AMR calls the whole circuit 'Class X', because it's neither pure Class A, nor AB throughout. For an aspirational integrated amplifier, the AM-77 is unusually highly featured - for instance, it has ...
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.
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