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Akihiko Sugiyama
Researcher at NEC
Publications - 216
Citations - 2467
Akihiko Sugiyama is an academic researcher from NEC. The author has contributed to research in topics: Signal & Adaptive filter. The author has an hindex of 26, co-authored 211 publications receiving 2429 citations. Previous affiliations of Akihiko Sugiyama include Tokyo Metropolitan University.
Papers
More filters
Proceedings ArticleDOI
A generalized proportionate variable step-size algorithm for fast changing acoustic environments
TL;DR: Simulation results in the context of echo cancellation in artificial and real environments demonstrate that this step-size control combined with the affine projection algorithm (APA) reduces the echo by up to 5 dB compared to the standard APA.
Proceedings ArticleDOI
Adaptive transform coding with an adaptive block size (ATC-ABS)
TL;DR: Computer simulation results show that average segmental SNR by the feedback approach is improved by as much as 4.8 dB over the conventional fixed-block-size ATC, while the feedforward approach is successful in pre-echo suppression to a satisfactory level.
Journal ArticleDOI
Noise suppression with high speech quality based on weighted noise estimation and MMSE STSA
TL;DR: In this article, the authors proposed a high speech quality noise suppression method based on weighted noise estimation and MMSE STSA, which continuously updates the noise estimate, using weighted noisy speech according to the estimated speech-to-noise ratio.
Journal Article
Noise Suppression with High Speech Quality Based on Weighted Noise Estimation and MMSE STSA
TL;DR: The improved version, which was developed on the basis of the proposed noise suppressor, satisfies all 3GPP minimum requirements for speech quality and has been installed in a commercially available model.
Journal ArticleDOI
A 128 Kb/s Hi-Fi audio codec based on adaptive transform coding with adaptive block size MDCT
TL;DR: A Hi-Fi audio codec with an improved adaptive transform coding (ATC) algorithm is presented using digital signal processors (DSPs) and subjective tests show that the coding quality is comparable to that of compact disc signals.