Questions about sound issues with Ubuntu spanning from sound cards, microphones and speakers/headset to the transfer of audio signals via audio port, bluetooth and HDMI.

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Does Ubuntu for phones support the AMR-WB codec, aka HD Voice?

Normally the phone frequency is limited, ranging from 300 Hz to 3,4 kHz. Using the AMR-WB codec, speech is transmitted from 80 Hz to 7 kHz. See: https://en.wikipedia.org/wiki/Wideband_audio If ...