Question

voice is input or output device​

Answer 1

Explanation:

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When a microphone is connected to a computer (via an audio interface or another analog-to-digital converter), it sends/inputs information into the computer. This means microphones are input devices. Digital mics with built-in headphone amps that receive info from computers are input/output devices.

Answer 2

Microphones typically output analog audio signals (AC voltages) that require conversion to digital data in order for compatibility with a computer. That means that, by our definition of an input device, a mic signal must be converted to digital data before that microphone can truly be considered an input device.