According to the query of php Chinese website, AAC is a kind of audio coding with high compression ratio, which mainly adopts two strategies: discarding signal components irrelevant to perception and removing redundant parts of coded signals. In fact, at the bit rate of 128Kbps, AAC coding has the best effect. Dolby Lab thinks that the performance of AAC format exceeds that of MP3 format of 128Kbps at the bit rate of 96Kbps. The same is 128Kbps, and the sound quality of AAC format is obviously better than that of MP3. This shows that the Bluetooth display aac is high-end.
The commonly used bit rate of AAC in Bluetooth is 256Kbps. But one thing, even if using AAC audio source, Bluetooth can't directly transmit its original data stream. Instead, AAC is decoded into PCM first, and then encoded into AAC code supported by Bluetooth before transmission. In application, the biggest supporter of AAC coding is Apple, and devices such as iPhone, iPad and AirPods all support AAC. A lot of music in iTunes software is also stored in AAC encoding format.