Showing posts with label fm. Show all posts
Showing posts with label fm. Show all posts
Sunday, 2 March 2014
analog signals
ANALOG SIGNALS:
An analog signal that is transmitted as a continuous wave. Analog
signals change all the time. The transmission power varies over a
continues range with respect to time,sound,light and radio waves. The
signal measured in volts and its frequency in hertz.
digital signal
DIGITAL SIGNALS:
W digital signal transmission power only discrete set of values with in a
given range i.e high and low voltage rather than by fluctuating levels
in a continuous stream. A digital signal is sequence of voltage
represented in binary form.
what is modulation?
MODULATION:
Technique by which a digital signal is converted to analog form is known as modulation.
what is de-modulation?
DE-MODULATION:
The technique by which analog signal is converted to digital form is demodulated.
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