Answer:
Modem
Step-by-step explanation:
The devices which coverts Digital signal to analog signal are called DAC. Most common example of DAC is mp3 players/mobile phones. In mp3 players and mobile phones DAC is used for audio. It converts digital audio data stream into analog audio signal.
The devices which coverts analog signal to digital signal are called ADC.
Most common examples are microphones and digital cameras. In microphones analog audio signal are converted to digital data stream for storing or sending from one point to another.
Modem on the other hand is an example of device which converts digital signal to analog and analog to digital. A modem converts digital signal to electrical signal for transmission and upon receiving end converts analog transmission signal to digital data.