Editing Harmonic Vector Excitation Coding (section)

===Voiceless (VXC) Residual Coding===
Unvoiced segments are encoded according to the [[CELP]] scheme, which is also referred to as '''vector excitation coding''' (VXC).<ref name="hvxc" /> The CELP coding in HVXQ is performed using only a stochastic codebook. In other CELP codecs, a dynamic codebook is used additionally to perform [[Long Term Prediction|long-term prediction]] of voiced segments. However, since HVXC does not use CELP for voiced segments, the dynamic codebook is omitted from the design.