A Time-Warped MDCT Approach to Speech Transform Coding

Edler B, Disch S, Bayer S, Fuchs G, Geiger R. A Time-Warped MDCT Approach to Speech Transform Coding. In: AES Convention 126. Audio Engineering Society; 2009. Paper 7710. Available from: https://aes.org/publications/elibrary-page/?id=14906

@inproceedings{Edler2009_14906,
  author = {Edler, Bernd and Disch, Sascha and Bayer, Stefan and Fuchs, Guillaume and Geiger, Ralf},
  title = {{A Time-Warped MDCT Approach to Speech Transform Coding}},
  booktitle = {AES Convention 126},
  note = {Paper 7710},
  year = {2009},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=14906}
}

TY  - CPAPER
TI  - A Time-Warped MDCT Approach to Speech Transform Coding
AU  - Edler, Bernd
AU  - Disch, Sascha
AU  - Bayer, Stefan
AU  - Fuchs, Guillaume
AU  - Geiger, Ralf
T2  - AES Convention 126
M1  - Paper 7710
PY  - 2009
DA  - 2009/05/06
UR  - https://aes.org/publications/elibrary-page/?id=14906
PB  - Audio Engineering Society
LA  - en
AB  - The modified discrete cosine transform (MDCT) is often used for audio coding due to its critical sampling property and good energy compaction, especially for harmonic tones with constant fundamental frequencies (pitch). However, in voiced human speech the pitch is time-varying and thus the energy is spread over several transform coefficients, leading to a reduction of coding efficiency. The approach presented herein compensates for pitch variation in each MDCT block by application of time-variant re-sampling. A dedicated signal adaptive transform window computation ensures the preservation of the time domain aliasing cancelation (TDAC) property. Re-sampling can be designed such that the duration of the processed blocks is not altered, facilitating the replacement of the conventional MDCT in existing audio coders.
ER  -