用相位合成器提升车载语音反馈消除的稳定性与音质
A Phase Synthesizer for Decorrelation to Improve Acoustic Feedback Cancellation
- 设计相位合成器融合频移与相位调制，实现信号解相关
- 在车载语音场景中使系统更稳定，PESQ得分提升明显
- 适合语音通信、助听器等需抗反馈的实时系统
通信系统中如车载语音、公共广播或助听器，常面临声反馈问题。若不加干预，自适应滤波器在消除反馈路径的同时可能抑制有效语音信号。一种解决方案是使扬声器与麦克风信号去相关。本文提出统一框架下的相位合成器，结合频率偏移与相位调制，基于离散傅里叶变换（DFT）滤波组实现。同时，引入变延迟线技术，借鉴颤音与合唱效果。以车载语音通信为例，采用自适应频域卡尔曼滤波器验证，显著提升了系统稳定性与语音质量，以感知语音质量（PESQ）为指标进行评估。
原文摘要 · Abstract (English)
Undesired acoustic feedback is a known issue in communication systems, such as speech in-car communication, public address systems, or hearing aids. Without additional precautions, there is a high risk that the adaptive filter - intended to cancel the feedback path - also suppresses parts of the desired signal. One solution is to decorrelate the loudspeaker and microphone signals. In this work, we combine the two decorrelation approaches frequency shifting and phase modulation in a unified framework: a so-called \textit{phase synthesizer}, implemented in a discrete Fourier transform (DFT) filter bank. Furthermore, we extend the phase modulation technique using variable delay lines, as known from vibrato and chorus effects. We demonstrate the benefits of the proposed phase synthesizer using an example from speech in-car communication, employing an adaptive frequency-domain Kalman filter. Improvements in system stability, speech quality measured by perceptual evaluation of speech quality (PESQ) are presented.
Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品；中文卡片由大模型生成，请以原文为准。