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**New fast computational structures for an efficient implementation of the forward/backward MDCT in MP3 audio coding standard.**
*(English)*
Zbl 1178.94054

Summary: New fast computational structures identical for an efficient implementation of both the forward and backward modified discrete cosine transform (MDCT) in the MPEG-1/2 Layer III (MP3) audio coding standard are described. They are based on a new proposed universal fast rotation-based MDCT computational structure [the author, Signal Process. 89, No. 11, 2213–2232 (2009; Zbl 1169.94305)]. New fast computational structures are derived in the form of a linear code and they are particularly suitable for high-performance programmable DSP processors. For the short audio block, it is shown that our efficient MDCT implementation in MP3 can be modified to achieve the same minimal multiplicative complexity compared to that of X. Dai and M. D. Wagh [in: Proceedings of the IEEE Symposium on Application Specific Processors, SASP ’2008, Anaheim, CA, June 2008, 121–125 (2008)].

### MSC:

94A12 | Signal theory (characterization, reconstruction, filtering, etc.) |

### Keywords:

modified discrete cosine transform; modulated lapped transform; fast computational structure; MP3 audio coding### Citations:

Zbl 1169.94305
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\textit{V. Britanak}, Signal Process. 90, No. 2, 536--547 (2010; Zbl 1178.94054)

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### References:

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