基于数字信号处理的声音控制开关(VOX)算法研究

基于数字谱分析的声控开关VOX(Voice—Operated Transmit)新算法首先利用功率谱二次处理结果进行处理，提取出语音波形的包络，然后对所得包络进行阚值处理、限幅放大，最后得到VOX函数。该算法具有简单、实用、对噪声的鲁棒性也较好，而且易于用数字信号处理实现，在某种程度上克服了传统VOX算法的结构复杂、参数难调、易受环境噪声影响等局限。理论分析和仿真结果表明，该算法不仅能较为准确的提取出语音波形的包络，而且能在较低的信噪比条件下工作。

Study on A Voice-Operated Transmit(VOX) Algorithm Based on Digital Signal Processing

This paper presents a new Voiced-Operated Transmit (VOX) algorithm based on digital spectral analysis, which uses the power spectrum reprocessing results of signal to extract envelope of the voice waveform, and uses a threshold to get the VOX function in the end. It features simple, practical, unaffected by ambient noise, and easy to realize by digital signal processing. The algorithms overcome the shortcomings (such as complicated, not easy to adjust the parameters, and tending to be affected by noise) of the existing algorithms. The computer simulation results show that this algorithm works well for input signals with lower SNR.