In signal processing, a lapped transform is a type of linear discrete block transformation where the basis functions of the transformation overlap the block boundaries, yet the number of coefficients overall resulting from a series of overlapping block transforms remains the same as if a non-overlapping block transform had been used.
The best known example is the modified discrete cosine transform used in the MP3, Vorbis, AAC, and Opus audio codecs.
[5] Although the best-known application of lapped transforms has been for audio coding, they have also been used for video and image coding and various other applications.
More recently, a form of lapped transform has also been used in the development of the Daala video coding format.
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