Codecs

When you have a Bluetooth headphone connected to your phone, digital audio data transmitted over Bluetooth from your phone to your headphones is encoded and decoded, so called codec (codec is short for coder/decoder) - a specified format. Each code determines how audio data is transferred (encoded and decoded) over Bluetooth. In terms of fidelity, the LDAC codec is the best, but it's not very good for latency, stability and battery life (it drains battery faster than other codec). LC3 replaced the AptX-LL for the lowest latency but it's varied between devices and how it is implemented. AAC and SBC don't sound as good as LDAC, but it drains Bluetooth accessories' battery slower. Note that Bit Depth, Sampling Rate and Bit Rate are three critical parameters.