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Background of our topic.

Current d/a methods

Remember that there are many uses for D/A conversion, not just audio reproduction, so different methods are used for different practical applications. One of the most frequently used methods in industry is D/A converters that oversample or interpolate. Oversampling is where one samples a signal at a much higher frequency than is specified by the Nyquist rate. This means that it samples much more often than at twice the bandwidth of a signal. This oversampling usually result in effectively shifting the noise present in the important low frequencies into high frequencies which can then easily be low pass filtered. This results in D/A converters with high resolution and low cost. Another commonly used type, and the one that most closely reflects what we chose in our project, is a binary-weighted D/A converter. This type has more focus on hardware implications, rather than the software implications of the oversampling mentioned earlier. Binary-weighted D/A converters require components that take each of the bits entering the converter to a summing point where they add up to an accurate Vout value. The disadvantage to this method is that the D/A converter is inaccurate due to the individual tolerances of the components. A subcategory of this converter type is an R/2R ladder, that has resistor values of R and 2R for each of the input bit streams. This fixes the accuracy problem for low resolution converters since it is simple to find resistors of these R/2R values.

What is a beaglebone black?

The BeagleBone Black

The BeagleBone Black is a single-board embedded computer that is made with open source software and hardware for developmental purposes. For our project, we were provided a BeagleBone Black by the Department of Electrical and Computer Engineering at Rice University, but it is much cheaper than a full-fledged computer. Its processing power and storage space are much smaller, but if one plugged in an HDMI to a monitor and a USB to a keyboard, it can seem like a real computer running Linux. There are 46 total I/O pins but many of them are reserved for special uses, so only approximately 30 of them are general purpose I/O. With the processor speed and I/O count in mind, we chose our design to rely on using 8 pins and therefore 8 bits. Also note that the audio files we stored on the BeagleBone Black have exactly a 44.1kHz sampling rate.

Questions & Answers

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
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 to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Elec 301 projects fall 2014. OpenStax CNX. Jan 09, 2015 Download for free at http://legacy.cnx.org/content/col11734/1.2
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