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MIAUDIO—Audio Mixture Digital Matrix

Electroacoustic music is turning more and more to the sound diffusion techniques. Multichannel sound systems like BEAST and SARC are built so that the musician can independently control the intensity of several audio channels. This feature provides the possibility of creating several sound diffusion scenarios, i.e., immersion and the possibility of movement around the audience. The developed system (MIAUDIO) is a real-time sound diffusion system currently able to mix up to 8 audio input channels through 32 outputs channels. A hardware solution was adopted using a Field Programmable Gate Array (FPGA) to perform the mixture. The analogue audio signals are conditioned, converted to digital format by several analogue-to-digital converters and then sent to the FPGA that is responsible to perform the mixing algorithm. The host computer connects to the FPGA via USB and is responsible for supplying the parameters that define the audio mixture. Being so, the user has control over the input levels through the output channels independently. MIAUDIO was successfully implemented with a low-cost solution when compared with similar systems. All the channels were tested using a Precision One system with very good results.

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