Linux-audio-dev November 2022

linux-audio-dev@lists.linuxaudio.org

8 participants
8 discussions

stereospread.lv2 - Stereo spreading plugin (conjugate random phase all-pass filter pair)

by Florian Paul Schmidt

Hi, I wrote a small plugin for spreading mono content to stereo and I would like to receive some feedback on it from people more knowledgable in DSP matters than me. It has one nice property: It spreads the signal over the spectrum by way of a conjugate pair of random phase all-pass filters, and since it's a conjugate pair it sums back to unity when down-mixing to mono. So, no ugly comb filter effects like when downmixing a Haas-expanded signal. https://github.com/fps/stereospread.lv2 The page has an example sound.. How it works: It's actually rather simple: 1. create a vector of random phases (matlab notation): filter_length = 1000; spread = pi; hfft1 = exp(-1i*(spread*rand(filter_length,1) - spread/2)); And for the second filter just take the complex conjugate: hfft2 = conj(hfft1); This ensures that what is a phase theta in the first filter becomes a phase of -theta in the second filter, and summed that just gives a phase of 0. 2. Then assemble the coefficients such that it corresponds to a fft of a real signal and do the inverse fft (possibly I have a small error here which i needed to fix with the 'symmetric' flag in matlab): f1 = ifft([1; hfft1; conj(hfft1((end-1):-1:1))], 'symmetric'); f2 = ifft([1; hfft2; conj(hfft2((end-1):-1:1))], 'symmetric'); 3. The two IRs f1 and f2 implement the pair of filters and can be applied via convolution (which the above plugin does). It seems to be possible with little ill effect to reduce the length of the filter down to a size of 50 samples or so by just cutting it off before the convolution. What do you think? Kind regards, FPS -- https://dfdx.eu

6 months, 2 weeks

I'm being stalked, please be weary

by Jeanette C.

Hey hey, I am being stalked and the stalker has already contacted people I am connected with. Please, if anyone contacts you with any request, be weary. It's a plain name gmail address. Thank you and sorry to bother you! Best wishes, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c Do you even know what I like Just what I'm living for, What I adore <3 (Britney Spears)

7 months, 2 weeks

[Announce] FFADO version 2.4.7

by Jonathan Woithe

The FFADO project announces the availability of FFADO version 2.4.7. This is a bug-fix release to address issues encountered since version 2.4.6. This is a source-only release: libffado-2.4.7.tgz. Changes since FFADO 2.4.6: * Address additional type-related issues encounted in ffado-mixer when using python 3.10. Components affected were the crossbar router and the M-Audio device mixer. * Update config.guess to the latest version. This supports newer architectures such as RISCV64. * Address compiler warnings reported by newer versions of gcc. * Add a configuration entry for the Apogee Duet. Thanks to those who have helped with this release, including Salvador O.G., Letu Ren, Nils Philippsen and Greg Dorian. Jonathan Woithe (on behalf of ffado.org)

1 year

SoundTracker 1.0.3 released

by Yury Alyaev

Hi all, Finally I have released SoundTracker v1.0.3. Comparing to the last pre-release, 1.0.3-pre2, this is only the bugfixing release with few small improvements only. Here are main features of the 1.0.3 release comparing to 1.0.2: * General: - Indication of the current playing instrument / sample number in scopes (optional via Settings) - Extended pattern sequence editor with DND (activaled by right-click on the playlist area) - Quick instrument selection * Track editor: - Track line insertion / removal - Masking for cut / copy / paste operations (also the contents of CCP buffers can be inspected) * Instrument editor: - Envelopes cutting / copying / pasting / scaling - Indication of the keys playing with the current instrument also in the pattern / song playing mode * Sample editor: - Automatic Gain Control sample processing procedure - Selection from loop and to the left / right of the exising selection - Optional loop playback when playing selection - Waveform value indication - Loop Facility, an advanced tool for manipulations with sample loops You can find more new features in NEWS file. SoundTracker download page: https://sourceforge.net/projects/soundtracker/files/ Regards, Yury.

