A time-warped MDCT approach to speech transform coding
Edler B, Disch S, Bayer S, Fuchs G, Geiger R (2009)
Publication Type: Conference contribution
Publication year: 2009
Publisher: 126th AES Convention
Edited Volumes: A time-warped MDCT approach to speech transform coding
City/Town: Munich, Germany
Book Volume: 2
Pages Range: 588-595
Conference Proceedings Title: 126th AES Convention
ISBN: 9781615671663
Abstract
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.
Authors with CRIS profile
Bernd Edler
Lehrstuhl für Audiosignalanalyse (AudioLabs) (Stiftungslehrstuhl)
Sascha Disch
International Audio Laboratories Erlangen (AudioLabs)
Stefan Bayer
International Audio Laboratories Erlangen (AudioLabs)
Guillaume Fuchs
International Audio Laboratories Erlangen (AudioLabs)
Involved external institutions
Germany (DE)How to cite
APA:
Edler, B., Disch, S., Bayer, S., Fuchs, G., & Geiger, R. (2009). A time-warped MDCT approach to speech transform coding. In 126th AES Convention (pp. 588-595). Munich, Germany: 126th AES Convention.
MLA:
Edler, Bernd, et al. "A time-warped MDCT approach to speech transform coding." Proceedings of the 126th AES Convention Munich, Germany: 126th AES Convention, 2009. 588-595.
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