MICARRAY – A SYSTEM FOR MULTICHANNEL AUDIO STREAMING OVER ETHERNET

Nowadays several commercial offtheshelf products for the use of multichannel audio data transmission over Ethernet are available. For certain applications these products have either technical limitations and/or they are too expensive. Therefore a highly flexible and cost efficient FPGA based data acquisition system has been developed. With this system it is possible to transmit 64 channels of sensor data at a resolution of 24 bits and an adjustable sampling frequency up to 192 kHz. To fulfill all of the technical requirements, the analog frontend was designed to support the IEPE standard. In this manner it is possible to drive a wide range of different sensor types, e.g. accelerometers, pressure sensors, force sensors, and microphones. Furthermore a smallsized microphone preamplifier for the operation of an omnidirectional back electret condenser microphone was designed and crafted. With the aid of these miniature microphone modules different array geometries can be realized.