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kareoke machine with frequency filter

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Shy&Corine

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hey everyone,
wer working on a project for school where we are trying to build some sort of karaoke machine where you have 2 sound inputs, one of the music that is playing and one of the mic of a person singing. we want to compare the frequencies of the 2 sound inputs and we were thinking of doing it with some sort of frequency filter, but we have no idea how to make one and wer having trouble finding any ideas on the internet. we want some kind of score to appear when the 2 sound inputs coincide to see if the person singing can sing with the right frequencies. all the help you can give us is welcome.
sorry if we are not exactly using the right terms, we dont get physics in english.
thanks in advance
 
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