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a digital audio system, an analog electrical signal representing the sound is converted with an analog-to-digital converter (adc) into a digital signal, typically using pulse-code modulation . this digital signal can then be recorded, edited, modified, and copied using computers , audio playback machines
converted back into physical waveforms via a loudspeaker . analog audio retains its fundamental wave-like characteristics throughout its storage, transformation, duplication, and amplification. analog audio signals are susceptible to noise and distortion, due to the innate characteristics of electronic circuits...
https://en.wikipedia.org/wiki/Digital_audio