Worth noting, the play-thru functionality found SoundSource 3 was removed from versions 4 and up. SoundSource now includes the ability to control audio on per-application basis, and add effects to any audio. With this update, the app grew into a fully-featured system-wide audio control utility. You can see it in this paper: (March 26th, 2019): Just over two years later, we released an overhauled SoundSource 4. We have built a 32-speaker super-small spherical source, which works well up to the 4 kHz octave band. Then you need a perfectly omnidirectional sound source, a dodechaedron simply sucks above 1 kHz, witch significant lobes which can disrupt the values of LF significantly. Perhaps the new Octomic could be a reasonable compromise, and it is still factory-calibrated one by one. But the Eigenmike is very expensive (20k Euros). This is quite reliable, a first order Ambisonics microphone is never so good. However, we are using an Eigenmike, and we calibrate it every year. The concept of LF is simple and reliable, in facts it works very well in simulation software, such as Catt, Odeon or Ramsete.ĭefinitely a Tetramic is a wise choice, as they are factory-calibrated one by one, so at least for 6 months - one year after purchase the pressure and velocity responses should stay matched. I warmly suggest that you find and install the very old Audition 1.5, which runs perfectly fine on a Mac using Playonmac. Hence we can conclude that, if you are on a Mac and hence forced to use the old version 2.0.0 of Audacity, you cannot rely on the Aurora Acoustical Parameters plugin for computing correctly these spatial parameters. Here instead processing the same Ambisonics FuMa impulse response with the old good Audition 1.5 and Aurora plugins in XFM format:Īs you can see comparing the two images, the values of these spatial parameters computed in Audacity 2.0.0 are completely wrong, while those computed by the Audition version of Aurora are perfectly reasonable. Here an example of computing "spatial parameters" Jlf, Jlfc and Lj with Aurora for Audacity 2.0.0: If the alignment was wrong, you can fix it using a free rotator plugin, such as IEM Scene Rotator, and using O3A Flare for checking that the alignment is correct. So first convert your impulse response to Fuma B-format, then open it with Audacity and use Acoustical Parameters for computing Jlf.Ī correct measurement requires that the X axis of the microphone was pointing exactly to the omnidirectional sound source. You should analyze the B-format impulse response, in Fuma format (not Ambix). Said that, the Aurora Acoustical Parameters module can compute Jlf, Jlfc and Lj. You know that these spatial parameters are quite unreliable, do you know? Now you can cut short just the portion of the linear IR you need, and export it to a single 4-channels WAV file (of course this 4-channels export is possible only after having disabled the stupid option to downmix to stereo which Audition sets by default). Select "full Autorange and presse Calculate! The result will be 4 new mono tracks, containing the deconvolved impulse responses. Now you invoke the Aurora Convolver, drag the A-format channels to Data and the invesweep to Filters, and select the "one for All", forcing this single inverse filter to be applied to all 4 input channels: Regrading convolution, after recording your 4-channels sweep from the microphones, and imported also the invsweep, your situation will be something like this: Of course you need to use the Aurora modules fopr version 2.0.0. The password for unzipping the ASIO-enabled executable (which you should copy over the standard version executable) is just my name. In your case, as you record a synchronous recording of 4 channels, better to switch back to version 2.0.0, for which we made available the ASIO-enabled version.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |