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Why do ARSS and all audio to spectrogram then back to audio program's create audio files that sound muffled? I know their is some physics and math with the short-time Fourier transform and etc. I would appreciate if someone could explain why this muffled sound happens, even at high resolutions and a large number of pixels per hertz and pixels per second with also a large frequency range.

In additions, is their a pdf/textbook that goes deep into Spectrograms and why they act a certain way and the math behind it? I know it might be in a book about signal processing as a whole, but I really want to dive deep into spectrograms and their behavior.

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