They're both based on the DCT. Mp3 (and AAC and Vorbis and more) use a modified DCT which uses block overlapping to mitigate aberrations on the block boundary.

They're both based on the DCT. Mp3 (and AAC and Vorbis and more) use a modified DCT which uses block overlapping to mitigate aberrations on the block boundary. Its no surprise it works, however you wouldn't necessarily get "as good" compression as you would from an optimized DCT coder (JPEG etc) based on the data duplication (2x for the overlapping blocks). See https://en.wikipedia.org/wiki/Modified_discrete_cosine_transform https://en.wikipedia.org/wiki/Modified_discrete_cosine_trans... https://en.wikipedia.org/wiki/Discrete_cosine_transform https://en.wikipedia.org/wiki/Discrete_cosine_transform