Re: How can I split a periodic signal?

[Johannes Demel]

Hi all,

since Audacity is targeted at audio samples, it might be interesting to 
have a tool that is more targeted at IQ samples.

I've heard/read about quite a few people who use "inspectrum":
https://github.com/miek/inspectrum
(I hope this is the correct repo.)

A somewhat older tool might be "baudline":
https://www.baudline.com/
(I used it in the past but I'd probably switch to inspectrum nowadays).

Cheers
Johannes


On 25.08.22 20:33, Mike Markowski wrote:
> James,
>
> I find an easy approach is to write the signal out as alternating i/q 
> binary if it's not already.  That can be read into audacity as stereo 
> (File -> Import -> Raw), edited and written back out as raw data without 
> header (File -> Export -> Export Multiple, and choose Raw Headerless). 
> Don't worry about audacity's sample rate because you're editing raw i/q 
> anyway.  This allows editing down to the sample level.
>
> Good luck!
> Mike ab3ap
>
> On 8/25/22 1:52 PM, James Wanga wrote:
> > I'm receiving a phase modulated signal representing a periodic pulsed 
> > byte that looks something like this:
> >
> > -------------|-|||--||-------------|||--||||-------------|--||||-|------------- 
> >
> >
> > I'm trying to understand how I might split this signal roughly halfway 
> > between each pulse of activity so I can save each pulse as a separate 
> > IQ fil, bit like this:
> >
> > ------|-|||--||------
> >
> > -------|||--||||-------
> >
> > ------|--||||-|------
> >
> > The split does not have to be precise, it only needs to avoid 
> > bisecting any of the pulses. Here are some things I've tried.- 
> > Creating a custom block on the receiver that uses a timing interval. 
> > Unfortunately, the pulses aren't perfectly periodic so eventually this 
> > causes the split to drift.[...]

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