不同标准的振铃波抗扰度试验信号波形定义、试验电压等级以及试验信号发生器技术指标等都存在一定的差异。
There are some differences in waveforms, test voltage levels and technical specifications of ring wave generator circuits, which have regulated by several immunity test standardization documents.
TBC的数字录音器开始录音，录音时间从电话振铃起到呼叫结束自动停止。
TBC's digital recorder will begin recording from the time the phone rings and stop automatically when the call is finished.
它即可用于参数和时滞未知的或慢时变的受控对象，又可用于逆不稳定过程，并能消除控制器的振铃现象，应用范围大为拓广。
It can be applied not only to plants with unknown or show time-varying parameters and delays, but also to unstable inverse processes.
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