For example, four real-time 7.2 kbps speech coders were evaluated by the Telecommunications Industry Association (TIA) for the purpose of selecting a speech coder for the APCO Project 25 North American land mobile radio communication system. These systems have been consistently shown to provide the highest performance of any speech coder available. APCO Voice Quality Test DVSI's IMBE and AMBE speech coders are undefeated in numerous independent evaluations, winning 8 out of the last 8 evaluations. They are also widely used in many other applications such as in secure communications, voice storage, and desktop video conferencing. The IMBE and AMBE speech coders have been selected for many international mobile communication standards, including standards in satellite communications, commercial aircraft telephony, and digital mobile radio. In addition, the speech coders have been designed for robustness in both background noise and channel errors. MBE-based technology provides superior speech quality, while requiring substantially fewer MIPS and less memory than other speech coders. 1 1 of 5 6:39 AM DSP Chips Vocoder Boards Voice Codec Units Application Notes Papers IMBE and AMBE The Improved Multi-Band Excitation (IMBE ) and the Advanced Multi-Band Excitation (AMBE ) speech compression algorithms are the performance leaders for low-bit-rate speech compression systems.
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