Developing
Streaming Audio Lectures for Online Courses
By Nora Strasser
Friends University
2100 University
Wichita, KS 67213
(316) 295 – 5879
fax: (316) 295 – 5404
strasser@friends.edu
Introduction:
It is difficult to successfully teach an online mathematics course. There are many problems that need to be overcome. First, it is difficult using mathematical symbols on the internet. However, this problem is becoming less troublesome since more attention has been drawn to it. Most course administration software now allow the smooth integration of symbols. Second, the internet is very dependent upon reading. Most information is transmitted through the written word. This is a problem because many students find it difficult to read mathematics and need additional forms of learning. I will be considering both of these issues in this paper.
We will look at how to create lectures that incorporate symbols. These lectures will be used as the basis for the course. The lectures will provide the written version of what math teachers normally put on a chalkboard or overhead.
Next, we will look at how to create an audio portion that will function much like what we usually say during a traditional course. One difficulty dealing with audio over the internet is that audio files can be very large and difficult to download. That is the reason that we are going to be using streaming audio. Streaming audio allows the user to download only a small portion at a time and thus can start listening to the lecture before the entire file is downloaded. A slower network connection can be used successfully.
Creating Lectures with
Mathematical Symbols and Diagrams:
PowerPoint was the software
chosen to create the presentations. It
was chosen since it is readily available to most people and easy to use. In order to get mathematical symbols into
the PowerPoint slides, the Equation Editor provided by Microsoft was used. The equations can be created using the
Equations Editor directly within PowerPoint.
Other types of equation editors could be used but then the equations
would need to be pasted in. Please note
that the Equation Editor is usually installed as part of the complete
installation of Microsoft Office. If
you installed Microsoft Office using the default installation, the Equation
Editor may not be available. It will
need to be installed to be usable.
In order to access the
equation editor, you must go to the toolbar and select the Insert command. After you have clicked on Insert, a drop
down menu will appear. You will see
that one choice on the drop down menu is Object. Click on Object and a pop up menu will appear. On the Create New tab choose Microsoft
Equation. The Equation Editor will
appear and you can create your equation.
If you use the equation editor often, it is a good idea to customize
your toolbar so that you don’t need to go through these steps each time.
To customize your toolbar,
click on Tools and choose the Customize from the drop down menu. Select the Commands tab and from within the
commands tab select the Insert Category.
Scroll down the Commands available until you see the Equation
Editor. Click on the icon for the
Equation Editor and drag it onto the toolbar.
Choose a location that makes sense to you. I usually put the icon next to the icon for creating bold text.
Putting diagrams into the presentations was more difficult. There are several techniques that can be used. Some diagrams, such as number lines, were drawn using the Microsoft drawing program located within PowerPoint. Some diagrams could not be created using the drawing program and were created by hand and then scanned. The scanned diagrams were saved as JPEG files and then added to the PowerPoint presentations.
Once
the presentations were completed, a script for narration needed to be
composed. This script needed to include
every comment that was to be made for all slides in the presentation. The easiest way to work with the script was
to type it into the notes section for the slide in the PowerPoint
presentation. Once the script was
completed and typed in, the notes pages for the presentation were printed. The narrator was able to read directly from
the notes pages to complete the narration.
A script is very important in order to produce a smooth and professional
sounding recording.
Creating Streaming Audio Presentations:
Once
the PowerPoint presentation is completed, it is time to creating the streaming
audio. We will be using Real Presenter,
a piece of software available from Real.com that will create the audio presentation
for us. When Real Presenter is
installed, it becomes a part of PowerPoint.
A new choice is offered on the toolbar.
This choice is labeled Real Presenter and includes a drop down
menu. One of the choices on that menu
is “Narrate a Presentation”. By picking
this choice, you are asked to select the type of presentation that you are
going to record. This presentation
could be a live presentation to broadcast over the web or a presentation that
is recorded and made available later.
We will opt for the later choice.
You will then be asked to
enter information about your presentation.
The information entered will include your name, the name of the
presentation, and a description of the presentation. The name of the presentation will be the name of the folder that
your presentation will be stored in.
Finally, you are first asked
to test your audio equipment. In
particular, you need to make sure that you microphone is working properly and
that the record level is set to an appropriate setting. My recommendation is to go to your volume
control on your computer and under the Play Control, choose the mute all
option. Also, you should go to the
Record Control and make sure that the microphone is selected as the input
device. Once this is accomplished, you
can begin the narration.
You can use the microphone
provided with your computer system.
However, the quality of this microphone is usually somewhat
lacking. If you wish to have the best
recording possible, I recommend using a microphone that is powered. It will greatly improve your recording. It is also helpful to have a microphone that
is multidirectional since this allows the narrator some freedom of movement while
recording.
After you have finished the
narration for each slide, you click the left mouse button to move to the next
slide and continue recording. When you
are finished, you will be asked if you want to save the recording. After you save the recording, you can view
your presentation and rerecord certain slides if necessary.
The
Real Presenter software will create a folder with a large number of files on
your computer. This entire folder needs
to be put onto a streaming server to be available for students to use. If your web site is being hosted on another
computer, you will need their help in placing your streaming audio presentation
on this server. If you have access to
your own streaming server, the process is simpler. Once the presentation has been put on the streaming server, you
can create links to it within your course web site. This will allow students access to it. The trainer.smi file is the one that needs to be linked and
run.
Conclusion:
Streaming
audio lectures provide students with the opportunity to learn mathematics on
the internet by not only reading, but listening as well. This recreates the typical classroom setting
for students involved in online learning.
Student learning should be improved by using this method.
Creating
streaming audio lectures is not as difficult as it sounds and should provide
faculty with an option for online learning.
There are many other uses that these streaming audio lectures can be
created for. You can use these lectures
for students who miss class. These
lectures can be used for reviewing certain topics. These lectures can be used as a supplement to the traditional
classroom on a companion web site. I’m
sure that there are many other uses.
The availability of the software needed to create these lessons and the
ease with which they can be created makes streaming audio a viable option for
many different uses.