Processing audio data for producing metadata and determining aconfidence value based on a major or minor key

摘要

Systems and methods for producing a measure of tonality operating by sampling audio data and determining the difference in a confidence value for a major key or a minor key. A summing function produces a weighted confidence value. Systems and methods also provide an indication of the rate of change or amount of change between major and minor tonality within music. The weighted tonality may be using chords. A signal asserted from a system embodying the invention is intended to be used to control studio equipment such as lighting or camera equipment according to a weighted tonality.