Download A Statistical Approach to Automated Offline Dynamic Processing in the Audio Mastering Process Mastering audio is a complicated yet important step in music production. It is used for many purposes, an important one is to ensure a typical loudness for a piece of music within its genre. In order to automate this step we use a statistical model of the dynamic section. To allow a statistical approach we need to introduce some modifications to the compressor’s side-chain or more precisely to its ballistics. We then develop an offline framework to determine compressor parameters for the music at hand such that the signal’s statistic properties meet certain target properties, namely statistical central moments, which for example can be chosen genre specific. Finally the overall system is tested with songs which are available to us as unmastered, professionally mastered, and only compressed versions.
Download Low Frequency Group Delay Equalization of Vented Boxes using Digital Correction Filters In this paper methods to determine the group delay of vented boxes and techniques for the design of filters for group delay equalization are presented. First the transfer function and the related group delay are explained. Then it is shown how the group delay can be computed or approximated for a certain alignment of the box. Furthermore it is shown how to derive the required parameters of the transfer function from a simple electrical measurement of the box, which allows the determination of the group delay without knowledge of the box design parameters. Two strategies for the design and implementation of digital correction filters are shown where one approach allows for a real-time adjustability of the delay. Finally, the performance with a real speaker is evaluated.