3 replies to this topic

[mentatpsi]

I was wondering... does anyone know how music players' visualization features work? What aspects of the music does it process? Thanks in advance .

[Brainbox]

I'm not very familiar with the algorithms that are used specifically.

But you might want to investigate FFT (Fast Fourier Transform). Fourier transform algorithms in general are able to convert any signal in the time domain representation into a frequency domain representation. This means that using it on an audio stream, it would be possible to generate amplitude information for certain frequencies or frequency bands. Like a spectrum analyser, or analogous to a setup with filters for several frequency bands.

Using this information in digital form, it would be possible to trigger visual effects, e.g. alternating colour scheme's depending on the frequencies and amplitudes used by the music, or more complex things.

But, like I mentioned, I'm not familiar with this particular subject, but at least, FFT would enable you to generate frequency dependant visual effects, but it's either overkill or ideal. You choose

[mentatpsi]

I'm not very familiar with the algorithms that are used specifically.

But you might want to investigate FFT (Fast Fourier Transform). Fourier transform algorithms in general are able to convert any signal in the time domain representation into a frequency domain representation. This means that using it on an audio stream, it would be possible to generate amplitude information for certain frequencies or frequency bands. Like a spectrum analyser, or analogous to a setup with filters for several frequency bands.

Using this information in digital form, it would be possible to trigger visual effects, e.g. alternating colour scheme's depending on the frequencies and amplitudes used by the music, or more complex things.

But, like I mentioned, I'm not familiar with this particular subject, but at least, FFT would enable you to generate frequency dependant visual effects, but it's either overkill or ideal. You choose

ya i was thinking about it one day, and thought to myself how i would do it given knowledge of that level of program interfacing. I thought to myself the most efficient way to do it was with amplitude of different frequencies, since a couple of them could be associated with different emotions. I know there are also algorithms that can figure out general mood of the song, so with that one could easily use that to give the color of the piece.

I'll go look up the information you provided, sounds pretty interesting . Thanks

[mike09]

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Edited by mike09, 14 August 2008 - 05:38 PM.