子带并联级联Volterra滤波器实现非线性声回波消除

Hideyuki Furuhashi, Y. Kajikawa, Y. Nomura
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引用次数: 2

摘要

本文提出了一种低复杂度的非线性声回波抵消实现方法。一般认为免提通信系统的声回波路径是线性系统。然而,由于低成本音频设备的非线性失真影响很大,现代手机的声回波路径具有非线性。为了解决这一问题,提出了包括线性化系统在内的非线性回波消除方法。然而,输入信号与二阶Volterra核之间的卷积存在计算复杂度巨大的问题。因此,我们提出了一种二阶Volterra核的子带并行级联非线性回波抵消实现,并通过仿真结果验证了其有效性。仿真结果表明,该方法在保持回波回波损耗增强效果的同时,大大降低了计算复杂度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Realization of Nonlinear Acoustic Echo Cancellation by Subband Parallel Cascade Volterra Filter
In this paper, we propose low complexity realization of nonlinear acoustic echo cancellation. Generally, it is assumed that the acoustic echo path in hands free telecommunication systems is a linear system. However, the acoustic echo path in modern cellular phones has nonlinearity because the influence of nonlinear distortions of the low cost audio equipment is very large. In order to solve this problem, the nonlinear echo cancellation that includes the linearization system has been proposed. However, there is a problem of having huge computational complexity for convolution between the input signal and the 2nd-order Volterra kernel. Therefore, we propose a nonlinear echo cancellation which consists of subband parallel cascade realization of the 2nd-order Volterra kernel, and examine the validity through simulation results. Simulation results demonstrate that the proposed realization can substantially reduce the computational complexity while maintaining the same echo return loss enhancement as the conventional one.
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