Compare two audio files for beat/tempo and rating in iphone

[vadivelu]

Hello,

I want to develop an iPhone application which should have the ability to count the number of phrases that are received when user sing on the mic.

This application should also have the ability to decipher whether the users phrases are in, or out, of cadence with a preset beat. When user sings on mic, Instrumental-only music plays.

So I have to merge the users recorded voice with instrumental music -- this is one audio file. Already i have on original song file. I have to compare both and give a rating to users.

Note...Instrumental music is without vocal of Original Song file.

Can anyone please help me?
Thanks,
Vadivelu

[Stewart Ross]

Sorry, but what you ask is well beyond what any of us can help you with.

There are commercial applications such as Sony Soundforge which have had many person-years of development, and these can perform sophisticated time/pitch/beat transforms on audio sources. Even so, they don't do the kind of analysis you are asking,which in my opinion is way beyond what would be expected of a phone app.

To achieve what you have asked you will need to do a lot of research for yourself, including looking at how the commercial apps do similar tasks. We can't do it for you.

-Stewart