采用混合ACELP/TCX技术的16/24/32 kbit/s宽带语音和音频编解码器

B. Bessette, R. Salami, C. Laflamme, R. Lefebvre
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引用次数: 29

摘要

提出了一种用于语音和音乐信号16、24和32 kbit/s编码的ACELP/TCX混合算法。该算法在代数编码激励线性预测(ACELP)和变换编码激励(TCX)模式之间以20ms帧为基础进行切换。在20ms帧上应用TCX提高了音乐信号的质量。特别注意减轻两种模式之间的切换工件,从而实现透明的切换过程。主观测试结果表明,对于语音信号,在16、24、32 kbit/s下的性能与G.722在48、56、64 kbit/s下的性能相当。对于音乐信号,24 kbit/s的质量相当于56 kbit/s的G.722。然而,在16 kbit/s时,音乐的质量略低于48 kbit/s时的G.722。
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A wideband speech and audio codec at 16/24/32 kbit/s using hybrid ACELP/TCX techniques
A hybrid ACELP/TCX algorithm for coding speech and music signals at 16, 24, and 32 kbit/s is presented. The algorithm switches between algebraic code excited linear prediction (ACELP) and transform coded excitation (TCX) modes on a 20-ms frame basis. Applying TCX on 20 ms frames improved the quality for music signals. Special care was taken to alleviate the switching artifacts between the two modes resulting in a transparent switching process. Subjective test results showed that for speech signals, the performance at 16, 24, and 32 kbit/s, is equivalent to G.722 at 48, 56, and 64 kbit/s, respectively. For music signals, the quality at 24 kbit/s was found equivalent to G.722 at 56 kbit/s. However, at 16 kbit/s, the quality for music was slightly lower than G.722 at 48 kbit/s.
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