语音编码器DTX操作的鲁棒语音活动检测

1999 IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria (Cat. No.99EX351) Pub Date : 1999-06-20 DOI:10.1109/SCFT.1999.781483

F. Basbug, S. Nandkumar, K. Swaminathan

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引用次数: 6

摘要

短期语音帧的语音活动鲁棒检测对于is -641等声码器的不连续传输(DTX)操作模式至关重要。为此，选择了is -641编码器的参考VAD，它基于GSM-EFR(增强全速率)VAD。我们通过开发一个综合评估程序表明，参考VAD对语音水平变化很敏感。例如，当语音水平高于或低于标称水平10 dB时，被错误地分类为活动的帧显著增加。我们提出了一种基于自动增益控制的方案来降低电平灵敏度。客观性能测量证实了我们提出的VAD的鲁棒性。

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Robust voice activity detection for DTX operation of speech coders

Robust detection of voice activity for short-term speech frames is essential for discontinuous transmission (DTX) mode of operation of vocoders such as IS-641. A reference VAD for the IS-641 coder has been chosen for such a purpose and is based on the GSM-EFR (enhance full rate) VAD. We show by developing a comprehensive evaluation procedure that the reference VAD is sensitive to speech level variations. For example, a significant increase is seen in frames falsely classified as active at speech levels of 10 dB above or below nominal level. We propose a solution based on automatic gain control to reduce level sensitivity. Objective performance measures confirm the robustness of our proposed VAD.

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来源期刊

1999 IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria (Cat. No.99EX351)

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