Hardware Implementation for Audio Localization 1.2 2004/12/15 10:05:48 US/Central 2004/12/15 15:33:53.334 US/Central Elizabeth Gregory lizzardg@rice.edu Joseph Cole joecole@rice.edu Elizabeth Gregory lizzardg@rice.edu Joseph Cole joecole@rice.edu beamforming hardware microphone TMS320C6211 In this section, we will go over the hardware implementation, including the TI TMS320C6211 DSK Board features and the microphone array.

TI TMS320C6211 DSK Board You can find a description of the board on the TI website. To receive the signals, we decided to use the McBSP1 receive interrupt so we could read the values from our two 16 bit channels simultaneously.

Microphone Array

The Microphones and the Circuit

As shown in , we used two electret microphones spaced 10 cm apart. Each microphone was amplified with identical non-inverting op-amp circuits (LM386), as shown in . This circuit includes a low-voltage audio power amplifier and internal feedback with fixed gain.

The Microphone Amplifier Circuit