The Bluetooth Audio Distribution profile uses Low complexity sub-band Coder (SBC) as its mandatory audio compression codec. More recently, SBC has been selected for Bluetooth wideband voice communication. Since SBC was first designed for audio compression, it does not incorporate the features that speech coders commonly use. The use of Voice Activity Detection and Comfort Noise Generation to reduce bandwidth usage and power consumption is an example. In this work, we investigated extensions for SBC that would make it better suited for voice compression in the Bluetooth framework. The proposed enhancements were evaluated on the basis of their impact on voice quality, their implementation requirements, and their bandwidth savings.
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https://aes2.org/publications/elibrary-page/?id=14477
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