Pulse Modulation In Communication System

Introduction
Pulse modulation includes many different methods of converting information into pulse form for transferring pulses from a source to a destination. The four dominant methods are:
1. Pulse Amplitude Modulation (PAM)
2. Pulse Width Modulation (PWM)
3. Pulse Position Modulation (PAM)
4. Pulse Code Modulation (PCM)
Pulse Amplitude Modulation
Pulse-amplitude modulation, also called PAM, is a form of signal modulation where the signal is encoded in the amplitude of a series of signal pulses. Example: A two-bit modulator (PAM-4) will take two bits at a time and will map the signal amplitude to one of four possible levels, for example −2 volts, −1 volt, 1 volt, and 2 volts. It is widely used in base band
transmission of digital data

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Armature Winding ,Pole Pitch, Coil Span, Commutator Pitch

Now we are going to discuss about armature winding in details. Before going through this section, we should understand some basic terms related to armature winding of dc generator . Pole Pitch Definition of Pole Pitch The pole pitch is defined as peripheral distance between center of two adjacent poles in dc machine. This distance is measured in term of armature slots or armature conductor come between two adjacent pole centers. This is naturally equal to the total number of armature slots divided by number of poles in the machine. If there are 96 slots on the armature periphery and 4 numbers of poles in the machine, the numbers of armature slots come between two adjacent poles centers would be 96/4 = 24. Hence, the pole pitch of that dc machine would be 24. As it is seen that, pole pitch is equal to total numbers of armature slots divided by total numbers of poles, this can alternatively referred as armature slots per pole . Coil Span or Coil Pitch Coil of ...

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Principles of Electronics

Principles of Electronics By- V.K. Mehta, Rohit Mehta

Electrical Engineering

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