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- Modified_discrete_cosine_transform abstract "The modified discrete cosine transform (MDCT) is a lapped transform based on the type-IV discrete cosine transform (DCT-IV), with the additional property of being lapped: it is designed to be performed on consecutive blocks of a larger dataset,where subsequent blocks are overlapped so thatthe last half of one block coincides with the first half of the next block.This overlapping, in addition to the energy-compaction qualities of the DCT, makes the MDCT especially attractive for signal compression applications, since it helps to avoid artifacts stemming from the block boundaries. As a result of these advantages, the MDCT is employed in most modern lossy audio formats, including MP3, AC-3, Vorbis, Windows Media Audio, ATRAC, Cook, and AAC. The MDCT was proposed by Princen, Johnson, and Bradley in 1987, following earlier (1986) work by Princen and Bradley to develop the MDCT's underlying principle of time-domain aliasing cancellation (TDAC), described below. (There also exists an analogous transform, the MDST, based on the discrete sine transform, as well as other, rarely used, forms of the MDCT based on different types of DCT or DCT/DST combinations.)In MP3, the MDCT is not applied to the audio signal directly, but rather to the output of a 32-band polyphase quadrature filter (PQF) bank. The output of this MDCT is postprocessed by an alias reduction formula to reduce the typical aliasing of the PQF filter bank. Such a combination of a filter bank with an MDCT is called a hybrid filter bank or a subband MDCT. AAC, on the other hand, normally uses a pure MDCT; only the (rarely used) MPEG-4 AAC-SSR variant (by Sony) uses a four-band PQF bank followed by an MDCT. Similar to MP3, ATRAC uses stacked quadrature mirror filters (QMF) followed by an MDCT.".
- Modified_discrete_cosine_transform wikiPageExternalLink AES-paper-vol.47.PDF.
- Modified_discrete_cosine_transform wikiPageID "231387".
- Modified_discrete_cosine_transform wikiPageRevisionID "593192055".
- Modified_discrete_cosine_transform hasPhotoCollection Modified_discrete_cosine_transform.
- Modified_discrete_cosine_transform subject Category:Discrete_transforms.
- Modified_discrete_cosine_transform subject Category:Fourier_analysis.
- Modified_discrete_cosine_transform comment "The modified discrete cosine transform (MDCT) is a lapped transform based on the type-IV discrete cosine transform (DCT-IV), with the additional property of being lapped: it is designed to be performed on consecutive blocks of a larger dataset,where subsequent blocks are overlapped so thatthe last half of one block coincides with the first half of the next block.This overlapping, in addition to the energy-compaction qualities of the DCT, makes the MDCT especially attractive for signal compression applications, since it helps to avoid artifacts stemming from the block boundaries. ".
- Modified_discrete_cosine_transform label "Modified discrete cosine transform".
- Modified_discrete_cosine_transform label "Modifizierte diskrete Kosinustransformation".
- Modified_discrete_cosine_transform label "Transformada de coseno discreta modificada".
- Modified_discrete_cosine_transform label "Zmodyfikowana dyskretna transformacja kosinusowa".
- Modified_discrete_cosine_transform label "Модифицированное дискретное косинус-преобразование".
- Modified_discrete_cosine_transform label "修正離散コサイン変換".
- Modified_discrete_cosine_transform label "改進的離散餘弦變換".
- Modified_discrete_cosine_transform sameAs Modifizierte_diskrete_Kosinustransformation.
- Modified_discrete_cosine_transform sameAs Transformada_de_coseno_discreta_modificada.
- Modified_discrete_cosine_transform sameAs 修正離散コサイン変換.
- Modified_discrete_cosine_transform sameAs 수정_이산_코사인_변환.
- Modified_discrete_cosine_transform sameAs Zmodyfikowana_dyskretna_transformacja_kosinusowa.
- Modified_discrete_cosine_transform sameAs m.01hnp3.
- Modified_discrete_cosine_transform sameAs Q1268231.
- Modified_discrete_cosine_transform sameAs Q1268231.
- Modified_discrete_cosine_transform wasDerivedFrom Modified_discrete_cosine_transform?oldid=593192055.
- Modified_discrete_cosine_transform isPrimaryTopicOf Modified_discrete_cosine_transform.