Hearing Aids connecting through ASHA use G.722 codec (Hearing aid audio support using Bluetooth LE | Android Open Source Project), while devices (like Phonak or Oticon Connect Clip) using classic bluetooth use SBC. Not sure about MFI though, something proprietary probably.
Not sure about MFI though, something proprietary probably.
From the Apple support site “AirPods, AirPods Pro, AirPods Max, and Beats wireless headphones use Apple AAC Bluetooth Codec to ensure excellent audio quality.” So if using Airpods Pro 2 with hearing assistance enabled I assume it will use AAC from an iPhone.
They also say “AirPods 4, AirPods 4 with Active Noise Cancellation**,** and AirPods Pro 2 with USB-C Charging Case provide Lossless Audio with ultra-low latency when paired with an Apple Vision Pro.”
So I assume the Airpods Pro 2’s (with USB Type C charging case - which is what I have) can do lossless over an LE Codec - but not with an iPhone just with the Apple Vision Pro,