SpeakingX

The Bluetooth mandatory audio codec for music is subband codec (SBC), as described in the
specification of the Advanced Audio Distribution Profile (A2DP) in appendix B.
SBC obtains high quality audio at medium bit rates with low
computational complexity. It uses the same polyphase filter bank as in MP3 with 4 or 8 subbands, an adaptive bit allocation
algorithm, and simple adaptive block PCM quantizers. SBC supports

• 16, 32, 44.1, 48 kHz sampling rates
• Mono, Dual channel, Stereo, Joint Stereo channel modes

For joint stereo at 44.1 kHz, A2DP recommended settings (Block length = 16, Allocation method = Loudness, Subbands = 8) for SBC is 229 kb/s for middle quality (Bitpool value = 35), and 328 kb/s for high quality (Bitpool value = 53). A2DP profile also optionally supports MP3, AAC, and ATRAC.

bluetooth, SBC