What device is primarily used to convert analog signals into digital form?

The device that is primarily used to convert analog signals into digital form is the Analog-to-Digital Converter (ADC). This technology is essential for digital signal processing as it allows continuous analog signals, which can take any value within a range, to be represented in a digital format, consisting of discrete values.

In practice, an ADC samples the analog signal at specific intervals and converts these samples into a binary representation, enabling digital systems to process and analyze real-world data, like sound or temperature readings. This conversion is crucial in many applications, including audio recording, digital communications, and data acquisition systems.

The other devices mentioned perform different functions: a Digital-to-Analog Converter converts digital signals back into analog form; a Signal Amplifier boosts the strength of a signal without changing its format; and a Pulse Modulator is used to modulate a signal into a form suitable for transmission, rather than converting it between analog and digital formats. Understanding these distinct roles highlights the importance of the ADC in bridging the analog and digital worlds.