The non-annotated spherical harmonics are used in higher order implementations of Ambisonics, in this case First Order is perfectly adequate. Image from Wikipedia and quickly annotated. Cartesian AxesĪnd on these axes we can see how the virtual microphones obtained from the spherical harmonics look. X, Y, and Z are figure-8 microphones, so they capture particle velocity.įrom the frame of reference of the microphone, X is straight ahead, Y goes to the left, and Z goes up. W is an omnidirectional microphone, and therefore it captures pressure.
The SPARTA plugins actually support both, but I think it would be better to be consistent.Īs already mentioned, we should also make sure that they are in the same sampling rate as everything else, which is already the case with the IRs for the York Minster.ģ.1 Brief aside: meaning of Ambisonics channelsĪmbisonics works with Spherical Harmonics, but without getting boggled into the mathematics, we can instead use an equivalent microphone model. Most modern plugins assume the Ambix (Ambisonics eXchange) format, whose channel ordering is WYZX.
The first thing we must notice is that they are provided in Furse-Malham (FUMA) format, whose channel order is WXYZ. In order to perform a useful comparison, I'm using the impulse responses from the York Minster, because they have both the B-format and the stereo data.
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Here are the original song and its binauralizationīinauralized song, click here to download The Sparta plugins support both 44.1 and 48kHz, but it's probably better to just pick one sampling frequency and stick to that (including in the project settings), in order to avoid mistakes. The binauraliser works by convolving with HRTFs and interpolating between them. In the binauraliser plugin itself I've only selected the Stereo preset, which already has the correct angles To achieve this, I just take the original file and pass it through the SPARTA binauraliser. This is just the original song with a binauralization, so that the two channels arrive to the listener from +-30°
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I'm going to use Plogue Bidule and Adobe Audition, with some free VST plugins: AF - Binaural Workflow Binauralization Workflow
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