1. An apparatus implementing a method of obtaining a signature for audio data, the method comprising: receiving at the apparatus audio data to be analyzed; determining at the apparatus a plurality of time domain features in said audio data; selecting at the apparatus a subset of said time domain features according to their position in the order of the magnitude or strength of the respective features; and generating at the apparatus a signature being descriptive, representative or characteristic for said audio data, wherein said signature is exclusively based on temporal positions of said subset of said time domain features.