SBC is an encoding format mandated by the A2DP (Advanced Audio Distribution Profile) protocol, which is supported by all Bluetooth devices. SBC performs lossy processing during encoding to achieve data compression, supporting sampling rates of 16kHz, 32kHz, 44.1kHz, and 48kHz.

AAC is an abbreviation for Advanced Audio Coding, jointly developed by companies such as Fraunhofer IIS, Dolby Laboratories, AT&T, Sony, etc., with the aim of replacing the MP3 format. At the same bit rate, AAC has better listening experience than SBC.

LDAC is a wireless audio encoding technology developed by Sony, which is three times more efficient than standard Bluetooth encoding and compression systems. When transmitting LPCM high-resolution audio, LDAC technology can maintain its maximum bit depth and frequency response range, and even audio up to 96kHz/24bit can achieve high-quality transmission.

For ordinary consumers, they do not need to know any advanced technology, as long as they know that in terms of Bluetooth encoding technology, the order from top to bottom is as follows: LDAC>aptX HD>aptX>AAC>SBC. The transmitter and receiver must support the same protocol at the same time, otherwise both will be converted to SBC mode transmission. The Apple iOS system prioritizes AAC encoding by default, while early Android used SBC by default, which is why Bluetooth sound quality was not as good as Apple phones in the past.