1 year

[LAA] XUiDesigner v0.9 released

by Hermann Meyer

XUiDesigner v0.9 A easy to use tool to generator/design X11 based LV2 Plugin Bundles by drag n' drop, released under the BSD Zero Clause License. Beside that XUiDesigner allow to generate and install GUI's for existing LV2 plugins (so far only Reaper fail to load extra UI's), it support as well to generate LV2 plugins from scratch. Special support is implemented for FAUST dsp files, which allow you to generate a LV2 plugin with X11 based UI by just drag'n'drop a FAUST dsp file into the XUiDesigner interface. This works now as well for MIDI capable faust modules. In any way, you don't need to interference with any of the annoying LV2 implementations. XUiDesigner handle that all for you. The very same is true when you like to implement your own dsp (C++) into a LV2 plugin. Example files for how to create a c++ file for parsing (drag n' drop) with XUiDesigner been included. For later rework the UI a json file will be created which you could drop later on XUiDesigner to load and rework the UI. This may also be usable by other toolkits to create a UI? This release comes with a couple of Bug-fixes and aims to be nearly stable. Here is a introduction Wiki <https://github.com/brummer10/XUiDesigner/wiki/XUiDesigner> entry to show the first steps. Note: Please download the attached XUIDesigner_0.9.tar.gz <https://github.com/brummer10/XUiDesigner/releases/download/v0.8/XUIDesigner…> archive, as only that contain the needed git submodule ( old long time knowing bug on github) as the other files wont be able to build XUiDesigner for you. New in this release: Fix read multiple frames from json file <https://github.com/brummer10/XUiDesigner/commit/acc04705301c776b16a8a0fa679…> Make image file path relative for json read/write <https://github.com/brummer10/XUiDesigner/commit/1f873f2a2384ba3b32986b8a36f…> add missing json values <https://github.com/brummer10/XUiDesigner/commit/79d16eccfa59efe6f944e736dd3…> Load lv2 world in parallel thread on start up <https://github.com/brummer10/XUiDesigner/commit/ef794397d20ec73b03ba1146ce2…> make file dialog window bigger on default <https://github.com/brummer10/XUiDesigner/commit/0ca97a6cf7de9b40e8a03bcbc04…> Update libxputty fix linker issue <https://github.com/brummer10/XUiDesigner/commit/a11b7dcfc46bf8309fc044b2d3c…> Fix parse *.cc files without bypass port <https://github.com/brummer10/XUiDesigner/commit/716dc16302e2c3bb72029c70dfa…> Project page: https://github.com/brummer10/XUiDesigner Download Release: https://github.com/brummer10/XUiDesigner/releases/download/v0.9/XUIDesigner… regards hermann

1 year

B.Choppr 1.12.0 - New chop panning

by Sven Jaehnichen

Hi, there's a new release of B.Choppr, after a longer break. B.Choppr is an LV2 audio plugins that cuts the audio stream into chops of defined sized. You can change the level and *NEW* the panning for each chop to create crazy effects. Github: https://github.com/sjaehn/BChoppr Release: https://github.com/sjaehn/BChoppr/releases/tag/1.12.0 Have fun Sven

1 year

relative_dynamics.lv2

by Florian Paul Schmidt

Hi, this is another "weird" plugin which I finally found the time to implement. It's a dynamics processor that doesn't care about absolute thresholds. It just computes two envelopes, env1 and env2, filtered with exponential smoothing filters with different time constants t1 and t2 (usually t1 < t2). Their ratio r is computed and the audio signal is then multiplied by 1/r. https://github.com/fps/relative_dynamics.lv2 Some additional controls (clamping of the resulting factor and optional delaying of the original audio relative to the envelopes) are provided for fun and profit.. Kind regards, FPS -- https://dfdx.eu

1 year

PAW Website and Registration Form is Ready!

by Stéphane Letz

The Programmable Audio Workshop (PAW: https://paw.grame.fr/) is a yearly one day event gathering members of the programmable audio community around scientific talks and hands-on workshops. The 2022 edition of PAW will be hosted by the INRIA/INSA/GRAME-CNCM Emeraude Team at the CITI Lab of INSA Lyon (France) on December 3d, 2022. The theme of PAW this year is "Networked and Embedded Audio Systems" with a strong focus on spatial audio and Field-Programmable Gate Arrays (FPGAs). Registration form here: https://docs.google.com/forms/d/e/1FAIpQLScJAyoREj0HJkoENLQb1OfpZpQe8f5_taU… Stéphane for the PAW team

1 year

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Linux-audio-dev November 2022