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	音频编码中非均匀滤波器组的构造
	阎建新 ; 窦维蓓 ; 董在望 ; YAN Jianxin ; DOU Weibei ; DONG Zaiwang
	2010-06-09 ; 2010-06-09
关键词	语音信号处理 音频编码 时频分析 扩展重叠变换 非均匀滤波器组 speech signal processing audio encoding time- frequency analysis extended lapped transforms nonuniform filter banks TN912.3
其他题名	Nonuniform filter banks for audio encoding
中文摘要	为了更好地满足音频编码中时频映射的技术要求,基于频变调制重叠变换(FV-MLT),推导出更具一般性的频变扩展重叠变换(FV-ELT),从而构造了一类具有可变时频分辨率特性的滤波器组。它既可为瞬态音频信号提供灵活的时频映射,又保证稳态信号时有很高的频率分辨率。理论分析结果表明FV-ELT比MLT和FV-MLT有更高的变换增益,以8子带为例的仿真结果,也进一步验证FV-ELT提供了更好的时频分析特性。因此FV-ELT是非常适于音频编码时频分析的一类滤波器组,能够有效提高编码效率。; Time-frequency mapping (TFM) of audio coding is improved by generalized FV-ELT (frequency-varying extended lapped transforms) derived based on FV-MLT (frequency-varying modulated lapped transforms). A class of nonuniform filter banks was constructed using FV-ELT with a variable time-frequency resolution. The filters provide more flexible TFM when applied to transient signals, while guaranteeing a higher frequency resolution for stationary signals. Theoretical analysis shows that FV-ELT give a higher transform gain than FV-MLT or MLT. Simulation results for an example with 8 nonuniform subbands shows that FV-ELT are superior to FV-MLT for some frequency properties. Thus, FV-ELT are a class of TFM filter banks for audio encoding with a higher encoding efficiency.
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/53552]
专题	清华大学
推荐引用方式 GB/T 7714	阎建新,窦维蓓,董在望,等. 音频编码中非均匀滤波器组的构造[J],2010, 2010.
APA	阎建新,窦维蓓,董在望,YAN Jianxin,DOU Weibei,&DONG Zaiwang.(2010).音频编码中非均匀滤波器组的构造..
MLA	阎建新,et al."音频编码中非均匀滤波器组的构造".(2010).

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