Apple Improves Audio Messages Quality in iOS 12.2
In the iOS 12.2 beta,
Apple has improved the quality of the audio messages
sent in the Messages app after switching to a new
Opus codec at 24000 Hz,
up from the previously used AMR codec at 8000 Hz.
Apple previously used the .AMR file format
for its audio messages,
but in the beta, has swapped over to .CAF.
试听：
https://twitter.com/frederikRiedel/status/1105793408357019648
情报来源：
https://www.macrumors.com/2019/03/13/ios-12-2-improved-audio-message-quality/
能注意到这个改变真是太厉害
应该是因为美国人常用 iMessage
随着网络即将进入 5G 时代
加强语音品质也是理所当然