Announcement: ATKStereoLimiter 1.0.0

I’m happy to announce the release of a stereo limiter based on the Audio Toolkit. They are available on Windows and OS X (min. 10.8) in different formats.

This stereo plugin limits both channels by getting the max of the instantaneous power of them and applying a limiting gain function on them. There is no oversampling inside the plugin, so the output signal can overshoot.

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On efficient reading and writing for large scale simulations

Last year, my colleagues and I presented a paper on giga model simulations in an SPE conference: Giga-Model Simulations In A Commercial Simulator – Challenges & Solutions. During this talk, we talked about the complexity of I/O for such simulations. We had ordered data as input that we needed to split in chunks to send them on the relevant MPI ranks, and then the same process was required for writing the results, gathering the chunks and then writing them down to the disk.

The central point is that some clusters have parallel file systems, and these works well when you try to access big blobs of aligned data. In fact, as they are the bottleneck of the whole system, you need to limit the number of accesses to what you actually require. For instance in HDF5, you can specify the alignment of datasets, so you can say that all HDF5 datasets will be aligned on the filesystem specifications (so for instance 1MB if your Lustre/GPFS has a chunk size of 1MB) and read or write chunks that are multiple of these values.

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Announcement: ATKSideChainCompressor 2.0.0 and ATKSideChainExpander 2.0.0

I’m happy to announce the update of the side-chain stereo compressor and expander based on the Audio Toolkit. They are available on Windows and OS X (min. 10.8) in different formats.

These stereo plugins can work on two channels, left/right or middle/side, possibly in linked mode (only one set of parameters), and can be set up to mix the input signal with the compressed signal (serial/parallel compression). The side chain channels can be used to steer the gain stage (the same setup will be used, right/left or middle/side), depending on the switch on the top right of the plugins. The same coloration stage than ATKColoredCompressor and ATKColoredExpander are used here.

This effectively makes ATKStereoCompressor obsolete, as the compressor can be set up in the same conditions as ATKStereoCompressor.

These new versions have more parameters than the previous ones, which means that the parameters used in a project with the former version won’t be loaded in the same way for these new versions.

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