# 0.2 Design decisions for audio localization implementation

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In this section, we will go over the design decisions we had to make in the course of our project, including determining how many microphones we should use, as well as the spacing of the array.

With the theory out of the way, we have to face the real world and set more constraints.

## The number of microphones

In this project, we are using the TI TMS320C6211 DSK board. This board has two channels that sample at 48 kHz and anotherchannel that samples at 8 kHz. Since we are not interpolating our signals, the sampling frequency is increasingly critical,so we can only use two microphones . shows what happens to the beampattern when we use reduced sampling frequency.

## Array spacing

In order to find the best array spacing (theoretically), we have to go through a few calculations. In our most extremecase, the signals will be hitting our array from 180°. This gives us perfect destructive interference, as our phasedifference will be $\pi$ . Therefore, we only need half of the wavelength:

$d=\frac{\lambda }{2}$
We can find λ by dividing the frequency of our sine wave (500 Hz) by the speed of sound (346.287 m/s):
$\lambda =\frac{c}{f}=\frac{346.287}{500}=0.69$
and our array spacing $d$ ends up being 0.345 m.

Introduction about quantum dots in nanotechnology
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absolutely yes
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for teaching engĺish at school how nano technology help us
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or in general
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in general
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