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In mobile audio device applications, there is sometimes the need to include processing that can change the pitch or tempo of the sound. This additional signal processing can produce a power load on the batteries, which could be minimized if the decoder stage was combined with the pitch-time shift operation. The authors propose a modified AAC (advanced audio coding) decoder structure that can also change the pitch and tempo of an audio signal. To take advantage of the combination, the algorithm includes a preprocessing block before the IMDCT (inverse modified discrete cosine transform) block and a postprocessing block after the overlap and add block. Test results show that the algorithm produces quality results while reducing the computational load to 64% of the separate algorithms.
Author (s): Chi, Hua Jun; Kim, Tae Hoon; Park, Ju Sung
Affiliation:
Department of Electronic Engineering, Busan National University, Busan, Korea
(See document for exact affiliation information.)
Publication Date:
2014-03-06
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Permalink: https://aes2.org/publications/elibrary-page/?id=17127
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Chi, Hua Jun; Kim, Tae Hoon; Park, Ju Sung; 2014; Frequency Scale Translation in the MDCT Domain for AAC Decoder Algorithm [PDF]; Department of Electronic Engineering, Busan National University, Busan, Korea; Paper ; Available from: https://aes2.org/publications/elibrary-page/?id=17127
Chi, Hua Jun; Kim, Tae Hoon; Park, Ju Sung; Frequency Scale Translation in the MDCT Domain for AAC Decoder Algorithm [PDF]; Department of Electronic Engineering, Busan National University, Busan, Korea; Paper ; 2014 Available: https://aes2.org/publications/elibrary-page/?id=17127
@article{chi2014frequency,
author={chi hua jun and kim tae hoon and park ju sung},
journal={journal of the audio engineering society},
title={frequency scale translation in the mdct domain for aac decoder algorithm},
year={2014},
volume={62},
issue={3},
pages={118-126},
month={march},}