Applet

 

Figure 1:The Human Speech Organ
[Demonstration of the vocal tract function (mpeg or avi)]
 

 

Figure 2a : Typical impulse sequence

 

Figure 2b: Variation of the pitch frequency

 

Figure 3: Sound Production
 


Figure 4a: The Human Speech Production
Figure 4b: Speech Production by a machine


Figure 5: LPC

 

Technical note

The core of this tutorial is a simulation of an LPC vocoder. The simulation is realized by an Java applet. The main functions of the simulation can be used in any java capable browser, but the microphone feature requires Netscape Communicator 4.0.6 (or later) on the Windows platform and the installation of two files:

  1. Download (with right-mouse-click) SoundBite.dll and move it into Netscape's Java/Bin/ directory (often C:Programme/Netscape/communicator/Program/Java/Bin/).
  2. Download (with right-mouse-click) com.scrawl.sound.jar and move it into Netscape's Java/Classes/ Directory (often C:Programme/Netscape/communicator/Program/Java/Classes/).
  3. or
  4. Download soundbite.zip, extract the files SoundBite.dll and com.scrawl.sound.jar and move these files into the correct Netscape's directories (see 1. and 2.). Once the files has been installed Netscape must be relaunched.
These files are based on the shareware product SoundBite 1.0 developed by Scrawl and are supported here with kindly permission of Salman Burkie. If the recording button is activated and you speak for the first time, one window is started:
  • "Unterzeichnete Klassen ..."
    Press the I grant/Annehmen button.
Now your own voice can be recorded.

Applet