A spectrogram is a three-dimensional picture of sound – any sound. The three dimensions are time, frequency, and amplitude. Spectrograms usually look abstract, like successions of clumsy paint strokes or stills from Tron. They’re useful for sound engineers, but not all that good to look at. However, some software can also conduct spectral analysis in reverse, translating images into sound. In this case, the images are clear and the audio typically abstract.
