A Wideband Automotive Hands-Free System for Mobile HD Voice Services
A Wideband Automotive Hands-Free System for Mobile HD Voice Services
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DOI：
10.1007/978-1-4614-9120-0_6
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Marc-André Jung;T. Fingscheidt
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文献类型：
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作者：
Marc-André Jung;T. Fingscheidt
支持50至7000赫兹语音带宽的宽带移动电话得到越来越多的应用。这些所谓的移动高清语音服务最终进入了汽车应用领域。在本章中，我们提出了一种用于汽车电话应用的宽带免提系统，该系统具有同步适应的声学回声消除器和后滤波器。它以频域自适应滤波方法和卡尔曼滤波理论为基础，利用广义维纳后置滤波器对残余回波进行抑制和降噪。为了在时变回波路径下提供高收敛率，具有非常鲁棒双通性能的回波消除器由快速收敛的阴影滤波器支持，从而实现良好的跟踪性能。采用抽取方法在不损失质量的情况下降低算法延迟和计算复杂度。车内脉冲响应的实验结果表明，该方法具有良好的回波消除能力，收敛时间快，具有出色的全双工性能，同时在收敛状态下仍然保持语音分量几乎不受影响。
Wideband mobile telephony supporting a speech bandwidth from 50 to 7,000 Hz gets more and more employed. These so-called mobile HD Voice services consequently find their way into automobile applications. In this chapter we present a wideband hands-free system for automotive telephony applications with a synchronously adapted acoustic echo canceller and postfilter. It is based on a frequency domain adaptive filter approach and Kalman filter theory and makes use of a generalized Wiener postfilter for residual echo suppression and noise reduction in a consistent way. To provide a high convergence rate in case of time-variant echo paths, the echo canceller with very robust double-talk performance is supported by a fast converging shadow filter, which allows for a good tracking performance. A decimation approach is used to decrease algorithmic delay and computational complexity without loss of quality. Experimental results with car cabin impulse responses show good echo cancellation capabilities with fast convergence times along with extraordinary full-duplex performance while still keeping an almost untouched speech component in the converged state.