The difference between digital and analog signals may seem straightforward, but there is a ton of nuance that defines the characteristics of the two systems.

An analog filter removes the high-frequency distortion that's generated in the resulting square wave, and the result—thanks to Nyquist again—is the original signal in analog form.

For example, state-of-the-art analog-to-digital converters (ADCs) are incredibly capable devices and able to convert analog signals at very high frequencies to digital form.

These signals are called images or aliases. Analog low-pass filters can remove these images and other spurious noise from the signal. Practical analog filters can be expensive, however.

Addressing a major roadblock in next-generation photonic computing and signal processing systems, researchers at the Harvard ...

Confused by analog-to-digital converter specifications? Here's a primer to help you decipher them and make the right decisions for your project.

Jargon Buster: DAC- A digital-to-analog converter takes digital audio data and transforms it into an analog signal to send to headphones or speakers.

To convert from analog to digital, the analog signal first is sampled at a carrier frequency. For a given sample period, the area under the analog signal equals the area under the PWM pulse.

With a regular radio, you'll hear the usual analog version. With a HD-compatible radio, the radio tunes in to the digital programming on HD stations and the analog signals for non-HD stations.