First, you can classify any signal as analog or digital.

首先，你可将任意信号分为模拟信号或数字信号两大类。

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The electrical control signal can be either analog or digital.

电气 控制 信号可以是模拟或数字。

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Each memory element can store data represented in analog or digital form.

每个存储器元件可存储以模拟或数字形式表示的数据。

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You can record from any stereo source with a stereo in-line jack and won't have to get any specialized software to put recordings back on your computer--all you need is an analog or digital source at bit rates up to 160 kbps.

FORBES: Magazine Article

Investors should be looking at companies today that have the ability to transform an industry from analog to digital or have the ability to create the infrastructure to facilitate digital properties or transactions.

FORBES: Importance of Being a Platform (Apple, LinkedIn, Amazon, eBay, Google, Facebook)

Under the Federal Communications Commission's requirement, cable operators must either switch to all-digital systems, or carry both the digital and analog signals of local stations in the first three years after the February 2009 conversion.

WSJ: Cable Must Air Broadcast Signals