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A SEMINAR ON A-D Hybrid Modulation PPT
#1

A SEMINAR ON A-D Hybrid Modulation


.pptx   A-D Hybrid.pptx (Size: 389.82 KB / Downloads: 17)

what is analog

Information can be defined in two forms, digital or analog. Analog signal is considered continuous.
Its signal amplitude can take on any number of values
between the signal maximum and minimum. Voice is analog and can take any
number of volume levels between its “dynamic-range” which is the range of
volumes your vocal cords can produce

what is digital

Digital devices convert analog voice to a
digital signal by process of
sampling and quantization. The analog signal is first
sampled and then quantized in levels and then each level is converted to a binary
number.

Basic Concepts of modulation

Modulation is the process of facilitating the transfer of information over a
medium. Voice can not be sent be very far by screaming. To extend the range of
sound, we need to transmit it through a medium other than air, such as a phone
line or radio. The process of converting information (voice in this case) so that it
can be successfully sent through a medium (wire or radio waves) is called
modulat ion.

What is hybrid modulation

This is a combination of ASK & PSK
Amplitude-shift keying (ASK) is a form of modulation that represents digital data as variations in the amplitude of a carrier wave
Phase-shift keying (PSK) is a digital modulation that conveys data by changing, or modulating, the phase of a reference signal (the carrier wave ).
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#2
This correspondence applies a new delimitation technique to a modulation system. The new limit gives a more stringent location of the threshold level. The variation of the boundary with the degree of phase modulation indicates that a hybrid system provides improved performance for all signal-to-noise ratios.

It can be understood in the following video:
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