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首页> 外文期刊>Proceedings of the IEE - Part B: Radio and Electronic Engineering >A servo system for digital data transmission
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A servo system for digital data transmission

机译：用于数字数据传输的伺服系统

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Certain special features must be taken into account in the design of a servo system which is to operate satisfactorily with digital data. In particular, the data are quantized in amplitude, thereby introducing non-linear effects; they constitute a series of samples instead of a continuous function, and there may be significant delays due to low-speed transmission circuits or digital equipment or both. All of these contribute in various ways towards reducing the stability of the system. The method of synthesis takes full account of the sampling and delay features and enables a degree of prediction to be incorporated which ensures that the regenerated data do not lag on the original under steady-state conditions. Effects especially attributable to amplitude quantization are then studied qualitatively. Since stability diminishes and the sensitivity to noise and instrumental errors increases as the time of prediction is increased, it is essential that the delay involved in the transmission of each sample should be minimized. Furthermore, the sampling servo system is less efficient than a continuous one as a smoothing device, and as much smoothing as possible should be applied at the sending end before sampling.
机译：在伺服系统的设计中必须考虑某些特殊功能，该伺服系统可以满意地处理数字数据。特别是，数据在幅度上被量化，从而引入了非线性效应。它们构成了一系列采样，而不是连续的函数，并且由于低速传输电路或数字设备或两者兼而有之，可能会出现明显的延迟。所有这些都以各种方式有助于降低系统的稳定性。合成方法充分考虑了采样和延迟特征，并可以合并一定程度的预测，从而确保在稳态条件下再生的数据不会滞后于原始数据。然后定性研究特别是归因于幅度量化的效应。由于稳定性会降低，并且随着预测时间的增加，对噪声和仪器误差的敏感度也会增加，因此至关重要的是，应将每个样本传输中涉及的延迟最小化。此外，采样伺服系统的效率不如连续的平滑系统高，因此在采样之前应在发送端尽可能多地进行平滑。

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