Advanced Multi-Band Excitation (AMBE) is a very powerful proprietary speech coding standard developed by Digital Voice Systems, Inc..
AMBE operates at very low bitrates of between 2000 and 9600 bit/s. The audio data is usually combined with up to 7 bit/s of forward error correction data to produce a total RF bandwidth of approximately 2250 Hz (compared to 2700–3000 Hz for an analog single sideband transmission). This has the effect of increasing sound quality and removing static from HF communications. Lost frames can be masked by using the parameters of the previous frame to fill in the gap.
AMBE has a low complexity, lower than CELP format.