IEICE Transactions on Information and Systems
Online ISSN : 1745-1361
Print ISSN : 0916-8532
Regular Section
Adaptive Spectral Masking of AVQ Coding and Sparseness Detection for ITU-T G.711.1 Annex D and G.722 Annex B Standards
Masahiro FUKUIShigeaki SASAKIYusuke HIWASAKIKimitaka TSUTSUMISachiko KURIHARAHitoshi OHMUROYoichi HANEDA
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2014 Volume E97.D Issue 5 Pages 1264-1272

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Abstract

We proposes a new adaptive spectral masking method of algebraic vector quantization (AVQ) for non-sparse signals in the modified discreet cosine transform (MDCT) domain. This paper also proposes switching the adaptive spectral masking on and off depending on whether or not the target signal is non-sparse. The switching decision is based on the results of MDCT-domain sparseness analysis. When the target signal is categorized as non-sparse, the masking level of the target MDCT coefficients is adaptively controlled using spectral envelope information. The performance of the proposed method, as a part of ITU-T G.711.1 Annex D, is evaluated in comparison with conventional AVQ. Subjective listening test results showed that the proposed method improves sound quality by more than 0.1 points on a five-point scale on average for speech, music, and mixed content, which indicates significant improvement.

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© 2014 The Institute of Electronics, Information and Communication Engineers
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