ETRI-Knowledge Sharing Plaform

KOREAN
논문 검색
Type SCI
Year ~ Keyword

Detail

Conference Paper Hybrid Noise Shaping for Audio Coding Using Perfectly Overlapped Window
Cited 2 time in scopus Share share facebook twitter linkedin kakaostory
Authors
Byeongho Jo, Seungkwon Beack
Issue Date
2023-10
Citation
Workshop on Applications of Signal Processing to Audio and Acoustics (WASPAA) 2023, pp.1-5
Language
English
Type
Conference Paper
DOI
https://dx.doi.org/10.1109/WASPAA58266.2023.10248116
Abstract
In recent years, audio coding technology has been standardized based on several frameworks that incorporate linear predictive coding (LPC). However, coding the transient signal using frequency-domain LP residual signals remains a challenge. To address this, temporal noise shaping (TNS) can be adapted, although it cannot be effectively operated since the estimated temporal envelope in the modified discrete cosine transform (MDCT) domain is accompanied by the time-domain aliasing (TDA) terms. In this study, we propose the modulated complex lapped transform-based coding framework integrated with transform coded excitation (TCX) and complex LPC-based TNS (CTNS). Our approach uses a 50% overlap window and switching scheme for the CTNS to improve the coding efficiency. Additionally, an adaptive calculation of the target bits for the sub-bands using the frequency envelope information based on the quantized LPC coefficients is proposed. To minimize the quantization mismatch between both modes, an integrated quantization for real and complex values and a TDA augmentation method that compensates for the artificially generated TDA components during switching operations are proposed. The proposed coding framework shows a superior performance in both objective metrics and subjective listening tests, thereby demonstrating its low bit-rate audio coding.
KSP Keywords
Audio coding, Augmentation method, Coding efficiency, Complex values, Frequency domain(FD), LP Residual, Modified Discrete Cosine Transform(MDCT), Residual signal, Switching operation, Switching scheme, Temporal noise shaping