Multiple frequency audio signal communication as a mechanism for neurophysiology and video data synchronization.
Multiple frequency audio signal communication as a mechanism for neurophysiology and video data synchronization.
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DOI：
10.1016/j.jneumeth.2014.09.018
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发表时间：
2014-12-30
影响因子：
3
通讯作者：
Maurer, Andrew Porter
中科院分区：
文献类型：
--
作者：
Topper, Nicholas C.;Burke, Sara N.;Maurer, Andrew Porter
目前用于对齐神经生理学和视频数据的方法要么是预先打包的，需要额外购买软件套件，要么是使用具有固定脉冲宽度和频率的闪烁LED。这些方法缺乏用于适应的重要用户界面，成本高昂，或者存在两个数据流不一致的风险。通过产生嵌入了两个信息域的音频脉冲，即低频二进制计数信号和高随机变化频率，获得获得高精度行为和神经生理数据对准的经济有效的手段。这使得能够导出时间信息，同时在系统中保持足够的熵以用于算法对齐。使用本文描述的音频输入相关方法构造的样本到帧的索引使得视频和数据采集能够在精度的子帧级别上对齐。传统上，同步脉冲通过闪光二极管记录在屏幕上。摄像机的音频输入的较高采样率使得能够以更高的精度检测事件的定时。虽然在某些情况下，使用专用设备进行在线分析和同步可能是理想的情况，但本文提出的方法提供了一种可行的、低成本的替代方案，并提供了与定制离线分析工具接口的灵活性。此外，本文件中介绍的这种设置的构建和实现的简单性使其适用于需要视频记录的各种应用。
Current methods for aligning neurophysiology and video data are either prepackaged, requiring the additional purchase of a software suite, or use a blinking LED with a stationary pulse-width and frequency. These methods lack significant user interface for adaptation, are expensive, or risk a misalignment of the two data streams. A cost-effective means to obtain high-precision alignment of behavioral and neurophysiological data is obtained by generating an audio-pulse embedded with two domains of information, a low-frequency binary-counting signal and a high, randomly changing frequency. This enabled the derivation of temporal information while maintaining enough entropy in the system for algorithmic alignment. The sample to frame index constructed using the audio input correlation method described in this paper enables video and data acquisition to be aligned at a sub-frame level of precision. Traditionally, a synchrony pulse is recorded on-screen via a flashing diode. The higher sampling rate of the audio input of the camcorder enables the timing of an event to be detected with greater precision. While On-line analysis and synchronization using specialized equipment may be the ideal situation in some cases, the method presented in the current paper presents a viable, low cost alternative, and gives the flexibility to interface with custom off-line analysis tools. Moreover, the ease of constructing and implements this set-up presented in the current paper makes it applicable to a wide variety of applications that require video recording.
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