15.4 Sound Waves Sound Harmonics |
| Instructions: Click on the "Start Simulation" button to open the applet window. Set the waveform by using the blue and green slide controls. The blue slide control adds sine function components to the wave; the green control adds cosine function components. The frequency corresponding to each of the controls is a multiple of the base frequency; it is displayed below the control for even-multiple frequencies of the base. The obtained waveform is shown to the right. The leftmost controls are used to control the overall amplitude of the wave and its base. You can change the base frequency by entering the value (20 < f < 2000) in the corresponding box. You start the audio by pressing the "play" button. You may select a known waveform from the drop-down menu. Navigation: You can come back to this window by pressing the "Close Simulation" button on the bottom frame of the utility. |
| Explanation: You can use this utility to sample sounds of different frequencies. You can make a rough check of your audible range and compare it to the one given in section 15.4. Note that the speakers of your computer may not be able to produce the sound range required. You can use the utility to listen to pure tone waves as well as more complicated waveforms. You can also use it to do a Fourier analysis of a wave: identify the pure tone components of the waveform. |
| Source: Fu-Kwun Hwang Go to the web site and link to the Online Library for further information. |