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Theories and Laws

Pulse Modulation

  Pulse Modulation

Pulse Modulation

This is the principle of Radar; a short pulse is transmitted and then an echo listened for.
Fig.3 shows a long pulse and three short ones.

Pulse Modulation

This generates the letter B in Morse Code.
Fig.4 shows Pulse Width Modulation (PWM).

The width of the pulse is determined by the amplitude of the modulating signal at that instant.
Fig. 5 shows Pulse Position Modulation (PPM).

Pulse Modulation

Here the width and amplitude of the pulse are constant but its position is determined by the amplitude of the modulating signal.

PULSE CODE MODULATION is where the amplitude of the modulation is measured at regular intervals and a binary number generated to represent that amplitude.


Keywords : Pulse, Modulation, CODE, R.F., Principle, Radar, Morse, Code, PWM
Writer : delon  |
20 Oct 2006 Fri   
|  5.630 Views
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