Arbitrary Waveform Signal Generator

[vintageampfixer]

I'd like to be able to play various arbitrary waveforms which have been generated in Excel or something and visualised using charts - a couple of examples below. I can export the waveform chart data in CSV format ... and I can then import it into PicoScope's Arbitrary Waveform Generator which replays it well but I'd really like something to allow the sound to be replayed via the Windows OS and output to my laptop ... because there are times when you want a quick (and dirty) answer, and where that'd be good enough ... it'd save me connecting my PicoScope, finding an amplifier and speaker plus all the cables to connect it ... OK, I'm being lazy really but I'd still really like a solution. Did I mention free? There must be something that's a free download ...

Any ideas?

 

[ruairioflaherty]

Have you looked at National Instruments Waveforms software?

 

[vintageampfixer]

Have you looked at National Instruments Waveforms software?

I hadn't. It was a bit of a journey to make that software work, but once I found the list of newer Beta versions I did get something going.

 

[Voyager10]

Python can read CSV files (https://docs.python.org/3/library/csv.html) and write WAV files (https://docs.python.org/3/library/wave.html) so a quick script might do the job, if you don't mind some command-line action. If I get some time I'll knock something up.

 

[vintageampfixer]

Python can read CSV files (https://docs.python.org/3/library/csv.html) and write WAV files (https://docs.python.org/3/library/wave.html) so a quick script might do the job, if you don't mind some command-line action. If I get some time I'll knock something up.

Cool!

The CSVs started with 360 samples in the range -1 to +1 making up a single cycle but currently have either 1024 samples for PicoScope or 4096 for the National Instruments Waveforms software. Neither is time-bound in the CSV, rather a period is set in either PicoScope or the Waveforms software. The number of samples to make up one cycle is fairly easy to alter.

 

[Voyager10]

OK, the attached Python script seems to work for me (I've had to rename it csv2wav.py.txt to attach it).

On a Mac you can run it (in Terminal) like this:

$ python3 csv2wav.py "linear csv.txt" out.wav
Read 1024 input samples
Wrote out.wav

Windows should be similar, using CMD.EXE.

Output WAV file is attached - looks like a low-frequency sawtooth-ish wave?

 

[vintageampfixer]

looks like a low-frequency sawtooth-ish wave

Thanks for that, I'll dig into it in a bit. The waveform should be the left hand of the two images in my OP.