MP3: Difference between revisions
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(Add to audio codecs category.) |
(Not a quadrature mirror filter) |
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* Patents: US5214678, US5323396, US5777992 | * Patents: US5214678, US5323396, US5777992 | ||
Lossy audio coding using a time-frequency transform consisting of a 32-subband | Lossy audio coding using a time-frequency transform consisting of a 32-subband polyphase quadrature filter followed by an 18-point MDCT on blocks of 576 samples. In addition, coded frames may be padded by 1 bit as necessary to maintain a strict CBR. This rather odd design was meant to provide backwards compatibility with the blocksize and bit rates of the existing MP2 format. Although it is less efficient than using a pure MDCT (eg AAC and Ogg Vorbis) MP3 has become a de facto standard since it was the first widely available format. | ||
[[Category:Audio Codecs]] | [[Category:Audio Codecs]] |
Revision as of 04:53, 21 January 2006
- Patents: US5214678, US5323396, US5777992
Lossy audio coding using a time-frequency transform consisting of a 32-subband polyphase quadrature filter followed by an 18-point MDCT on blocks of 576 samples. In addition, coded frames may be padded by 1 bit as necessary to maintain a strict CBR. This rather odd design was meant to provide backwards compatibility with the blocksize and bit rates of the existing MP2 format. Although it is less efficient than using a pure MDCT (eg AAC and Ogg Vorbis) MP3 has become a de facto standard since it was the first widely available format.