A comparison of different loudspeaker models to empirically estimated non-linearities
A comparison of different loudspeaker models to empirically estimated non-linearities
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不同扬声器模型与经验估计非线性的比较
DOI：
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发表时间：
2014
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通讯作者：
Ludovick Lepauloux
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作者：
Leela K. Gudupudi;C. Beaugeant;N. Evans;M. M. Idrissa;Ludovick Lepauloux
本文对标量对角线(SD)Volterra级数建模非线性扬声器失真的适用性进行了探讨和质疑。将这种在非线性声学回波抵消(NAEC)研究中流行的方法与非标量对角线(NSD)模型进行了比较。新模型是根据经验估计的，但基于非线性卷积的理论基础。使用常见的真实语音测试信号，通过将每个模型合成的扬声器输出与在受控条件下测量的实际扬声器输出进行比较，客观地评估它们。结果表明，用NSD模型估计的非线性失真更好地反映了实际测量结果。我们还表明，使用SD扬声器模型进行的NAEC实验有可能过度夸大性能，而使用NSD模型进行的NAEC实验更好地反映了实际性能。
This paper investigates and questions the suitability of modelling non-linear loudspeaker distortion with scalar diagonal (SD) Volterra series. This approach, popular in studies of non-linear acoustic echo cancellation (NAEC), is compared to an alternative non-scalar diagonal (NSD) model. The new model is estimated empirically but based on the theoretical underpinnings of non-linear convolution. Using common, real-speech test signals, the loudspeaker outputs synthesised by each model are evaluated objectively through their comparison to real loudspeaker outputs measured in controlled conditions. Results show that non-linear distortion estimated with the NSD model better reflects that measured empirically. We also show that NAEC experiments conducted with SD loudspeaker models have the potential to over-exaggerate performance, whereas those conducted with an NSD model better reflect practical performance.