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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

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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?
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
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit 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, Virtual drum kit. OpenStax CNX. Dec 19, 2013 Download for free at http://cnx.org/content/col11607/1.1
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