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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.

Beampattern with 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 . Therefore, we only need half of the wavelength:

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

Questions & Answers

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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