"I wouldn't have guessed there was enough data left in the picture of the gramophone track to recreate audio from it." I'd bet it's almost the other way around

"I wouldn't have guessed there was enough data left in the picture of the gramophone track to recreate audio from it." I'd bet it's almost the other way around.. the information density would be so low because the information itself is relatively low resolution* that it makes the analysis that much easier. * "Resolution" in the detail sense of the word, not the visual.