The ITU (CCITT) coding formats Vox Studio supports are all sampled at 8 KHz. Refer to the ITU G-series publications for a detailed description of the supported algorithms.
Vox Studio supports two ITU (CCITT) companding algorithms (G.711) and 8 ITU (CCITT) ADPCM compression algorithms (G.721, G.726). The ITU ADPCM algorithms are very processor intensive (you need a fast PC).
G.711
Vox Studio supports the ITU G.711 specification for A-law and Mu-law companding. See the glossary in this documentation for a brief description of A-law and Mu-law.
G.721
32 KBps ADPCM, 4 bits at 8,000 samples/s. See the glossary in this documentation for a brief description of ADPCM.
G.726
40 KBps ADPCM, 5 bits at 8,000 samples/s
32 KBps ADPCM, 4 bits at 8,000 samples/s
24 KBps ADPCM, 3 bits at 8,000 samples/s
16 KBps ADPCM, 2 bits at 8,000 samples/s