Oona (windytan)

@windyoona

Programmer interested in signals and sound waves // blog:

Finland
Vrijeme pridruživanja: prosinac 2011.

Medijski sadržaj

  1. 26. sij

    The right border can look messy in some fast YUV modes. Idea: optional zoom-in to hide 1% overscan (only the top-right corner shown here)

    Two versions of the same TV test card, one of them showing a jagged green right border.
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  2. 26. sij

    Moderate levels of noise could optionally be removed by adapting the FFT windowing function to SNR (based on F2DC's article in the May/June 2003 issue of QNX: "Some Thoughts on Real-Time SSTV Processing")

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  3. 26. sij

    Experimental command-line SSTV decoder used with iTerm2's imgcat

    Screenshot of a command-line program showing textual debug info followed by a picture of a TV test card within the terminal.
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  4. 25. pro 2019.

    Another one based on Chu et al. (2002): Detailed Directivity of Sound Fields Around Human Talkers

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  5. 25. pro 2019.

    Reading fascinating research papers at 2am again. Here's one about the frequency-dependent directivity of the human voice.

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  6. 21. pro 2019.

    Found a more densely sampled database of head-related impulse responses to use in 3D experiments. The 2001 paper has friendly-looking diagrams as well.

  7. 20. pro 2019.

    Doppler effect emerges when the acoustic path tracing update rate is high enough

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  8. 11. pro 2019.

    A little video of said project (note, surprisingly high dynamic range in the audio)

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  9. 24. stu 2019.

    A sine beep distorted by flutter (unstable analog tape speed)

  10. 21. stu 2019.

    I'm not frustrated, it's called vim

  11. 20. stu 2019.

    Beautiful resampling artifacts

  12. 19. stu 2019.

    Context: I'm toying with flutter correction. At the moment I use linear interpolation when resampling, so it's noisy but otherwise it works well. It works on signals that contain single-frequency carriers; it uses one of them as a time base.

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  13. 16. stu 2019.

    I'm learning some linear algebra and finding fun signals applications for practice. Demodulated SSB voice contains information about the VFO error. You could tune it by ear, but you can also measure the frequencies of the 1st and 2nd harmonics and solve simultaneous equations:

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  14. 24. lis 2019.
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  15. 20. lis 2019.

    Bing preview of the Firefox installer exe

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  16. 14. lis 2019.

    Just playing with this “invisible marker” off eBay :)

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  17. 14. lis 2019.

    Things you find with a UV LED - a mystery triangle symbol on a bottle of isopropanol, filled with some fluorescent liquid

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  18. 4. lis 2019.

    Current project: RasPi & Airspy based field kit for signal strength measurements, with a wireless phone display, calibrated to dBm :)

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  19. 3. lis 2019.

    Text-mode S meter :)

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  20. 3. lis 2019.

    Measurements of RMS amplitudes seen by Airspy R2 with 440 MHz test signals of varying power and different settings of sensitivity gain (-g) for airspy_rx. Calibration data for a little signal mapping project.

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