Signal Power and Energy

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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[@Celius-o8m]

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

[@iain_explains]

Glad to hear that the video was helpful.

[@stephikebudu]

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

[@iain_explains]

Glad it was helpful!

[@ganeshchandrameesala257]

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

[@vaughanwilliamson173]

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.

[@iain_explains]

Dam, you're right. Thanks for pointing that out. It's a "visual typo". Pity I can't upload a corrected version. I'll add a comment to the description under the video. Thanks again.

[@AmitGupta-zx7cz]

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

[@iain_explains]

Power = V^2/R in Watts, and we normally assume a reference resistance of 1 ohm, so the Energy (which is Power times time) will be in Joules.

[@jaxpher]

Salamat

[@sharkboyloga]

Fantastic video

[@iain_explains]

Thanks. Did you see that there's a full list of videos that might also be helpful on the channel at iaincollings.com ?

[@voidgamez3713]

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

[@iain_explains]

Thanks. Glad the video helped. Are there specific filters you are interested in?

[@voidgamez3713]

@@iain_explains if you can make a series video to talk about basic filter like FIR,FIR then some advance filter like kalman that will be great 👍

[@iain_explains]

Good idea. I'll add those topics to my "to do" list.

[@honestman276]

Thanks. From Bangladesh.

[@iain_explains]

Glad you found it useful.

[@jhenshaw87]

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

[@iain_explains]

Glad it helped.

[@theodora2506]

Will the average power change for a time scaled signal?

[@iain_explains]

It depends on what you mean by "time scaled".

[@BOYAJAYASIMHA]

Can you suggest books for digital signal processing

[@iain_explains]

There are so many, it really depends on which aspects you're focused on.

[@BOYAJAYASIMHA]

@@iain_explains I want to learn signal processing in LTE .Which books do you suggest to study from basics to adavance level. thanks

[@Nathan-p1j]

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.

[@iain_explains]

I'm glad the video helped.

[@adwayduttagupta9887]

You need to increase the power of your vocal signal.