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Its funny. There is HDTV, HD radio, high speed Internet, and yet the phone system still operates at 8 KHz! Why?
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I'd guess sunk costs in old infrastructure.
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voice requires barely any quality/bitrate to understand. Just look at Speex/Opus
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probably because digital can be knocked out by a solar flare, volcanic eruption, heavy rain so they still need a form of communication that isn't effected by these and other natural effects.
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