part is preprocessing. MP3 seems
by Gravityloss 5y ago
Getting data from the real world always results in noise and artefacts etc. If you've done any kind of work with data, a large part is preprocessing. MP3 seems like a very minor source of problems compared to the potential others. Road noise, other birds, lorries backing up, people talking, mislabeling etc.
- TonyTrapp 5y agoThe difference however is that formats like MP3 work on the principle of psycho-acoustics, which means they modify the original audio in a way that is meant to be indistinguishable by human hearing, but it could very well cause a difference in the spectrum in places where it matters for the analysis (it can add and remove frequencies).
- willis936 5y agoThe compression is not wholesale adding or removing frequencies, it is selectively lowering the magnitude and SNR. Overall, the RMSE of 320 kbps mp3 against lossless of many common and simple waveforms is very low. Certainly it is acceptable for something like birdsong measurement.
- Gravityloss 5y agoThat's a great point, hadn't considered that. You changed my opinion.