Which ITU standard covers dual-rate voice compression in videoconferencing?

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Multiple Choice

Which ITU standard covers dual-rate voice compression in videoconferencing?

Dual-rate voice compression means a codec can operate at two selectable bitrates, letting videoconferencing systems trade off audio quality and bandwidth in real time. The ITU-T standard that provides this dual-rate capability is G.723.1, which offers two low bitrates—5.3 kbps and 6.3 kbps—designed for efficient speech encoding over constrained networks. It uses CS-ACELP, making it well-suited for maintaining intelligibility when bandwidth is limited. In contrast, G.711 delivers a single, fixed 64 kbps PCM voice stream, and G.722 provides fixed wideband rates (48/56/64 kbps) without a true dual-rate option. H.239, on the other hand, is about adding a secondary data/video stream in H.323 videoconferencing, not about voice encoding. So the standard that matches the idea of dual-rate voice compression is G.723.1.

Dual-rate voice compression means a codec can operate at two selectable bitrates, letting videoconferencing systems trade off audio quality and bandwidth in real time. The ITU-T standard that provides this dual-rate capability is G.723.1, which offers two low bitrates—5.3 kbps and 6.3 kbps—designed for efficient speech encoding over constrained networks. It uses CS-ACELP, making it well-suited for maintaining intelligibility when bandwidth is limited.

In contrast, G.711 delivers a single, fixed 64 kbps PCM voice stream, and G.722 provides fixed wideband rates (48/56/64 kbps) without a true dual-rate option. H.239, on the other hand, is about adding a secondary data/video stream in H.323 videoconferencing, not about voice encoding. So the standard that matches the idea of dual-rate voice compression is G.723.1.

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