Can period of such signal be found.

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Discussion Overview

The discussion revolves around determining the period of a combined signal formed by the addition of two square waves with different periods. Participants explore whether the resulting signal is periodic and how to theoretically find its period, particularly in the context of voltage rather than current.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant questions if the combined signal of two square waves is periodic, given their different periods of √6 seconds and 1/√6 seconds.
  • Another participant suggests that the signals will be periodic if their periods are in a whole number ratio, calculating the ratio as √6 divided by 1/√6, resulting in 6.
  • There is a recommendation to visualize the signals by drawing them, indicating that the slower square wave will dominate the combined output.
  • One participant clarifies that their inquiry is not homework but rather a question from class presentations, seeking theoretical understanding of how to find the period.
  • There is a suggestion to use graph paper to visualize the addition of the two waveforms to better understand the resulting signal's period.

Areas of Agreement / Disagreement

Participants express varying views on the periodicity of the combined signal and the method to determine its period. No consensus is reached on the theoretical approach or the implications of the findings.

Contextual Notes

Participants reference the need for a whole number relationship between the periods of the individual signals to establish periodicity, but the discussion does not resolve the implications of this condition fully. There is also mention of using voltage instead of current for analysis, which introduces additional considerations.

Who May Find This Useful

This discussion may be useful for students and educators interested in signal processing, waveform analysis, and the theoretical aspects of combining periodic signals.

John Atkinson
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How to find the period of two signals added for example:
if f= s1+s2 where s1 is a squre wave of (+ -) 1 A, period √6 secs and s2 is a square wave of (+ -) 1 A, period 1/√6 secs.

Is this signal periodic if not why?

Can anyone let me know about some link where I can learn all the examples of such type.
 
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]The signals will have a repeating (periodic) pattern if their periods are in a whole number ratio to each other.

So, you have a ratio of √6 divided by 1/√6. That is √6 times √6. Or 6.

It is easier to work this out if you use voltage instead of current. To add voltages, you can just put two voltage generators in series.

However this seems like homework, so you need to make an effort to do some of it yourself. (Them's the rules!)

I suggest you get a free copy of LTSpice and use this to work out these oddball problems.

There will be one square wave that is faster than the other.
So draw it out on paper.
The slower square wave goes to 1 volt and then has the faster one imposed on it, so the result is a sqaure wave between 0 volts and 2 volts.
Then the slow wave goes to -1 volt and the same thing happens, except from -2 volts to zero volts.

http://dl.dropbox.com/u/4222062/2%20sq%20waves.PNG
 
Last edited by a moderator:
vk6kro said:
]The signals will have a repeating (periodic) pattern if their periods are in a whole number ratio to each other.

So, you have a ratio of √6 divided by 1/√6. That is √6 times √6. Or 6.

It is easier to work this out if you use voltage instead of current. To add voltages, you can just put two voltage generators in series.

However this seems like homework, so you need to make an effort to do some of it yourself. (Them's the rules!)

I suggest you get a free copy of LTSpice and use this to work out these oddball problems.

There will be one square wave that is faster than the other.
So draw it out on paper.
The slower square wave goes to 1 volt and then has the faster one imposed on it, so the result is a sqaure wave between 0 volts and 2 volts.
Then the slow wave goes to -1 volt and the same thing happens, except from -2 volts to zero volts.

http://dl.dropbox.com/u/4222062/2%20sq%20waves.PNG

It is not HW it is just one of the questions in class presentations for which I am curious to know how to find the period of the signal theoretically. Can you suggest me some book.

As you suggested about the signal to be voltage can you explain the same assuming it to be voltage. How to find the period as I want to clear my doubts.
 
Last edited by a moderator:
John Atkinson said:
It is not HW it is just one of the questions in class presentations for which I am curious to know how to find the period of the signal theoretically. Can you suggest me some book.

As you suggested about the signal to be voltage can you explain the same assuming it to be voltage. How to find the period as I want to clear my doubts.

If you look at the diagram above, you will see that the period is the same as that of the lowest frequency square wave.

Once you establish that the two waveforms have a whole number relationship, then you can say this.

I can't suggest a book, but I think a piece of graph paper would be more useful.
Just draw the two waveforms and then go along and add them to get a graph like the one above.
 

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