FOR REAL-TIME SUBBAND AUDIO CODING*
Davide Quaglia, Alfonso Montuorit, Eros Paserot, Juan Carlos De Martint · 2002
We present an interactive educational DSP platform for real time subband audio coding. The tool integrates a DSP course on advanced audio coding and focuses on wavelets, sub band coding, and signal quantization. The package con sists of a Windows control application running on a PC and real-time DSP code implemented on a Texas Instruments DSP Starter Kit (DSK), which performs the actual audio en coding and decoding process. The tool is interactive since students can customize the codec by changing some en coding parameters through the PC interface and then ver ify the effect on the coding process. The DSP codec ac cepts audio samples in real-time via the DSK audio analog input port and sends the reconstructed samples to the out put port. The graphical user interface allows to choose the type of filter-bank and scalar quantization; the availability of the full source code and of a DSK makes possible to experience first-hand the main aspects of real-world DSP development, e.g. , real-time programmin g, arithmetic pre cision and algorithmic delay. The software is available at http://multimedi a.polito.it/dspw avelab.