Quantifying Quality Degradation of the EVS Super-Wideband Speech Codec
Quantifying Quality Degradation of the EVS Super-Wideband Speech Codec
复制标题
量化 EVS 超宽带语音编解码器的质量下降
DOI：
10.1109/qomex.2018.8463425
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Stephane Ragor
中科院分区：
文献类型：
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作者：
Gabriel Mittag;Sebastian Möller;Vincent Barriac;Stephane Ragor
语音传输网络通常是在计算质量模型的帮助下规划的，该模型给出了用户将体验到的预期质量的估计。这些工具中最受欢迎的是E模型。当某些参数已知时，例如所应用的编解码器及其比特率，该模型能够预测通信系统的感知质量。到目前为止，E-模型仅适用于窄带电话（300-3400 Hz），也仅限于宽带电话（100-7000 Hz）。随着语音网络向超宽带电话（50-14000 Hz）的扩展，以及超宽带编解码器EVS向移动的网络和最先进的智能手机的引入，E模型的更新已经变得必要。为此，我们首先研究了超宽带的质量改进，结果从混合频带的单频测试，其中我们发现，质量提高了15%。然后，我们计算的EVS编解码器的损害因素，并分析其对数据包丢失的鲁棒性，通过使用听觉和仪器的方法。
Voice transmission networks are commonly planned with the help of computational quality models, which give an estimate of the expected quality that a user will experience. The most popular of these tools is the E-model. When certain parameters are known, such as the applied codec and its bitrate, the model is able to predict the perceived quality of a communication system. Up to now, the E-model is only available for narrowband telephony (300–3400 Hz) and limited also for wideband telephony (100–7000 Hz). With the extension of voice networks to super-wideband telephony (50–14000 Hz), and the introduction of the super-wideband codec EVS to mobile networks and state of the art smartphones, an update of the E-model has become necessary. To this end, we firstly examined the quality improvement of super-wideband over wideband with results from mixed-band listening-only tests, where we found that the quality is improved by 15%. Then, we calculated impairment factors for the EVS codec and analyzed its robustness towards packet loss, by using auditory and instrumental methods.