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本文利用机电类比方法就录相机中阻尼轮对走带抖晃的影响问题进行了分析,推导出了阻尼轮在两种不同情况下的走带系统的传递函数(幅频特性),从而得出了只有当阻尼轮处在干扰源与检测点之间,以及干扰源频率高于某一数值时阻尼轮才能衰减于扰对走带抖晃的影响。此外,还实测了阻尼轮在HR-2650录相机中对音频抖晃的影响,并通过信号处理计算机进行分析,画出了在有阻尼轮和没有阻尼轮时音频抖晃信号的频谱图。
In this paper, we analyze the influence of the damper wheel on the jitter of the video tape recorder by using the mechanical and electrical analogy method, and deduce the transfer function (amplitude-frequency characteristic) of the transmission system of the damping wheel in two different situations. Only when the damping wheel is between the interference source and the detection point, and the interference source frequency is higher than a certain value, the damping wheel can attenuate to disturb the impact on the jitter. In addition, the impact of the damping wheel on the audio jitter in the HR-2650 camera was also measured and analyzed by a signal processing computer to plot the audio jitter signal with and without the damping wheel.