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In this project you will create your own LabVIEW application that can produce a standard MIDI file. You will first develop a library ofutility subVIs that produce the various components of the file (header chunk, track chunks, MIDI messages, meta-events, and delta times), as well as asubVI to write the finished binary file. You will then combine these into a a top-level VI (application) that creates a complete MIDI file based on analgorithm of your choosing.

Required background

If you have not done so already, please study the pre-requisite modules, MIDI Messages and Standard MIDI Files . You will need to refer to both of these modules in order to complete this activity. Also, you will find it helpful to have already worked through the mini-project MIDI File Parsing .


In this project you will create your own LabVIEW application that can produce a standard MIDI file. You will first develop a library of six subVIs that can be combined into a top-level VI that operates just like MIDI_UpDown.vi below (click the“Run”button (right-pointing arrow) to create the MIDI file, then double-click on the MIDI file to hear it played by your soundcard):

MIDI_UpDown.vi produces a two-track MIDI file, with one track an ascending chromatic scale and the other a descending chromatic scale. You can select the voice for each track by choosing a tone number in the range 1 to 128. You can also select the duration of each note (“on time”) and space between the notes (“off time”).

Remember, MIDI_UpDown.vi is simply a demonstration of a top-level VI constructed from the subVIs that you will make. Once you have constructed your library of subVIs, you will be able to use them in a wide array of projects; here are some ideas:

  • simulated wind chime: with an appropriate voice selection (see the General MIDI Level 1 Sound Set to choose a bell-like sound) and random number generator for delta times
  • bouncing ping-pong ball: write a mathematical formula to model the time between bounces and the intensity of bounces
  • custom ring-tone generator for a cell phone

These are just a few ideas–be creative! Remember to take advantage of your ability to control the sound type, note-on velocity, pitch bend, etc.

Tour of the top-level block diagram

Click the image below to take a quick tour of the top-level block diagram of MIDI_UpDown.vi . The role of each subVI will be discussed in some detail, and you will have a better idea of the design requirements for each of the subVIs you will create.

[video] Tour of the top-level block diagram of MIDI_UpDown.vi

Subvi library

You will create six subVIs in this part of the project. Develop them in the exact order presented! Also, make sure you test and debug each subVI before moving on to the next. Many of the concepts and techniques you learn at the beginning carry forward to the more sophisticated subVIs you develop toward the end.

The requirements for the subVIs are detailed in the following sections. Input Requirements specify the name of the front panel control, its data type, and default value, if needed). Output Requirements are similar, but refer to the front panel indicators. Behavior Requirements describe in broad terms the nature of the block diagram you need to design and build.

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 ?
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
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I'm interested in nanotube
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Ramkumar Reply
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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, Musical signal processing with labview -- midi for synthesis and algorithm control. OpenStax CNX. Nov 09, 2007 Download for free at http://cnx.org/content/col10487/1.2
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