Re: [Discuss-gnuradio] Display frequency from transient plot.

[Rob Croce]

Thank you for the suggestions.  I do in fact come from a very analog background, I have implemented many frequency counters in micro's, so I am thinking in this way.  I will try the suggestions on FFT/frequency sinks. 

On Thu, May 12, 2016 at 4:58 PM, Marcus Müller <address@hidden> wrote:

By the way, I can barely decipher your screenshot. I strongly recommend using the screenshot functionality of your operating system instead of using a camera to digitize the analog lightwaves that were generated from a screen that converted the digital picture to light...
that being said, I don't really understand your question

The time between rise and fall is known since it is plotting it on the time axis,

So: What is the very definition of "frequency"? Right, it's the rate at which a periodic thing happens.
so you measure the time distance between two rising edges, and do 1/that, and instantly have the frequency.
That's a very "analog measurement device" or "cycle counting" way of doing this.

oscilloscope calculates and displays a frequency number.

Hm. What do *you* think the oscilloscope does?
Dan's recommendation was absolutely on-spot. Use a spectrum/fft sink. If you don't understand what "spectrum" is, read a bit wikipedia :) That's really the easiest way I could think of.
Other than that, read up on autocorrelation, and how to calculate it in a DSP system.

Best regards,
Marcus

On 12.05.2016 22:38, Rob Croce wrote:

OK thanks.  I just need to display a number for the frequency of the pulses.  The time between rise and fall is known since it is plotting it on the time axis, so I am wondering if there is anyway I can extract frequency that way.  Similar to frequency counting on a micro, or how an oscilloscope calculates and displays a frequency number.

On Thu, May 12, 2016 at 4:30 PM, Dan CaJacob <address@hidden> wrote:

I would need more details about what you're trying to accomplish, but my first reaction would be to attach an FFT GUI sink.

On Thu, May 12, 2016 at 4:26 PM Rob Croce <address@hidden> wrote:

Hi all.  I have transient pulses that I am displaying using the transient plot, and I am wondering how I can display the frequency of the pulses.  The duty cycle is similar for all pulses, just the frequency is varying.  Is there a simple way to do this?  

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Very Respectfully,

Dan CaJacob

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