We have developed vocoder for 600 bps bit rate, basing on our proprietary SPR (Sinusoidal Pulsed Representation) model of speech coding.
We compared the new vocoder with MELPe 600 bps standard vocoder and found superiority of our vocoder by all characteristics, including speech quality, robustness, delay, computing complexity and memory usage. Moreover, the superiority is significant for majority of the characteristics.