EXTRACTING TONGUES FROM MOVING HEADS
EXTRACTING TONGUES FROM MOVING HEADS
复制标题
从摇头头上拔出舌头
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
H. Tillmann
中科院分区：
文献类型：
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作者：
A. Zierdt;P. Hoole;M. Honda;T. Kaburagi;H. Tillmann
尽管现有的电磁正中矢状关节造影系统提供了关于语音运动学的宝贵信息，但它们不适合无误差地监测舌头从中线的实质性侧向偏离。由于他们需要固定的头部位置，他们也限制了受试者的运动自由，从而可能损害他们说话的自然性。因此，我们开始在IPSK开发一种新的电磁关节造影系统，该系统能够在球形区域内采集数据，而没有进一步的限制。新的3-D-EMA系统基于6个发射器线圈的球形放置，但与Carstens AG 100系统使用相同的接收器线圈。我们显著减少了模拟元件的数量，并构建了一个数字功能的设备。在过去的几个月里，我们进行了几次三维测量，以估计新设备的测量精度。我们获得了优于1毫米的空间分辨率和旋转检测约。1度精度。我们还能够验证新设备的磁场强度在测量区域中心约为2 μT，这与以前的磁场强度模型计算相当。我们提出了第一个3-D测量数据收集的新的3-D-EMA系统的原型上的人类受试者。为了补偿测量过程中受试者头部的运动，并将测量数据转换到颅骨固定坐标系中，必须将参考线圈放置在受试者头部上，并且必须使用额外的算法从传感器的运动中减去头部运动。虽然我们不得不处理一些技术问题所造成的初步部分，我们的原型，收集到的数据表明，新的3-D系统是能够获得多维数据的语音运动。特别是有限的测量频率的原型（25赫兹），使我们无法收集更多的articulographic重要的数据，因为只有几个测量点，每次发言，很难分析语音运动的轨迹。尽管如此，即使是这个原型也显示出了良好的前景，一套新的硬件组件目前正在组装中。在不久的将来，我们将专注于校准程序，并在增加通道数量的情况下，以足够的精度补偿测量期间的头部运动，以获得更多的语音相关数据。
Although existing electromagnetic mid-sagittal articulography Systems have provided invaluable information on speech kinematics, they are not suited to monitor substantial lateral deviations of the tongue from the midline without error. Due to their need for a fixed head-position they also restrict the subjects’ freedom of movement and thus potentially compromise the naturalness of their speech. Accordingly we started the development of a new electromagnetic articulography system at the IPSK, which is able to acquire data within a spherical area without further restrictions. The new 3-D-EMA system is based on a spherical placement of 6 transmitter coils but operates with the same receiver coils as the Carstens AG100 system. We significantly reduced the number of analog components and built a digital-featured device. During the last couple of months we did several 3-DMeasurements to estimate the measurement accuracy of the new device. We obtained a spatial resolution better than 1 mm and a rotation detection with approx. 1 degree accuracy. We were also able to verify that the magnetic field strength of the new device is about 2 μT at the center of the measurement area which is comparable to former model calculations of magnetic field strength. We present first 3-D measurement data on a human subject collected with a prototype of the new 3-D-EMA system. To compensate movements of the subjects head during the measurement and to transform the measured data into a skull-fixed coordinate system, reference coils must be placed on the subjects head and an extra algorithm has to subtract head-movements from the movements of the sensors. Although we had to deal with some technical problems caused by preliminary parts of our prototype, the data collected to date shows that the new 3-D system is capable to aquire multidimensional data of speech movements. Especially the limited measurement frequency of the prototype (25 Hz) prevented us from collecting more articulographic significant data, since with only a few measured points per utterance it is difficult to analyze trajectories of speech movement. Still, even this prototype shows promising prospects and a new set of hardware components is currently being assembled. In the near future we will focus on the calibration procedure and – with increased number of channels – on the compensation of head movements during the measurements with sufficient accuracy to obtain more phonetically relevant data.