Tencent Music Tech Team
Jan 6, 2017 · Fundamentals
Principles and Process of the SBC Audio Codec in Bluetooth Systems
The SBC (Subband Codec) used in Bluetooth headsets compresses PCM audio by splitting the signal into 4 or 8 sub‑bands, allocating bits according to perceptual importance, and encoding with analysis filters, scale factors, APCM and bit‑packing, then decoding reverses the process to reconstruct audio, providing lossy compression across supported sample rates and channel modes.
BluetoothSBC codecaudio compression
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