New TWELP 2400 bps Robust and 4800 bps Robust vocoders provide highest speech quality in very noisy channel- much better than any known vocoders as, for example, MELPe 2400 bps and GSM AMR 4750 bps vocoders respectively.

TWELP 2400 bps Robust vocoder
TWELP 4800 bps Robust vocoder

 

New TWELP 1600 bps vocoder provides speech quality better than MELPe 2400 bps vocoder.

TWELP 1600 bps vocoder

 

New TWELP 3600 bps vocoder provides speech quality close to GSM AMR 5150 bps vocoder.

TWELP 3600 bps vocoder

 

The updated TWELP 2400 bps vocoder provides speech quality as GSM AMR 4750 bps vocoder.

TWELP 2400 bps vocoder