It is used in most digital media, including digital images (such as JPEG and HEIF), digital video (such as MPEG and H.26x), digital audio (such as Dolby Digital, MP3 and AAC), digital television (such as SDTV, HDTV and VOD), digital radio (such as AAC+ and DAB+), and speech coding (such as AAC-LD, Siren and Opus). The DCT, first proposed by Nasir Ahmed in 1972, is a widely used transformation technique in signal processing and data compression. ( July 2022)Ī discrete cosine transform ( DCT) expresses a finite sequence of data points in terms of a sum of cosine functions oscillating at different frequencies. Editors: please remove this warning only after the diffs listed ] have been checked for accuracy. Please see the cleanup page for more information. This article may misquote or misrepresent many of its sources.
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