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mbsantiago avatar mbsantiago commented on May 30, 2024

Hi @vogelbam,

Thanks a lot for this issue!

I fully agree that this discrepancy can be confusing for the labeler. I think there are three potential sources for the problem:

  1. There could be a bug causing a misalignment between the placement of spectrogram images and the drawing of annotations in the frontend canvas.
  2. The STFT (Short-Time Fourier Transform) windows of the two audio segments don't align correctly. We may need to improve the selection of start and end times for the segments.
  3. When applying a denoising algorithm or normalizing amplitude values, the output can vary depending on the whole audio content of the segment. As a result, even overlapping audio segments may exhibit significantly different appearances.

Unfortunately, this issue is an unintended consequence of computing the spectrogram in chunks. However, chunk processing is necessary to prevent Whombat from crashing with large recordings or becoming too slow to navigate.

I'll dive deeper into this issue to explore potential solutions, but I'm open to any ideas or suggestions you may have.

Thanks for the issue!

Best regards,
Santiago

from whombat.

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