LP/WLP Hybrid Scheme for Quality Improvement of TCX Coders Operating at Low Bit Rates

被引：0
|
作者：
Lee, Tung-chin [1 ]
Park, Young-cheol [2 ]
Youn, Dae-hee [1 ]
机构：
[1] Yonsei Univ, Seoul 120749, South Korea
[2] Yonsei Univ, Wonju, Kangwon, South Korea
来源：
IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS | 2012年 / E95D卷 / 07期
关键词：
warped linear prediction (WLP); linear prediction; audio coding; TCX; low bit rate;
D O I：
10.1587/transinf.E95.D.2017
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this paper, we propose a switchable linear prediction (LP)/warped linear prediction (WLP) hybrid scheme for the transform coded excitation (TCX) coder, which is adopted as a core codec in AMR-WB+ and USAC. The proposed algorithm selects either an LP or WLP filter on a per-frame basis. To provide a smooth transitions between LP and WLP frames, a window switching scheme is developed using sine and rectangular windows. In addition, a Gaussian Mixture Model (GMM)-based classification module is used to determine the prediction mode. Through a subjective listening test it was confirmed that the proposed LP/WLP switching scheme offers improved sound quality.
引用
收藏
页码：2017 / 2020
页数：4
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