[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)