Speech signal processing module is mainly made of CODEC and AMBE-2000. The high-performance
stereo audio CODEC is specifically designed for the digital signal processing (DSP) chip by TI company. It is
great flexible for AMBE-2000 chip in speech rate choice and forward error correction (FEC) rate. The user of
AMBE-2000 chip can grow at 50 bps, free set in 2.0 kbps~9.6 kbps data rate range. The user must allocate
more data rate percentage to FEC coding for the channel of the high bit error rate (BER)