Pulse Modulation and its types

1. PULSE MODULATION

2. Definition
Process of taking samples periodically and
converting them into binary codes
Sampling
Process of taking samples periodically from
analog message signals

3. Types of Sampling
• Natural Sampling
• Flat Top Sampling

4. Natural Sampling
It follows the actual shape of the message
signal

5. Flat Top Sampling
It takes samples only during +ve pulse does
not take sample during –ve pulse
Same level is maintained during –ve pulse

7. PAM
 Amplitude of the pulse carrier signal is varied according to the amplitude of the
message signal
 Same like Natural Sampling

8. PWM
 Width of the pulse carrier signal is varied according to the amplitude of the
message signal

9. PPM
 Position of the pulse carrier signal is varied according to the amplitude of
the message signal

10. PCM
 Samples are converted into binary codes

11. Quantization – Rounding Off