KVF.4 is a Kilomux voice module providing high-quality compression of two voice channels for maximum utilization of the main link bandwidth.
KVF.4 compresses the analog or digital (ISDN) voice signal at selectable rates of 4.8, 6.4, 7.2, 9.6 or 12.8 kbps. The data rate is soft-selectable, according to the quality desired and the available main link bandwidth.
For data rates of 6.4 kbps and above, voice compression is based on the MPMLQ (Multipulse Maximum Likelihood Quantization) speech coding technique, as defined in the ITU G.723.1 Standard. The compression at 4.8 kbps uses a proprietary compression technique.
Toll voice quality (comparable to 32 kbps ADPCM) is achieved when using a digitizing rate of 6.4 kbps and above; very high voice quality is achieved when using 4.8 kbps compression ratio.
