2. Process of changing an electrical signal, such as by
superimposing the signal's characteristics onto a
carrier wave so that it carries the information
contained in the signal.
3. Digital modulation is the
process of converting a
digital stream into an
analog signal suitable for
RF transmission.
Digital Modulation
4. There are three basic types of digital modulation
techniques:
Amplitude Shift Keying (ASK)
Frequency Shift Keying (FSK)
Phase Shift Keying (PSK)
5. Advantages
Digital modulation can
easily detect and correct
the noise.
Security is more in
digital modulation.
Digital modulated signal
can traverse a long
distance
The receiver must have
some form of
synchronization with the
transmitter to decode the
digital information.
Synchronization wastes
bandwidth because it is
not 'information‘.
Disadvantages
