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Connection between audio and video

A webcam will videotape the paper and stick movement; then, a computer will process the images to determine the drum stick positions. Once the microphone detects the audio signal created by the player hitting the drums on the paper, the visual information showing the current position of the drum stick is used to generate the correct sounds.

Reduce processing delay

Whether the stick hits the paper or not, we processed the snapshots and saved the current stick location in an array. Only when the stick hits the paper, which is detected by the impulse from the microphone, we took out the position information to generate the correct sounds.

Sound division

Below is how we divide our paper. Each part corresponds to a unique sound. In total there are four parts. The stick position determines which sound to play by the computer.

Playing different sounds

i=0; playing=0;sample_rate_devider=3; while(1==1)i = i+1; if (sample_rate_devider==3)hitPosition = tracking(vidobj,edgePosition); sample_rate_devider=0;endsample_rate_devider=sample_rate_devider+1;pastData = sampleAudio(pastData,ai,dataLengthConstant); % if we got a audio triggerif(playing ~=0) playing=playing-1;else if(testImpulse(pastData,threshHold)==1)playing = 5; soundType = getWhichSound(hitPosition,edgePosition);% makeSound(soundType); if (soundType==1)%play sound1 sound(sound1,Fs1);elseif (soundType==2) %play sound 2sound(sound2,Fs2); elseif (soundType==3)%play sound 3 sound(sound3,Fs3);else (soundType==4) %play sound 4sound(sound4,Fs4); endend endend

Questions & Answers

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 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.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Virtual drum kit. OpenStax CNX. Dec 19, 2013 Download for free at http://cnx.org/content/col11607/1.1
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