| demodulation
Demodulation is the process of
decoding an analog signal into digital data. When data is transferred over
phone lines, a modem modulates the data into audible tones "carried" on
frequencies between 0 Hz and 4 KHz. Once the data reaches its intended
destination, another modem demodulates the signal back into digital data.
Cable TV networks also use modulation techniques to transfer data. But
instead of audible tones, cable has sophisticated digital modulation
schemes to greatly increase the amount of data that can be sent. |