How to create time delay between two square signal waveforms

[newbieeng]

Hello. I am trying to create a time delay between two square signal waveforms having the same frequency, however, I cannot do that. I try to implement what I found in the forum here and here. What could the problem be?

[JW-JnJ]

I would use the phase input to the square wave. Give each waveforms either a time or phase input by adding it to your cluster. If you choose time, then calculate the phase (time*frequency*360= phase in deg).

Also, the reset signal needs to be true to set the phase in that VI.

[newbieeng]

Thank you Josh. I have limited knowledge about signals and their manipulations. What is phase for signal? Is there any reinforcement that I can consult about signals/waveforms?

How can I implement your suggestion?

What is the problem with the vi that I sent? I really do not understand. Changing to for the second waveform does not affect it, why?

[GerdW]

Hi newbie,

I cannot open your VI at the moment but all many of those signal generation functions have a "Phase" input:

Two square waves with 90° phase shift in between:

[newbieeng]

I got it GerdW, thank you. How could I manipulate the phase to make a time delay? For instance, I want to generate the first signal immediately as the vi runs, but I want to start generation of the second signal after let's say 10 ms after the first one starts. How could I do it via manipulating of phases? Is there an equation (relation) between phase and time delay?

[GerdW]

Hi Egemen,

Is there an equation (relation) between phase and time delay?

Yes: sample rate…

I want to start generation of the second signal after let's say 10 ms after the first one starts. How could I do it via manipulating of phases?

When you want to start one waveform laterthan the other I would just prepend some additional samples (with value=zero) to the 2nd waveform…

[newbieeng]

Hi GerdW,

What is the equation of sampling rate in which I can use phase as a parameter? I do not know this equation. I am a newbie at generating signals, trying to learn.

How can I determine the time by use of empty samples? How can I determine the sample number of these empty values?

[GerdW]

Hi Egemen,

Basic equation1:

time = #samples / samplerate (units: [s] = [S] / [S/s])

Basic equation2:

phase = #samples / samplerate / period  (units: [unitless] = [S] / [S/s] / [s])

This is basic physics!

[newbieeng]

Thank you GerdW.

Josh, I do not think that I can solve my problem with manipulating with phase parameter. It is a period, so its changes affect in just one cycle. I need shifting the second signal far away, let say 5 cycle forward from the first one. How can I do that shifting?

By the way, I just realized that the waveform graph "ignore time stamp" function is on, I think that's why I saw them coincident.

[GerdW]

Hi Egemen,

as I wrote in message #6: prepend as many samples as you need to…