Release 2.0 for Max 6.1 and higher (32 & 64 bit) on Mac Os and Windows plateforms (Download).

Julien Colafrancesco, Pierre Guillot, Eliott Paris

Cblas, MaxSDK-6.1.4

The hoa.library in under the GNU Public License. If you'd like to avoid the restrictions of the GPL and use Hoa Library for a closed-source product, you contact the CICM.

• hoa.encoder~ encodes a signal in the circular harmonics domain depending on an order of decomposition and an angle.
• hoa.decoder~ decodes an ambisonic sound field for several loudspeakers configurations or for headphones. (eg. ambisonic | binaural | 5.1 | stereo ..)
• hoa.rotate~ applies a rotation on the ambisonic sound field.
• hoa.plug~ helps the modularization of patches for ambisonic processings.
• hoa.connect helps to connect the hoa externals together.
• hoa.dac~ makes easier the setting of the channels. It works like a dac~ object but you can use the matlab syntax to set the loudspeakers routing.
• hoa.pi is for people that never remember more than 4 decimals or want to initialize a good Pi number.
• hoa.pi~ is a signal version of the hoa.pi object
• hoa.scope~ displays the harmonics of an ambisonic sound field on a circle.
• hoa.projector~ discretizes the ambisonic sound field into an array of virtual microphones.
• hoa.recomposer~ recomposes a plane wave decomposition into circular harmonics and applies sound field transformations.
• hoa.recomposer is a GUI to manipulate virtual microphones and control sound field transformations.
• hoa.meter~ displays the peak levels for a circular array of loudspeakers. It computes and displays the energy and velocity vectors.
• hoa.gain~ is a GUI to control a multichannel gain
• hoa.record~ creates a sfrecord~ object with the best arguments to record of an ambisonic sound field.
• hoa.play~ creates an sfplay~ object with the best arguments to play of an ambisonic sound field.
• hoa.optim~ applies optimizations to the circular harmonics.
• hoa.map allows you to spatialize several sources on a plane.
• hoa.map~ is a tool that encodes several sources in the circular harmonics domain. It's easy to use and works with hoa.map.
• hoa.convolve~ uses time domain and frequency domain filtering to apply reveberation on harmonics dependant signals. The zero latency convolution is optimized with an algorithm based on the Gardner's one.
• hoa.wider~ can be used to wide the diffusion of a localised sound. The order depending signals are weighted and appear in a logarithmic way to have linear changes.
• hoa.freeverb~ is based on Schroeder/Moorer reverberation model that uses eight parallel comb filters and four cascaded allpass filters adapted to ambisonic domain.
• hoa.space allows you to draw spatial filtering and apply gains to the virtual microphones signals. It sould be used with the hoa.space~ object in the plane wave domain.
• hoa.space~ applies gains to the virtual microphones signal.
• hoa.vector~ displays the coordinates of the velocity vector and the energy vector that characterize a sound field. It's an useful tool to analyse restitution quality.

• hoa.am~ creates a diffuse soundfield by modulating the amplitude of the circular harmonics signals.
• hoa.delay~ allows you to delay the differents harmonics.
• hoa.decorrelation~ allows you to delay the differents harmonics depending on the harmonic number to decorrelate the harmonics and generate a diffuse sound field.
• hoa.grain~ synthesizes a diffuse sound field. It uses delay lines and amplitude modulation to create streams of grains. The parameters are scaled depending to the orders to generate a granular sound field.
• hoa.mirror~ applies a weight on the negatives harmonics to add the mirror image of a sound field to itself.
• hoa.mixer~ helps to understand ambisonics and the behavior of the circular harmonics.
• hoa.granular~ synthesizes a diffuse sound field. It uses delay lines and amplitude modulation to create streams of grains. The parameters are scaled depending on the orders to generate a granular sound field.

• hoa.convolve~ : Update buffer~ for Max 6 SDK and windows version (low)
• hoa.plug~ : Update dsp method for Max 6 SDK (low)
• hoa.decoder~ : Find a solution for attributes order (low)
• hoa.spectrum~ : Clean (medium)
• hoa.boids : Clean (medium)
• hoa.recomposer : No fisheye preview on window
• hoa.freeverb~ : click on audio on/off
• fftw for window