| Solutions based on digital acoustics |
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Digital Acoustics makes possible new solutions to the real world challenges of sound engineers, acousticians and sound systems designers. High Spatial ResolutionHigh Spatial Resolution (HSR) is the spatial equivalent for high temporal resolution, which is also called High Fidelity (HiFi). High Fidelity aims at recording sound precisely, including the least audible details, i.e. within a wide frequency band. Similarly, HSR aims at accurately recording the spatial characteristics of a sound environment.  
Spatial resolution is directly connected to the angular selectivity of directivity patterns. Whereas temporal resolution is characterized by the frequency, spatial resolution is characterized by the "spatial frequency", which is also called the order The higher the order is, the higher spatial resolution is: Trinnov Audio has developed the HSR technology to overcome some limitations of current spatial audio systems. Thanks to our unique research about both acoustic field capture and restitution, it is possible to extract more efficiently the least spatial information that any microphone array can get and to compute more efficient signals to feed any loudspeaker array. Trinnov Audio's Surround Recording Platform delivers directivities up to order 5. Both figures below represent the most selective directivity achievable using 1st and 5th order.
For more information, please read our White Paper about HSR. Spatial RemappingSpatial Remapping is a technology to adapt multichannel sound on any loudspeaker layout. An optimal reproduction of multichannel sound is obtained only if the loudspeakers are arranged in the listening room according the ITU recommendation, where the center speaker is at 0?, the left and right speakers are at +/-30? and the surround speakers are at +/-110?. Unfortunately, this recommendation is incompatible with many listening situations such as homes or location recordings. The ITU recommendation has been developer to overcome a limitation of mulichannel sound, where the spatial environment is described by a mean to reproduce it: loudspeaker at predefined positions and channels to feed them. If the loudspeakers are not at their correct places, the reproduction is incorrect. The Spatial Remapping technology overcomes this limitation of multichannel by providing correct imaging on any reasonable speaker arrangement. The remapping principle is illustrated below:
 - During a radiation step, a unique acoustic field is associated to the discrete multichannel signals. The radiation is a linear process recreating the acoustic field produced by ideal loudspeaker perfectly respecting a predefined loudspeaker layout such as ITU recommendation. The radiation process provides the Fourier-Bessel coefficients of the acoustic field resulting from the mutual contribution and interaction of all the channels. This is a very powerful step as the acoustic field representation is independent of the original multichannel format and the loudspeaker layout. - During the decoding step, optimal loudspeaker feeds are derived from the acoustic field according to the Spatial Replay method. In the Optimizer, the remapping technology is fully automated thanks to a 3D acoustic probe measuring the actual 3D positions of the loudspeakers. The distance is evaluated within 1cm from the propagation time for the wave front emitted by the loudspeaker to reach the 3D acoustic probe. The angles (azimuth and elevation) are measured with less than 2? error from the analysis of the orientation of the wave front crossing the 3D acoustic probe.
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