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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)pic.twitter.com/WWwAMAc6NO
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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")pic.twitter.com/XZ2T13MNzA
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Experimental command-line SSTV decoder used with iTerm2's imgcatpic.twitter.com/MI4LkSi0ac
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Another one based on Chu et al. (2002): Detailed Directivity of Sound Fields Around Human Talkerspic.twitter.com/n44Cz5Ts5R
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Reading fascinating research papers at 2am again. Here's one about the frequency-dependent directivity of the human voice. https://www.researchgate.net/publication/236213215_Directivity_measurements_of_the_singing_voice …pic.twitter.com/2vqO9e31xq
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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. https://www.semanticscholar.org/paper/The-CIPIC-HRTF-database-Algazi-Duda/7dabd56ccd524f78f0eda5073dc358f28893a45d …pic.twitter.com/2ZtX8UXQWu
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Doppler effect emerges when the acoustic path tracing update rate is high enoughpic.twitter.com/Br0GRAq1Zk
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A little video of said project (note, surprisingly high dynamic range in the audio)https://www.youtube.com/watch?v=K61M1dL1fmU …
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A sine beep distorted by flutter (unstable analog tape speed)pic.twitter.com/6xgBc87S4D
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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.pic.twitter.com/9A1u4R9LOz
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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:pic.twitter.com/SJm6n42oqu
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Things you find with a UV LED - a mystery triangle symbol on a bottle of isopropanol, filled with some fluorescent liquidpic.twitter.com/3w8YR4ZGxO
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Current project: RasPi & Airspy based field kit for signal strength measurements, with a wireless phone display, calibrated to dBm :)pic.twitter.com/8iYlCbJM2O
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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.pic.twitter.com/8EAOcsVbRM
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