The decoder is required to support any combination of these parameters.
Audio channel type and number: Joint Stereo, Stereo, Dual Channel, Mono.SBC codecSBC has lots of different parameters that are negotiated during the connection setup phase: It turns out that the low quality of SBC is caused by artificial limitations of all current Bluetooth stacks and headphones' configuration, and this limitation can be circumvented on any existing device with software modification only.
These codecs require licensing fees, that's why devices with them are more expensive. A common recommendation to get better sound quality is to buy devices and headphones with aptX or LDAC codecs support. Some wireless headphone users note low sound quality and lack of high frequencies when using the standard Bluetooth SBC codec, which is supported by all headphones and other Bluetooth audio devices. Before reading this article, it is recommended to read the previous one: Audio over Bluetooth: most detailed information about profiles, codecs, and devices / по-русски
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