NATO STANAG 4479: a standard for an 800 bps vocoder and channel coding in HF-ECCM system

This paper presents a new voice coder for applications in very low bit rate communication systems normalized by NATO under STANAG agreement 4479. The originality of this standardization is the description of both the source and the channel coding. It is the natural continuation of the well known LPC10e 2400 bps voice coder normalized under STANAG 4198. The analysis and synthesis are the same as in the LPC10e vocoder but the quantization process is specific. The main points of innovation are presented. An associated error correcting scheme increases the source bit rate from 800 up to 2400 bps. It has been optimized in the framework of HF-ECCM system (HF-electronic counter counter measure), to take into account all possible channel perturbations as well as system constraints especially in terms of minimization of the delay and turn around time.