Introduction:
Modulation is the method of changing the carrier signal in according to the message signal. The high-frequency sin waveform acting as carrier signal in the process of modulation. What is digital modulation? Digital modulation means an analog signal of carrier is converted by a digital data bit stream. Digital modulation method is use to convert digital signal to analog and the responding demodulating is applied to convert analog signal to digital signal.
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Digital modulation methods:
Let us see about what are methods used in digital modulation,
Phase shift keying
Frequency shift keying
Amplitude shift keying
What is phase-shift keying (PSK)?
It is one of the is a digital modulation process which is used to transfer data signal by changing or converting the phase of an indication signal this wave is known as the carrier wave.
It is used for limited number of phases, every assigned an exclusive set of digits which is should be binary.
Frequently, every phase encodes an equivalent number of bits. Every pattern of bits creates the symbol that is denoted by the particular phase.
The demodulator, which is reassigned particularly for the symbol that set is used by the modulator, find out the phase of the received signal and maps it return to the symbol it denoted, thus getting the original data.
What is frequency-shift keying (FSK) ?
It is a frequency modulation process in that digital message is transmitted during distinct frequency varying of a carrier signal.
The simplest FSK is well-known as binary(0s and 1s) FSK (BFSK).
What is amplitude-shift keying (ASK)?
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It is a pattern of modulation which denotes digital data as changes at the amplitude of a carrier wave at that time frequency and phase as constant.
The stage of amplitude used to symbolize binary reason 0s and 1s.
A carrier signal acting as ON or OFF switch.
In the output signal, logic 0 is noted by the nonappearance of a carrier, thus giving OFF/ON keying action and therefore the name specified.
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