Voltage divider - Looking for a reference with respect to Vout resistnce

[psparky]

lol! Whoopsie! My bad.

I see it now.

So you are describing multiplying two sinusoidal functions and taking the area under the curve. You are saying then the area under the curve will always be zero unless the frequencies are identical?

Is this better? If so I will ask more questions.

 

[psparky]

I think convolution is easier to understand if you consider it in the discrete(digital) version, and do some real examples.

Fantastic. Great.

Throw in your two cents as well oh master. Explain. Go ahead.

 

[DragonPetter]

Fantastic. Great.

Throw in your two cents as well oh master. Explain. Go ahead.

Hahaha, I am definitely not a master of convolution. I just remember sitting in class and seeing the discrete example. I thought it made more sense than flipping a waveform and then overlapping through another waveform.

There's what I'm talking about:


Edit: Doesn't that seem simpler than trying to use integrals?

 

[DragonPetter]

Oh and to your question of why we use it. There are lots of reasons, but a cool property I can think of is that the waveform you get out of convolving a system's response to an impulse function gives you the entire description of that system.

 

[jim hardy]

thanks I've bookmarked that DSP link.

In early 70's some professors with research money came to my plant and studied process signals to end of developing diagnostic tools.
FFT was new then and they carried a DEC PDP11 for their measurements.

As a young engineer i was astonished at the information they could glean.
They measured flow rates, movement and natural frequencies of reactor core barrel(it's a giant pendulum), sensor response times, ... They used terms like Cross-Power Spectral Density, Coherence , Convolution, and were kind enough to explain to me the very basics of what they meant.

Later i built an instrument to measure torsion in main turbine shaft .
We captured an electrical trip of generator which is an impulse unloading of the shaft as Dr-petter mentioned. It confirmed 7 hz fundamental natural frequency and several other minor ones.
But all i did was gather raw data for the turbine manufacturer (who was quite appreciative - he doesn't have a huge steam supply for such testing).

Hence my reverence for higher math
and my empathy for those (like me) who just aren't equipped for it.

But i digress.

Whole point was Thanks for DSP link - I'll read it !

 

[psparky]

Oh and to your question of why we use it. There are lots of reasons, but a cool property I can think of is that the waveform you get out of convolving a system's response to an impulse function gives you the entire description of that system.

Now you're talkin...