The resulting limit, given in units of bits per second, is the absolute maximum rate of error-free communication given signal strength and noise level.

在给定信号强度和噪声水平的情况下，以比特每秒为单位给出的最终限制是无差错通信的最大绝对速率。

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Instead of using optics for the entire retrieval process, they use it to guide a second, electronic (and error-free) search of a large, conventionally stored database.

ECONOMIST: Optical recognition