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Hardware Implementation for Audio Localization

Module by: Elizabeth Gregory, Joseph Cole

Summary: 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

Figure 1
The Microphones and the Circuit
The Microphones and the Circuit (figure13.JPG)

As shown in Figure 1, we used two electret microphones spaced 10 cm apart. Each microphone was amplified with identical non-inverting op-amp circuits (LM386), as shown in Figure 2. This circuit includes a low-voltage audio power amplifier and internal feedback with fixed gain.

Figure 2
The Microphone Amplifier Circuit
The Microphone Amplifier Circuit (figure14.jpg)

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