Signal Power and Energy

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Explains power and energy using examples of signal waveform plots.

* Note that there is a minor "visual typo" in the plots for power and energy. I drew rectified sine waves by mistake, but they should be sine waves with a vertical offset (ie. the sharp "valleys" should be smooth). This is because sin^2 (x) = 1/2 (1 - cos (2x)). This means that x(t)^2 should be a sinusoid of twice the frequency of the original signal, with a maximum amplitude of 1 and a minimum amplitude of 0.

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I always had a problem understanding this notion... now it's as clear as water. Thanks a lot. Keep blessing us with more valuable contents

officiallounge
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A 2-hour lecture in 6minutes. Thank you!!!

stephikebudu
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you're doing great sir, but all you need to improve is that to louder your voice by using a

ganeshchandrameesala
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Could I offer a correction in this video please? When a sinusoid is squared, we have the relationship sin^2 (x) = 1/2 (1 - cos (2x)). This means that X(t) ^2 should be a sinusoid of twice the frequency of the original signal with a maximum amplitude of 1 unit and a minimum amplitude of 0 units, so an average value of 1/2 unit. I believe the appearance of a full wave rectified signal shown as X(t) ^2, whilst showing the removal of any negative polarity signal, is incorrect.

The above said, all else made good sense. and gave valuable tuition in the concepts of signal energy and power. I appreciate your work there Iain.

vaughanwilliamson
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It was very helpful. Can you please tell the units of the energy if the signal is in volts, please?

AmitGupta-zxcz
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Great video. I learned a lot. Can you please create some video to explain the different digital filter?

voidgamez
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Can you suggest books for digital signal processing

BOYAJAYASIMHA
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Will the average power change for a time scaled signal?

theodora
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dude what the hell you put the whole idea into my head ez

jhenshaw
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I feel so stupid. I never understood what the how to calculate the power of a signal but now its obvious that it always just meant the average power of the signal.

Nathan-pj
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You need to increase the power of your vocal signal.

adwayduttagupta