2. Audio Codec

VoiceChat only supports encoded audio sampled at 16 bits/8 kHz. In addition, it only supports 4-bit ADPCM encoding.

In conference mode, you need ( (Number of participants – 1) * 2 ) times the bandwidth.

Table 2-1 Relationship Between the Audio Frame Length and the Size of Audio Data

Audio Frame Length

Size of Audio Data (bytes)

64 ms (minimum)

260

144 ms (default)

580

192 ms (maximum)

772

These audio data sizes refer only to the payload. Added to this are the IP header, the UDP header, the communications library header, and the VCT library audio packet header (12 bytes).


CONFIDENTIAL