Before a computer can respond to an analog control loop output, it must pass through what device?

In order for a computer to process an analog signal, it is essential that the signal be converted into a digital form that the computer can understand and manipulate. This is achieved through the use of a digital converter, commonly referred to as an Analog-to-Digital Converter (ADC).

The primary function of the ADC is to take continuous analog signals, which vary in amplitude and can represent a wide range of values, and convert them into discrete digital values, typically represented in binary form. This conversion enables the computer to interpret the signals correctly and make calculations or decisions based on the data received.

Once the analog signal is transformed into a digital format, the computer can process, store, analyze, and even execute control commands based on the signal’s information. This is a fundamental process in various applications such as automation systems, data acquisition systems, and control loops.

The other options, while related to signal handling, do not fulfill the specific requirement for conversion from analog to digital. Therefore, the digital converter is the correct choice for ensuring that a computer can effectively respond to outputs from an analog control loop.