In Spain and Latin America, the Apple Messages app is not as popular as it may be in countries such as the United States, however, more and more users prefer it as an alternative to communicate via instant messaging. Apple made great changes in iOS 10 with the arrival of the apps for Messages and the stickers, now introduces a new improvement that makes the difference with the previous version.
In the latest iOS 12.2 beta, a change has come that may seem minor, but makes a big difference. Apple has changed the codec and the frequency of the audios in the voice notes. Previously audios were AMR Codec at 8000 Hz, now they are Opus Codec @ 24000 Hz. In other words, they sound much better.
In the following tweet we can see a quick comparison of how it sounds in the old and new format:
As a detail, the Opus codec is the one used by other messaging apps such as WatsApp or Telegram. Its extension for the file is .caf This change has been introduced in iOS 12.2 beta 5 and it is expected that it will also reach the final version in a few weeks.
It should be noted that while the change leads to a considerable improvement in audio quality , it also leads to much larger file sizes. Messages automatically delete the audios after a while, so the problem will not be for storage, but for data if you have a lower data rate. In any case, it depends on the use you make of it and it doesn’t affect it as much as an image or a video can.