SPARTA (Spatial Audio Real-Time Applications)

Spatial Audio Real-Time Applications (SPARTA) is a collection of VST/LV2 audio plug-ins for spatial audio production, reproduction and visualisation. Developed using JUCE and the Spatial_Audio_Framework.

This repository contains the following audio plug-ins:

• AmbiBIN - A binaural Ambisonic decoder (up to 10th order) with a built-in SOFA loader and head-tracking support via OSC messages. Includes: Least-Squares (LS), spatial re-sampling (SPR), time-alignment (TA), and magnitude least-squares (Mag-LS) decoding options.
• AmbiDEC - A frequency-dependent loudspeaker Ambisonic decoder (up to 10th order) with user specifiable loudspeaker directions (up to 128), which may be optionally imported via JSON configuration files. Includes: All-Round (AllRAD), Energy-Preserving (EPAD), Spatial (SAD), and Mode-Matching (MMD) Ambisonic decoding options. The loudspeaker signals may also be binauralised for headphone playback.
• AmbiDRC - A frequency-dependent dynamic range compressor for ambisonic signals (up to 10th order).
• AmbiENC - An Ambisonic encoder/panner (up to 10th order), with support for up to 128 input channels; the directions for which may also be imported via JSON configuration files.
• AmbiRoomSim - An Ambisonic encoder that also includes room reflections based on the image-source method using a shoebox room model. Multiple sources and multiple receivers are supported up to 128 channels (e.g. 32x 1st-order, 8x 3rd-order, or 2x 7th order receivers).
• Array2SH - A microphone array spatial encoder (up to 10th order), with presets for several commercially available A-format and higher-order microphone arrays. The plug-in can also present objective evaluation metrics for the currently selected configuration.
• Beamformer - A spherical harmonic domain beamforming plug-in with multiple beamforming strategies (up to 128 output beams).
• Binauraliser - A binaural panner (up to 128 input channels) with a built-in SOFA loader and head-tracking support via OSC messages.
• BinauraliserNF - Binauraliser, with the addition of proximity filtering for near field sound sources.
• DirASS - A sound-field visualiser based on re-assigning the energy of beamformers. This re-assignment is based on DoA estimates extracted from "spatially-constrained" regions, which are centred around each beamformer look-direction.
• MatrixConv - A basic matrix convolver with an optional partitioned convolution mode. The user need only specify the number of inputs and load the filters via a WAV file.
• MultiConv - A basic multi-channel convolver with an optional partitioned convolution mode. Unlike "MatrixConv", this plug-in does not perform any matrixing. Instead, each input channel is convolved with the respective filter; i.e. numInputs = numFilters = numOutputs.
• 6DoFconv - A time-varying partitioned convolution multi-channel convolver for SOFA files containing RIRs with multiple listener positions.
• Panner - A frequency-dependent 3-D panner using the VBAP method (up to 128 inputs and outputs).
• PitchShifter - A very basic multi-channel pitch shifter, based on the phase-vocoder approach.
• PowerMap - A sound-field visualisation plug-in based on Ambisonic signals as input (up to 10th order), with PWD/MVDR/MUSIC/Min-Norm options.
• Rotator - A flexible Ambisonic rotator (up to 10th order) with head-tracking support via OSC messages.
• SLDoA - A frequency-dependent sound-field visualiser (up to 10th order), based on depicting the direction-of-arrival (DoA) estimates derived from spatially localised active-intensity vectors. The low frequency estimates are shown with blue icons, mid-frequencies with green, and high-frequencies with red.
• Spreader - An arbitrary array (HRIRs, microphone array IRs, etc.) encoder with coherent and incoherent spreading modes.
• TrackerTest - A tool for outputting incoming headtracker data as audio signals.