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copied!<p>As others have noted, solving this problem using only raw spectrum analysis is a dauntingly hard problem, and you're unlikely to find a good solution to it. At best, you might be able to extract some of the vocals and a few extra crossover frequencies from the mix.</p> <p>However, if you can be more specific about the nature of the audio material you are working with here, you might be able to get a little bit further.</p> <p>In the worst case, your material would be normal mp3's of regular songs -- ie, a full band + vocalist. I have a feeling that this is the case you are probably looking at given the nature of your question.</p> <p>In the best case, you have access to the multitrack studio recordings and have at least a full mixdown and an instrumental track, in which case you could extract the vocal frequencies from the mix. You would do this by generating an impulse response from one of the tracks and applying it to the other.</p> <p>In the middle case, you are dealing with simple music which you could apply some sort of algorithm tuned to the parameters of the music to. For instance, if you are dealing with electronic music, you can use to your advantage the stereo width of the track to eliminate all mono elements (ie, basslines + kicks) to extract the vocals + other panned instruments, and then apply some type of filtering and spectrum analysis from there.</p> <p>In short, if you are planning on making an all-purpose algorithm to generate clean acapella cuts from arbitrary source material, you're probably biting off more than you can chew here. If you can specifically limit your source material, then you have a number of algorithms at your disposal depending on the nature of those sources.</p>

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