| There are several ways electronically that the signals can be
combined including AM (Amplitude Modulation),
FM (Frequency Modulation), PCM
(Pulse Code Modulation) and others. However, for the purposes of
understanding, let us just say that the signals are added together
during modulation and then transmitted over the airwaves. On the
receiving end there would be a demodulator. The purpose of the
demodulator is to remove the high frequency carrier and recover our
original audio or data information. Continuing with our simple
approach that these signals were added together, consider that the
demodulator subtracts away the high frequency carrier, leaving us with
the low frequency audio and data information that we wished to transmit. |
|
Shows a good example of mixing - modulating in order to transmit
long distances using a high frequency carrier (FM
example) |
