| 基于数字信号处理的嗓音控制开关(VOX)算法研究 |
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| 引用本文： | 张天骐,李伟,林孝康,刘林.基于数字信号处理的嗓音控制开关(VOX)算法研究[J].应用声学,2005,24(3):157-163. |
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| 作者姓名： | 张天骐 李伟 林孝康 刘林 |
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| 作者单位： | 清华大学深圳研究生院,深圳,518055 |
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| 摘 要： | 本文提出了一种基于数字谱分析的嗓音控制开关(VOX，Voice—Operated Transmit)的新算法，该算法简单、实用，在某种程度上克服了传统VOX算法的结构复杂、参数难调等局限，对噪声的鲁棒性也较好，而且易于用数字信号处理实现。首先利用信号功率谱二次处理，提取出语音的平均幅度包络，然后对所得包络进行阈值处理、限幅放大，最后就得到VOX函数。理论分析和计算机模拟结果表明，该算法不仅能较为准确地提取出语音波形的平均幅度包络，而且能工作在较低的信噪比条件下。
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| 关 键 词： | 数字信号处理 控制开关 算法研究 嗓音 Voice 信号功率谱 二次处理 阈值处理 模拟结果 语音波形 VOX 谱分析 新算法 鲁棒性 包络 计算机 信噪比 幅度 平均 提取 限幅 |
Study on a Voice-Operated Transmit (VOX) algorithm based on digital signal processing |
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| ZHANG Tian-Ji,LI Wei,LIN Xiao-Kang and LI Lin.Study on a Voice-Operated Transmit (VOX) algorithm based on digital signal processing[J].Applied Acoustics,2005,24(3):157-163. |
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| Authors: | ZHANG Tian-Ji LI Wei LIN Xiao-Kang and LI Lin |
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| Institution: | Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055;Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055;Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055;Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055 |
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| Abstract: | This paper presents a new Voiced-Operated Transmit (VOX) algorithm based on digital spectral analysis. It has the characteristics of being simple, easy to adjust the parameters, unaffected by the ambient noise, and easy to be realized by digital signal processing. The algorithms use the power spectrum reprocessing method to extract the averaged amplitude envelope of speech signal, and by the application of a threshold to get the VOX function. The results of computer simulation show that this algorithm can work well under the low signal to noise ratio condition. |
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| Keywords: | Voice-Operated Transmit (VOX) Power spectrum reprocessing Digital spectral analysis Averaged amplitude envelope of speech signal |
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