Which is a common sample rate in digital audio?

• A. 8 kHz
• B. 192 kHz
• C. 320 kbps
• D. 44.1 kHz

Answer: (D)

The main idea here is understanding what a sampling rate is and why 44.1 kilohertz is a common default. A sampling rate is how many times per second the analog audio signal is measured. To faithfully reproduce the typical audible range (up to about 20 kHz), you need at least twice that frequency, which means a minimum around 40 kHz. 44.1 kHz provides a comfortable margin and has become the standard because it balances good sound quality with manageable data size. It’s the rate used for audio CDs and is widely supported across devices and formats, which is why it’s so common in digital audio workflows.

The other choices aren’t as fitting for common sampling in music. 8 kHz is too low for full-range audio and is mainly used for telephony with lower fidelity. 192 kHz is a very high sampling rate used by some professionals for specialized purposes, but it isn’t as broadly standard as 44.1 kHz. 320 kbps is a bitrate, not a sampling rate, so it doesn’t describe how often samples are taken per second.