DIGITAL MODULATION ASK FSK PSK FULL

So here the basic purpose of Frequency Shift Keying (FSK), is to modulate (change/switch) the frequency of the carrier wave, according to the digital input signal. Now to understand the concept of frequency shift keying, look at the image shown below carefully.

#Watch large Collection of Engineering Video Lectures Here. In FM the modulating signal is of analogue nature while in FSK modulating signal is digital. The difference is only of the nature of the modulating signal. In Frequency Modulation (FM), the frequency of the carrier wave is varied according to the instantaneous value of the modulating signal, in the same way in frequency shift keying also, the frequency of the sinusoidal carrier wave is varied (switched) as per the digital input signal. The reason behind why FSK is analogous to FM, is. It is analogous to frequency modulation (analog modulation). If the frequency of sinusoidal carrier wave is varied (switched) as per the digital input signal, then it is known as the frequency shift keying (FSK). Now we will discuss the Frequency Shift Keying (FSK) That is why amplitude shift keying (ASK) is also called as 'ON - OFF Keying (OOK)'. The carrier wave is either not transmitted or transmitted for digital input signal '0' or '1' respectively. Here the amplitude of the sinusoidal carrier wave is switched, as per the digital input signal.

DIGITAL MODULATION ASK FSK PSK FULL

But for binary '1' at three places, the full carrier wave has been transmitted without any change. You can observe this phenomena in the image carefully, that in this example, we have digital input signal '0', at three places, so for these three digital '0', no carrier signal has been transmitted. Now Let's understand the concept of amplitude shift keying (ASK) with the help of an example. In amplitude modulation, the modulating signal is of analog kind but in digital modulation, it is a stream of digital bits. Therefore amplitude shift keying is analogous to Amplitude Modulation (analog modulation).ĪSK is analogous to AM, because in Amplitude Modulation (AM), amplitude of the carrier wave is changed according to the instantaneous value of the modulating (message) signal, in the same way in ASK also, the amplitude of the carrier wave is switched (varied) according to the instantaneous value of the modulating signal (digital input signal). In ASK, the amplitude of the carrier wave is changed (switched) according to the digital input signal (modulating signal). So now let's discuss each digital modulation technique (ASK, FSK and PSK) in detail. Here it is interesting to note that, the three forms of digital modulation techniques that is ASK, FSK and PSK are analogous to AM, FM and PM of continuous wave modulation respectively. In both of these modulation techniques, the carrier wave is of analog form. In continuous wave modulation, the message signal is of analog nature but in digital modulation, the message signal is of digital nature (Binary or M-ary encoded version). #ADVANTAGES AND DISADVANTAGES OF DIGITAL COMMUNICATION SYSTEM

The basic difference between continuous wave Modulation and digital modulation techniques is based on the nature of message signal (modulating signal).

So now let's Understand the basic difference between continuous wave modulation and digital modulation-ĭifference between Continuous Wave Modulation and Digital ModulationĪmplitude Modulation (AM), Frequency Modulation (FM) and Phase Modulation (PM) are the examples of Continuous Wave (CW) modulation, while Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK) and Phase Shift Keying (PSK) are examples of Digital Modulation Techniques. So if amplitude of the carrier wave is varied, then it is called as amplitude modulation (AM), but if frequency or phase of the carrier wave is varied, according to the instantaneous value of the modulating signal, then it is known as frequency modulation (FM) or phase modulation (PM) respectively. Modulation is a process, where some characteristic of the carrier wave (amplitude, frequency or phase) is varied in accordance with the instantaneous value of the modulating (message or baseband) signal. So first of all let's understand, what is modulation?ĭigital Modulation Techniques (ASK, FSK, PSK, BPSK) Video In this post we will discuss three kinds of digital modulation techniques that are- Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK) and Phase Shift Keying (PSK).

Digital modulation ask fsk psk