The two digital signal types are the on-off signal and the pulse train signal.

这两类数字信号分别为通断信号和脉冲序列信号。

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The two digital and three analog signal types are unique in the information each conveys.

这两类数字信号和三类模拟信号各自传递着独一无二的信号。

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However, to discuss signal measurement methods, you should classify a given signal as one of five signal types.

然而，在讨论信号测量方法时，你应该将所给信号归入五大类信号中的一种型号类型。

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Different fonts could be a shorthand to add different emotional cues or signal different types of messages.

FORBES: Connect

Varying the geometry allows the pair to discern better the signal they see from different types of surface.

BBC: Mapping Earth's surface in 3D

This method can let the team know whether the contaminant-degrading microbes are healthy and growing, or, under some types of stress, possibly signal the need for more active remediation efforts at a site.

FORBES: Guest post written by Aaron Peacock