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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

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 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
How can I make nanorobot?
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
how can I make nanorobot?
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.
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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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