Introduction:
Pulse witdth modulation (PWM) is a modulation technique used to encode a message into a pulsing
signal. Although this modulation technique can be
used to encode information for transmission, its main use is to allow the
control of the power supplied to electrical devices, especially to inertial
loads such as motors
Application
Ø PWM is used to control servomechanisms; see servo
control.
Ø In telecommunications, PWM is a form
of signal modulation where the widths of the pulses correspond to specific
data values encoded at one end and decoded at the other
Ø
PWM can be used to control the amount of power
delivered to a load without incurring the losses that would result from linear
power delivery by resistive means. .
Ø PWM is also used in efficient voltage
regulators. By switching voltage to the load with
the appropriate duty cycle, the output will approximate a voltage at the desired
level. The switching noise is usually filtered with an inductor and a capacitor.
Ø PWM is sometimes used in sound (music)
synthesis, in particular subtractive synthesis, as it
gives a sound effect similar to chorus or slightly detuned oscillators played together
Block
Diagram:
Different
Cases
1. Fine frequency and
Number of samples
2. Low
Frequency and Fine number of samples.
Conclusion
We performed this lab and we took following result
1. By
decreasing frequency number of pulses also decreases.
2. By
decreasing delay pulse move more slowly.
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