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首页> 外文会议>Instrumentation and Measurement Technology Conference (I2MTC), 2012 IEEE International >Geometric error estimation and compensation in compact spherical loudspeaker array calibration
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Geometric error estimation and compensation in compact spherical loudspeaker array calibration

机译：紧凑型球形扬声器阵列校准中的几何误差估计和补偿

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摘要

Compact spherical loudspeaker arrays are nowadays investigated as sources for directional measurements and audio playback. Their microphone-based calibration is not trivial as it requires an elaborate measurement setup of highly accurate geometry. This contribution shows how measurements of accurate geometric alignment were obtained to the authors' best knowledge, and systematically discusses how possible inaccuracies affect the resulting spherical harmonic radiation patterns. Eventually, a method is developed to estimate geometric errors from the measured responses. This geometry estimation is verified by tests with intentional errors. Finally, results are successfully employed to make calibration measurements more robust against geometric errors of the setup. This is done by both time realignment of the responses compensating for radial errors and the correction of the angles in the spherical harmonic transform.
机译：如今，紧凑型球形扬声器阵列已被用作定向测量和音频回放的来源。他们的基于麦克风的校准并非易事，因为它需要精心设计的高精度几何测量设置。这一贡献显示出如何根据作者的最佳知识获得精确的几何对准的测量结果，并系统地讨论了不精确度如何影响最终产生的球形谐波辐射图。最终，开发了一种从测量的响应中估计几何误差的方法。通过有意错误的测试验证了这种几何估计。最后，成功地采用结果来使校准测量对设置的几何误差更加鲁棒。这可以通过补偿径向误差的响应的时间重新对齐以及球谐变换中角度的校正来完成。

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