What is a common sample rate for digital audio recording?

The common sample rate of 44.1 kHz for digital audio recording is primarily used for music and standard audio content. This rate is chosen because it effectively captures the full range of human hearing, which generally extends up to about 20 kHz. According to the Nyquist theorem, to accurately sample a signal, it needs to be sampled at least twice its highest frequency. Thus, a sample rate of 44.1 kHz allows for capturing frequencies up to about 22.05 kHz, well within the audible range. This makes it an ideal choice for CD audio quality, and it has become a standard in the industry.

The other options, while valid sample rates, are either higher or less commonly used for standard music recordings. For instance, 22.5 kHz is lower than 44.1 kHz and may miss capturing certain audio details, whereas 88.2 kHz and 96 kHz are often utilized for high-resolution audio formats, typically in professional settings where enhanced sound quality is desired but are less common for mainstream use.