The sound project software has three main functions:
1- Creating sound files (WINDOWS compatible WAVE files with the '.wav' extension).
2- Editing lists of sound files to be used for experiments (WINDOWS compatible 'Play Lists' with a choice of '.wpl', or '.asx' extension).
3- Running experiments using play lists. (Sample Results Data File)
the software will not run off a CD ROM; it should first be copied to the hard drive.
Download the "EXE" file:
1- Creating sound files
Sounds are created by adding several Sine waves together as follows:
xt =∑ (An
t + Φn
Select the "Number of Sine Waves" that will make up the sound
(the maximum has arbitrarily been set at 9).
- Select "Sine Wave Number" 1
- Type in the desired "Frequency" for sine wave number 1.
- Type in its desired relative "Amplitude". To avoid
clipping, the sum of the amplitudes should not exceed 100%. If the
waves are to have equal amplitudes, instead of entering the relative
amplitude for each sine wave, the "Auto" check box can be
checked and the computer will enter the correct amplitude depending on
the "Number of Sine Waves" selected.
- Enter the "Duration" of the sound to be generated. The
duration can only be set for the first sine wave and remains the same
for all the others. The duration can either be specified in seconds or
- The "Phase" cannot be set for the first sine wave. The
first sine wave serves as reference for all the others.
- Repeat (A) for all the desired sine waves.
- The duration cannot be changed: it remains the same for all
- A "Phase" shift can be added if desired.
- The "Total Amplitude" of the final sound
must then be set. It is recommended to first use the maximum (100%) and
adjust the hardware volume to the highest volume to be used for this
wave as measured with an audio dB meter. Once set, the manual hardware
volume should remain unchanged. The volume of the other sound waves
should be set by mean of the software: "Total Amplitude (% of max)".
- Click the command button: "Generate and Test the
Sound". A temporary sound WAVE file (called "MHOGMST.wav") is
created and then played for testing. Once generated, the sound file can
be played over and over again and saved to a permanent disk file for
later use if desired. These files follow the "Interchange Format Files"
(IFF) specifications for WAVE type files. They are setup for two (2)
speaker systems and a 44,100 Hz sampling rate.
- The newly generated file can then be saved through the menu:
"File \ Save Generated Sound As".
2- Editing lists of sound files.
These lists are themselves files to be used for experiments (WINDOWS compatible 'Play Lists' with '.wpl' or '.asx' extensions).
The Play List editor normally opens with the last play list used, loaded and displayed on its front panel. The name of the play list is shown in the yellow label. The names of the sound files are displayed in the white list box in the same order as they will appear during a play back or an experiment.
- Adding a Sound.
First specify the location in the list where the new sound is to be inserted, by either clicking on the list or by adjusting the blue label to the correct number. Then, clicking the "Add a Sound into location:" command button, will open a browse window from where the sound file can be selected.
- Removing a Sound.
Any sound can be removed from the list by selecting it from the list (clicking on it with the mouse), and then clicking the "Remove the Selected Sound" command button.
- Moving a Sound from one location to another.
a) you can select the sound from the list, set the move to location (green text box) to the desired location, then click on the "Move Selected Sound into:" command button.
b) or you can select the location to which you want to move, click on the green "into" text box, select the sound you want to move, then click on the "Move Selected Sound into:" command button.
- Clearing the Sound List.
You can clear the whole list by either clicking on the "Clear the Sound List" command button, or by selecting the menu "File \ New Experiment" option. The menu "New Experiment " will also clear the 'sound/play list' file name.
- Saving the Sound List
The menu options: "File \ Save Experiment" and "File \ Save Experiment As" can be used to save a new or modified sound list.
3- Running Experiments.
By means of the menu you can load or unload Experiments / Sound Lists ('.wpl' or '.asx') files into or from the orange "List of Experiment Files" (Scroll down).
Selecting (Clicking on) a file from the orange "List of Experiment Files" will cause the software to read it from the disk, display its name in the yellow "Current Experiment File Name" label and display the first sound from the list in the green "Next Sound File Name" label. The number in the pink "Count Down" label should then show the total number of sound files in the experiment file.
The data file into which the results of the experiment will be
saved, can be changed through the menu "File \ Result Data File Name".
If the "Saving" check box is checked, the experiment results will be
appended to the file if the file already exists. Otherwise a file will
The experiment participant identification should also be typed into
the bottom purple text box. Whatever is entered here will be saved in
the results data file. (Sample Data File)
- To start the experiment click the "Go" command button.
- The first sound will be played.
- The ratings must then be entered in the "Loudness" and
"Pleasant/Unpleasant" text boxes.
- Click the "Go" button that changed into a "OK Next" button in
order to start the next sound., and so on...
- When the last sound has been played and the "Count Down" has
reaches "0" the "Go" / "OK/Next" button has now changed into an "OK"
button. Click it to enter the last rating into the "Result Data File".
- Now the next experiment file should be selected.
2005 March 17