a modem
A microphone converts voice sound waves into electrical signals, which are then digitized by an analog-to-digital converter (ADC) to produce digital signals. These digital signals can then be processed and transmitted digitally.
MODEM:A modem takes digital signal from computer and converts them to analog for the phone and reconverts them back
it is an DAC (Digital to analogue converter
yes
no it dont
Actually you have this backwards, the telephone lines can only carry analogue signals (voice band, 20Hz to 3KHz) not digital signals.The device that converts digital signals to analogue signals for transmission over telephone lines is called a phone MoDem(this stands for phone modulator demodulator). At the opposite end of the line it of course converts the telephone analogue signals back to digital signals.
Digital signal is moreefficientimmune to noiseerror freethan analog signal.
A Demodulator (MODEM)
Analog instrument are interface with digital instrument with the help of analog to digital converter(ADC).ADC converts analog signals to digital signals.
Terminal Adapter
Terminal adapter.
A modem converts the digital signals(used by computer)into analog signals(in telephones) and vice versa.