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WIP : Functions for data augmentation

This merge request adds functions to facilitate the following data-augmentation steps:

  • Scale frequency axis by some random factor close to 1
  • Scale time axis by some random factor close to 1
  • Enhance/reduce high frequencies relative to low frequencies (by multiplying the magnitude spectrogram by a frequency-dependent factor)
  • Add Gaussian noise
  • Use GANs (Generative Adversarial Networks) to generate new signals Here's a tutorial. And the paper.
  • Enhance signal magnitude relative to background (this may be a little tricky to implement, but we could probably come up with something...)

This merge request resolves Issue data_analytics_dal/packages/sound_classification#10.

Edited by Fabio Frazao