A split band vocoder in which the LP excitation is split into voiced and unvoiced frequencies is presented. In doing this the coder's performance during both mixed voicing and speech containing acoustic noise is greatly improved, producing soft natural sounding speech. In addition a variable rate version which achieves an average rate of 1.4 kb/s is detailed. The issue of fixed point real time implementation of this coder is also presented.

Full Paper   Acoustic Example #1   Acoustic Example #2   Acoustic Example #3  

Bibliographic reference.  Villette, Stephane / Stefanovic, Milos / Atkinson, Ian / Kondoz, Ahmet (1997): "High quality split-band LPC vocoder and its fixed point real time implementation", In EUROSPEECH-1997, 1243-1246.