基于三元伪随机序列集的多声源房间脉冲响应测量方法*

在多输入多输出系统中,诸多情况下需并行测量任意输入输出之间的脉冲响应。虽然利用以Kasami序列集为代表的二元伪随机序列集良好的相关特性可以实现多声源并行测量,但是囿于其编解码信号相同且为二元信号的特点,使得其相关特性仍存在较大的可优化空间。该文提供了一种基于三元伪随机序列集的多声源房间脉冲响应测量方法,具有更好的相关特性,提高了测量准确度。仿真和实验验证了该测量方法的可行性和准确性。在封闭空间几何模型构建等领域中,可使用该方法提高测量效率并降低由于各通道不同步导致的误差。

A multi-source room impulse response measurement method based on a ternary pseudo-random sequence set

Impulse responses between an arbitrary source and receiver need to be measured simultaneously in many cases of multiple-input multiple-output systems. Represented by the sets of Kasami sequences, binary pseudo-random sequence sets with good correlation properties can be utilized for simultaneous measurements of multi-source systems. However, performance of the method is limited for the encoding and decoding processes are based on the same binary signal. Based on a ternary pseudo-random sequence set, this paper proposes a method for making acoustic measurements simultaneously for multiple sources. The method with better correlation properties improves accuracy of measurements. Both simulation and experimental results are presented, demonstrating the feasibility and fidelity of the proposed method. In many domains such as modelling of room geometry, the proposed method can be used to improve efficiency of measurements and to lower the synchronization error of multi-channels measurements.