- You need double the sampling rate as the highest frequency in the sound.
This stems from the Nyquist-Shannon sampling theorem.
- Digital-to-Analog Conversion, the process of returning to an analog signal.
- We can reasonably expect no human can hear frequencies above 22,050 Hz.
This doesn't answer the question.
- Analog-to-Digital Conversion, the process of going from an analog signal to a digital signal.
The other way around.