![]() ![]() So it saves data by not using these freqencies, something an unaware listener wouldn't notice anyway. This is also because the human hearing range, which spans from 20hz to 20khz at birth, can be affected by noise-induced hearing loss open in new window and/or age open in new window which leads some people to lose hearing in frequencies above 15khz gradually with time. This is a common technique for lossy formats to save on data as these high frequencies aren’t as important for the overall sound reproduction. The biggest difference between the two graphs is the frequency cut off at the top of the graph of the lossy format.This screenshot shows the same song with the top graph being a WAVE file and the bottom graph being an OGG file export of the same WAVE file. This tool shows the time of the song from left to right, the frequencies from lowest at the bottom to highest at the top and the loudness of the frequencies in color (legend to the right). The best way to check for source quality and quality loss is using Spek open in new window, a free acoustic spectrum analyser tool: Save your own lossless WAV(E) files when doing edits, at each step, so you always have a lossless source to continue editing from without having to redo everything from the start.
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