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AssigneeJohannes Kepler UniversitäT Linz
InventorTim Pohle
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A method of deriving information from an audio track, or a part thereof, wherein onsets or intensity/amplitude variations are detected as well as at which frequencies (timbral frequencies) or in which frequency bands these occur. Especially interesting is the frequency of such onsets. In this manner, the frequency of beats of a low frequency drum may be separated from that of onsets of a higher frequency drum or guitar of other instrument, and these frequencies provide important information about the track, such as genre, beat, etc. Naturally, parameters may be provided relating to the individual frequencies (frequency of onsets and frequency/tone of the sound of the onsets), or a fit thereto may be used to reduce the number of parameters. It is noted that the frequencies in which the onsets are determined may be tones or half tones in the relevant scale. As onsets of instruments normally are whole multiples of a basic frequency or beat, it has been found advantageous to represent the individual frequencies on a logarithmic scale so that such multiples of frequencies are equidistant and so that transposing to higher or lower beats is very easy.
A method of deriving information from an audio track, the method comprising the steps of:
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An apparatus for deriving information from an audio track, the apparatus comprising:
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A data storage comprising a plurality of groups of information each group of information relating to an audio track and to one or more second frequencies of amplitude/intensity variations exceeding a predetermined value/percentage within one or more first frequencies/frequency bands of the pertaining audio track, the information being represented as an at least one-dimensional representation along at least one axis, the points in time or second frequencies being represented along one of the axes on a non-linear scale.
Dependencies are inferred from the claim text.