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Variable Room Acoustics System
The Variable Room Acoustics System (VRAS) is a multichannel room acoustic enhancement which was developed at IRL during the 1990s. It achieves reverberation gain using a regenerative system which places a multichannel reverberator between the system microphones and loudspeakers.
This means that the reverberation time in the room can be increased by increasing the reverberation time of the digital reverberator, without having to increase the loop gain. VRAS produces significantly higher reverberation gains than previous regenerative systems, and with negligible colouration artefacts.
The digital reverberator used in VRAS is a special design that has a unitary property. The power gain of the reverberator is constant with frequency and so does not increase the fluctuations in loop gain when inserted into a regenerative sound system. Therefore colouration artefacts are reduced compared to non-unitary designs.
The second component of VRAS is its early reflection (ER) system. This is an in-line system that generates early reflections for sound sources in the stage area, using microphones close to the stage. The VRAS early reflection system also uses a unitary reflection processor to minimise the risk of colouration artefacts.
Variable Room Acoustics System
VRAS is protected by three international patents. VRAS was licensed to Level Control Systems (LCS), USA, in 1997 and the system has been installed in over 40 venues around the world including churches, theatres, homes and music practice rooms.
LCS LX-300 Processor
In 2005 LCS was acquired by Meyer Sound Laboratories, and VRAS became the basis of the Meyer Constellation system .