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The collected EEG and audio signals were transformed into spectrograms, allowing the data to be visualised.

One of the goals of the research team was to find a way to extract the concert's tremor signals from spectrograms.

Regarding the database of bird sounds, the AI works by turning the recording into a spectrogram or data waveform which it then tries to match against those already on file.

These spectrograms are then converted back into audio to train bird sound identifiers.

To identify a bird by sound, Merlin takes a user's recording and converts it into a spectrogram—a visualization of the volume, pitch and length of the bird's call.