Remote control is an electronic device which
helps the observer to operate the television from
a distance without leaving his or her seat. In a
remote control, there are three main units.
(i) A transmitting unit: which trasmits the
command signal, (ii) a frequency controller,
which selects the suitable frequency for a
particular function to be performed and (iii) a
mechanical drive or electronic colur unit,
which changes the volume or colour according
to the signal.
There are two mains types of remote control
receivers : (i) Electromechanical system
(ii) Electronic system.
