[HN Gopher] Visual Morphology of Vowels ___________________________________________________________________ Visual Morphology of Vowels Author : ssgh Score : 4 points Date : 2022-10-29 02:24 UTC (20 hours ago) (HTM) web link (github.com) (TXT) w3m dump (github.com) | ssgh wrote: | I've been casually researching visualisations of sound for 2 | years now, and recently came across another interesting | discovery, and wanted to share it. | | It slightly improves the way ACF images are presented, but this | small improvement makes a big difference. It works best on "small | sounds" that last 1-2 sec, such as vowels or sample recordings of | flute, violin and so on. The sound is analysed with FFT with the | sliding window of 1/4 sec that advances by 1/500 sec at a time | until it covers the entire waveform. After computing FFT spectrum | for each frame, a basic bandpass filter is applied to separate | high and low frequencies. The result is fed to the inverse FFT, | thus computing ACF, and presented in polar coordinates using a | basic red-blue color scheme. The effect is that low frequencies | appear red and high frequencies appear blue. | | To my surprise, this basic method reveals a large variety of | distinctive, yet visually appealing, shapes for vowel sounds. ___________________________________________________________________ (page generated 2022-10-29 23:00 UTC)