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This module explains some of the physical aspects of sound in a format that is accessible to blind students.

Table of contents


This module is part of a collection titled Accessible Objected-Oriented Programming Concepts for Blind Students using Java . It explains some of the physical aspects of sound ina format that is accessible to blind students. It also explains a little about the trigonometric sine and cosine functions and suggests that they canbe used to create sound with a computer. An audio file is provided where audio pulses of different frequencies are used to represent points on agraph of a sinusoid.

General background information

By this point in the course, you should have learned enough that you can put Java OOP to work in a substantive way. Normally at this point, mysighted students would begin using OOP to manipulate the pixels and colors in digital images. That is not well suited to teaching OOP to blind students.In this course, which is designed specifically for blind students, you will begin writing substantive programs that deal with something that you areprobably very good at -- sound.

For example, you will soon learn how to write a Java OOP program to produce simple sounds such as TonesStereo .

(Note that if you are viewing the HTML version of this module on the Legacy site, you should be able to download this file and the other audio files in thismodule and play them using any standard media player that supports audio files of type AU. However, if you are on the OpenStax site, or ifyou are viewing the PDF version of this module on either site, you may not be able to download the file.)

As you study future modules in this collection, you will learn to write OOP programs to produce more complex sounds such as StereoPingpong .

Ultimately you will learn to write OOP programs that can be used to compose and play various melodies such as the following:


What is sound ?

An old physics question goes something like this. If the earth were populatedsolely by humans and a tree fell in the forest with no humans present, would it make a sound?

The answer is "No, it would not make a sound." The explanation follows.


Assume that someone strikes the top of a car with their hand. This would cause the metal roof of the car to startvibrating. That vibration would cause the adjacent air molecules to also vibrate causing them to collide with their neighbors. Those molecules would collide withtheir neighbors, and on and on. We can think of this as a wave of vibrating molecules propagating outward from the car.

This wave of vibrating molecules propagates outward at a speed of approximately one mile every five seconds and decreases in intensity as itpropagates out from the source. At some distance from the source, the intensity of the vibrations has decreased to an insignificant level.

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
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.
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
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Source:  OpenStax, Accessible objected-oriented programming concepts for blind students using java. OpenStax CNX. Sep 01, 2014 Download for free at https://legacy.cnx.org/content/col11349/1.17
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