Linux-audio-announce August 2014

linux-audio-announce@lists.linuxaudio.org

11 participants
15 discussions

Silvet Note Transcription Vamp plugin v1.0 released

by Chris Cannam

Silvet is a Vamp plugin for note transcription in polyphonic music. http://code.soundsoftware.ac.uk/projects/silvet ** What does it do? Silvet listens to audio recordings of music and tries to work out what notes are being played. To use it, you need a Vamp plugin host (such as Sonic Visualiser). How to use the plugin will depend on the host you use, but in the case of Sonic Visualiser, you should load an audio file and then run Silvet Note Transcription from the Transform menu. This will add a note layer to your session with the transcription in it, which you can listen to or export as a MIDI file. ** How good is it? Silvet performs well for some recordings, but the range of music that works well is quite limited at this stage. Generally it works best with piano or acoustic instruments in solo or small-ensemble music. Silvet does not transcribe percussion and has a limited range of instrument support. It does not technically support vocals, although it will sometimes transcribe them anyway. You can usually expect the output to be reasonably informative and to bear some audible relationship to the actual notes, but you shouldn't expect to get something that can be directly converted to a readable score. For much rock/pop music in particular the results will be, at best, recognisable. To summarise: try it and see. ** Can it be used live? In theory it can, because the plugin is causal: it emits notes as it hears the audio. But it has to operate on long blocks of audio with a latency of many seconds, so although it will work with non-seekable streams, it isn't in practice responsive enough to use live. ** How does it work? Silvet uses the method described in "A Shift-Invariant Latent Variable Model for Automatic Music Transcription" by Emmanouil Benetos and Simon Dixon (Computer Music Journal, 2012). It uses probablistic latent-variable estimation to decompose a Constant-Q time-frequency matrix into note activations using a set of spectral templates learned from recordings of solo instruments. For a formal evaluation, please refer to the 2012 edition of MIREX, the Music Information Retrieval Evaluation Exchange, where the basic method implemented in Silvet formed the BD1, BD2 and BD3 submissions in the Multiple F0 Tracking task: http://www.music-ir.org/mirex/wiki/2012:Multiple_Fundamental_Frequency_Esti…

9 years, 8 months

Constant-Q library and Vamp plugin

by Chris Cannam

Announcing a new C++ library and Vamp plugin implementing the Constant-Q transform of a time-domain signal. https://code.soundsoftware.ac.uk/projects/constant-q-cpp The Constant-Q transform is a time-to-frequency-domain transform related to the short-time Fourier transform, but with output bins spaced logarithmically in frequency, rather than linearly. The output bins are therefore linearly spaced in terms of musical pitch. The Constant-Q is useful as a preliminary transform in various other methods such as note transcription and key estimation techniques. This library provides: * Forward transform: time-domain to complex Constant-Q bins * Forward spectrogram: time-domain to interpolated Constant-Q magnitude spectrogram * Inverse transform: complex Constant-Q bins to time domain The Vamp plugin provides: * Constant-Q magnitude spectrogram with high and low frequency extents defined in Hz * Constant-Q magnitude spectrogram with high and low frequency extents defined as MIDI pitch values * Pitch chromagram obtained by folding a Constant-Q spectrogram around into a single-octave range The code is provided with full source under a liberal licence, and plugin binaries are provided for Windows, OS/X, and Linux. The method is drawn from Christian Schörkhuber and Anssi Klapuri, "Constant-Q transform toolbox for music processing", SMC 2010. See the file CITATION for details. If you use this code in research work, please cite this paper.

9 years, 8 months

LV2 1.10.0 and friends

by David Robillard

Good news everyone! LV2 1.10.0 is out, along with enough parallel releases that I'm entirely too busy[1] to make a proper release email for each one. LV2 1.10.0 download: http://lv2plug.in/spec/lv2-1.10.0.tar.bz2 Cutting edge developers who go to all the best parties should note that the atom Object/Resource/Blank types have been merged and new code should use only Object (this simplification is not conceptually a compatibility breakage, but code explicitly using only Blank should be updated). Aside from this, there have been only minor improvements and additions since 1.8.0. Freshly prettified documentation and a full change log is available at http://lv2plug.in/ns/ Also check out the work-in-progress example-based LV2 book, "Programming LV2 Plugins" at http://lv2plug.in/book/ Related release announcements: http://drobilla.net/2014/08/08/jalv-1-4-6/ http://drobilla.net/2014/08/08/lilv-0-20-0/ http://drobilla.net/2014/08/08/suil-0-8-2/ http://drobilla.net/2014/08/08/sratom-0-4-6/ The RDF stack has also seen some updates: http://drobilla.net/2014/08/08/sord-0-12-2/ http://drobilla.net/2014/08/08/serd-0-20-0/ Enjoy, ~ Your friendly local neighbourhood benevolent dictator who clearly needs to automate the release process. [1] i.e. lazy, but "busy" makes me sound important, doesn't it? There could even be meetings involved. -- dr

9 years, 8 months

Hydrogen 0.9.6 released

by mauser＠smoors.de

Hi everyone, i'm happy to announce the final release of Hydrogen 0.9.6. I'm pretty sure that most of the users are already working with a 0.9.6-beta version, but here again is a small list of the most important changes in 0.9.6: * new build system (cmake) * add undo for song/pattern editor * jack-session support * jack-midi support * several bug fixes * tabbed interface * several small changes to the GUI * improve ExportSong add use of TimeLineBPM, RubberbandBatch processor and different types of resample interpolation The release can be downloaded via github: https://github.com/hydrogen-music/hydrogen/archive/0.9.6.tar.gz At this time, this is a linux-only release. Installers for Windows / OS X may follow in the future. Big thanks to all those wonderful people who made this release happen and who are keeping this project alive! Best regards, Sebastian

9 years, 8 months

amsynth 1.5.0

by Nick Dowell

amsynth 1.5.0 is now available, with a host of improvements and new features; - new filter modes: notch and bypass - new filter controls for key-tracking and velocity sensitivity - OSC2 octave range increased - ring modulation can now be dialled in (instead of on/off) - LFO can now be routed to OSC1, OSC2, or both - fixes an audible click when using fast filter attack times - note and controller events are now rendered sample-accurate when run as a plugin or JACK, fixing MIDI timing jitter - DSSI & LV2 plug-in builds can now load any preset by right-clicking the UI background - bank & preset loading is now faster Source code: https://github.com/nixxcode/amsynth/releases/download/release-1.5.0/amsynth… If you find any problems, please file a bug report @ http://code.google.com/p/amsynth/issues/list Thanks to all who have helped by providing suggestions and feedback. Nick

9 years, 8 months

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Linux-audio-announce August 2014