| In recent years, audio coding has proved to be of great importance for applications such as mobile communication and multimedia systems. Our research has focused on adapting a low bit rate/fixed bit rate audio coder to handle signals at a wide range of bit rates and sampling rates. Bit rates as low as 4 kbps and sampling rates between 4 kHz and 16 kHz were incorporated. Further, the coder can change bit rates during transmission in order to adapt to the available channel bandwidth. The coder was implemented in the C programming language and its performance evaluated. It was found that the quality of the reproduced audio for this coder requires some improvement, but the scalability performs smoothly, with transitions causing no artifacts, and reasonable loss of quality at the lowest bit rates. |
