Codec Protocol of Bluetooth Chip

    SBC: It is a mandatory codec format under the A2DP protocol. The sound quality is very general. It was initially used for monophonic voice calls because the voice sound is narrow. When Bluetooth transmission does not support AAC and aptx, SBC is used for transmission. The sound quality is average, and almost all devices support SBC.

    APTX: It originally belonged to APTX company, and was acquired by British CSR later, and then acquired by Qualcomm in 2014, so APTX is an important part of Qualcomm's codec:

    APTX:It supports 48Khz/16-bit audio, close to CD quality

    APTX LL: Low latency, capable of delay delay within 100ms

    Aptx HD: Supports 48Khz/24-bit audio, and the increase in resolution significantly reduces the signal-to-noise ratio while significantly reducing distortion. In principle, it allows you to hear the tiniest details of the music, providing a realistic sound quality that is indistinguishable from the actual sound of a live performance.

    The second generation of APTX Adaptive: It can automatically switch between high-fidelity music and low-latency games and automatically switch between APTX HD high quality (24bit/48KHz) and APTX Low Latency (16bit/44.1KHz), taking into account user experience and battery life .

    AAC: Apple IOS system standard, the technology provided by Dolby Laboratories, is a high compression ratio encoding algorithm. Apple music has a large number of  AAC audio, the sound quality is better than MP3 at the same bit rate.

    HWA/LHDC: Hi-Res Wire less Audio.It's a pity it's less and less seen now.

    LDAC: A Bluetooth transmission technology developed by Sony, which can transmit 3 times the data of ordinary bluetooth and realize lossless music playback under bluetooth, but only Sony devices support this technology.

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