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Chapter 7: Pulse Modulation Basic concepts Modulation: a process by which a property of a parameter of a signal is varied in proportional to a second (given) signal. We use modulation technique to alter signals in time and frequency to accomplish desired objectives. Analog or continuouswave (CW) modulation: is used basic types of pulse modulation
In Continuous Wave Modulation (Amplitude Modulation, Frequency Modulation, Phase Modulation) the carrier wave used is continuous in nature, while in case of pulse modulation, the carrier wave is in the form of pulses. So now let's discuss different types of Pulse Modulation Techniques in detailPulse modulation can be categorized broadly into two types
Common analog modulation techniques are include: Amplitude modulation (AM) (here the amplitude of the carrier signal is varied in accordance with the instantaneous amplitude of the modulating signal). Angle modulation, which is approximately constant envelope. basic types of pulse modulation
Pulse Amplitude Modulation. Pulse amplitude modulation is the basic form of pulse modulation. In this modulation, the signal is sampled at regular intervals and each sample is made proportional to the amplitude of the modulating signal. Before we study in detail about PAM lets know the concepts of modulation. We begin our discussion of digital modulation by starting with the three basic types of digital modulation techniques. These are; AmplitudeShift Keying (ASK) FrequencyShift Keying (FSK) PhaseShift Keying (PSK) All of these techniques vary a parameter of a sinusoid to represent the information which we wish to send. modulation. We begin our discussion of digital modulation by starting with the three basic types of digital modulation techniques. These are; AmplitudeShift Keying (ASK) FrequencyShift Keying (FSK) PhaseShift Keying (PSK) All of these techniques vary a parameter of a sinusoid to represent the information which we wish to send. basic types of pulse modulation and study of different types of pwm controlled methods are shown in this paper. The different PWM techniques are Singlepulse modulation, Multiple pulse modulation and Sinusoidal pulse width modulation (Carrier based Pulse Width Modulation Technique). Pulse Width Modulation. The waveform for this type of PWM is denoted as (b) in the above figure. The center of the pulse being constant, the leading edge and the trailing edge varies according to the message signal. The waveform for this type of PWM is denoted as (c) shown in the above figure. Pulse Duration Modulation (PDM) or Pulse Width Modulation (PWM): It is a type of analog modulation. In pulse width modulation or pulse duration modulation, the width of the pulse carrier is varied in accordance with the sample values of message Usually high frequency sine wave is used as a carrier wave signal. These modulation techniques are classified into two major types: analog and digital or pulse modulation. Prior to discussing further about the different types of modulation techniques, let us understand the importance of modulation.
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