_ Arc SBC, which is the standard encoding format of Bluetooth audio. It is the mandatory coding format of A2DP (Advanced Audio Distribution Profile) protocol. The maximum allowable rate of single channel is 320kbit/s, and that of dual channel is 512kbit/s. All Bluetooth audio chips will support this audio coding format.
_AAC is a technology provided by Dolby Laboratories for the music community, and it is a coding algorithm with high compression ratio. Iphone will use AAC format when transmitting Bluetooth. At present, the Bluetooth audio of Apple devices basically adopts AAC coding technology. Moreover, many receiving devices such as Bluetooth speakers/headphones on the market also support AAC decoding.
_APT-X is a patented coding algorithm of CSR, which became its main coding technology after it was acquired by Qualcomm, and it was advertised that it could achieve CD sound quality. Most new Android machines are equipped with APT-X. Compared with the traditional Bluetooth coding technology, this audio coding technology is more efficient, with more details of sound preservation, and the actual listening sense is better than the first two. Equipment using APT-X technology needs to apply for authorization from Qualcomm and pay the authorization fee, and needs the support of the sender and receiver.