For playback, digital audio needs to be transformed back again to an analog sign that has a DAC. Based on the Nyquist–Shannon sampling theorem, with some practical and theoretical restrictions, a band-limited version of the first analog sign is usually precisely reconstructed within the digital signal. The problems are introduced https://medium.com/@caitlyngrace/accessible-audiobooks-for-disability-why-the-need-aba86d2e39fa