Electronics > Projects, Designs, and Technical Stuff

Analog Disovery as Audio Analyzer

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timofonic:
What about augmenting Sigrok capabilities based on your choice and research? It would be amazing to have these features on this multiplatform and ever expanding software developed by volunteers!

rjeberhardt:
Excellent!  I must put an Analog Discovery on my Christmas present list.

Russell.

jaxbird:

--- Quote from: rjeberhardt on December 13, 2015, 03:04:11 pm ---Excellent!  I must put an Analog Discovery on my Christmas present list.

Russell.

--- End quote ---


--- Quote from: fivefish on December 12, 2015, 10:52:53 pm ---jaxbird, that is awesome. If you keep this up, and release this software I think I will be buying an Analog Discovery and then send some $$$ your way.

Please make this a "poor man's AP setup" :)

--- End quote ---

Thanks, much appreciate the positive comments. :)



--- Quote from: timofonic on December 13, 2015, 01:19:16 am ---What about augmenting Sigrok capabilities based on your choice and research? It would be amazing to have these features on this multiplatform and ever expanding software developed by volunteers!

--- End quote ---

Maybe at some point, but tbh, I've never had a positive experience contributing to existing open projects.

jaxbird:

--- Quote from: fpliuzzi on December 13, 2015, 12:21:06 am ---Awesome is a good word for your audio analyzer suite. I was perfectly happy with the capabilities of my Analog Discovery, but now I'm really glad that I own one (although my trusty HP334A is looking a little nervous that it could be departing my main test bench soon to free up some much needed space).

Also, a quick thought about your IMD feature. If you see some value in this idea, could the amplitude of the two test tones be made independently adjustable so that you could, for example, test a vintage piece of audio gear using the older SMPTE standard (frequencies of 60Hz and 7KHz, mixed in a 4:1 ratio) if that was desired?

That could make an interesting way to compare the test results of the various IMD standards by supplying the appropriate test frequencies and amplitude ratios.

I tip my hat to you... keep up the excellent work.

--- End quote ---

Thanks, the HP334A is a nice instrument, but it does require a bit a patience to adjust it correctly.

I've made some minor changes that gives more flexibility on the IMD testing, the level of the 2nd tone is now set as a percentage of the level of the 1st tone. That will allow the tests you described.



Always open to suggestions.

jaxbird:
Also added the Output Impedance feature. It requires 2 resistors, just use some within the range of realistic speaker impedance for best results. Could do open vs load, but I feel the two resistor method is better.

Here from measuring the same little class D board, using a log value scale because of the rise at high frequencies, but lin/log is optional.



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