Dynamic measurement of room impulse responses using a moving microphone.
Dynamic measurement of room impulse responses using a moving microphone.
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使用移动麦克风动态测量房间脉冲响应。
DOI：
10.1121/1.2766776
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Vetterli
中科院分区：
文献类型：
--
作者：
Thibaut Ajdler;L. Sbaiz;M. Vetterli
本文介绍了一种记录大量房间脉冲响应或头部相关传递函数的技术。该技术使用以恒定速度移动的麦克风。给定一个设置（例如，房间脉冲响应的长度），仔细选择记录参数（激励信号、移动速度）导致沿着轨迹沿着重构所有脉冲响应。在麦克风沿着圆移动的情况下，最大角速度作为脉冲响应的长度、其最大时间频率、声音传播速度和圆的半径的函数给出。作为所提出的算法的结果，在44.1 kHz采样的头部相关的传递函数可以在不到1 s的时间内在所有角位置沿着水平面测量。所提出的理论相比，使用精密移动麦克风保持器的真实的系统实现。实际设置一起讨论其局限性。
A technique for the recording of large sets of room impulse responses or head-related transfer functions is presented. The technique uses a microphone moving with constant speed. Given a setup (e.g., length of the room impulse response), a careful choice of the recording parameters (excitation signal, speed of movement) leads to the reconstruction of all impulse responses along the trajectory. In the case of a moving microphone along a circle, the maximal angular speed is given as a function of the length of the impulse response, its maximal temporal frequency, the speed of sound propagation, and the radius of the circle. As a result of the presented algorithm, head-related transfer functions sampled at 44.1 kHz can be measured at all angular positions along the horizontal plane in less than 1 s. The presented theory is compared with a real system implementation using a precision moving microphone holder. The practical setup is discussed together with its limitations.