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A hybrid MLS technique for room impulse response estimation

机译：用于房间脉冲响应估计的混合MLS技术

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摘要

The measurement of room impulse response (RIR) when there are high background noise levels frequently means one must deal with very low signal-to-noise ratios (SNR). If such is the case, the measurement might yield unreliable results, even when synchronous averaging techniques are used. Furthermore, if there are non-linearities in the apparatus or system time variances, the final SNR can be severely degraded. The test signals used in RIR measurement are often disturbed by non-stationary ambient noise components. A novel approach based on the energy analysis of ambient noise - both in the time and in frequency - was considered. A modified maximum length sequence (MLS) measurement technique, referred to herein as the hybrid MLS technique, was developed for use in room acoustics. The technique consists of reducing the noise energy of the captured sequences before applying the averaging technique in order to improve the overall SNRs and frequency response accuracy. Experiments were conducted under real conditions with different types of underlying ambient noises. Results are shown and discussed. Advantages and disadvantages of the hybrid MLS technique over standard MLS technique are evaluated and discussed. Our findings show that the new technique leads to a significant increase in the overall SNR.
机译：当背景噪声水平很高时，对房间脉冲响应（RIR）的测量意味着必须处理非常低的信噪比（SNR）。在这种情况下，即使使用同步平均技术，该测量也可能会得出不可靠的结果。此外，如果设备或系统时间存在非线性，最终SNR可能会严重下降。 RIR测量中使用的测试信号通常会受到不稳定的环境噪声成分的干扰。考虑了一种基于环境噪声能量分析的新颖方法，包括时间和频率。已开发出一种改进的最大长度序列（MLS）测量技术，在本文中称为混合MLS技术，用于室内声学。该技术包括在应用平均技术之前降低捕获序列的噪声能量，以提高整体SNR和频率响应精度。实验是在实际条件下使用不同类型的潜在环境噪声进行的。结果被显示和讨论。评估和讨论了混合MLS技术相对于标准MLS技术的优缺点。我们的发现表明，新技术导致整体SNR的显着提高。

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