|reply to wmcbrine |
Re: 12 KBs?
It's more than the bit rate; it's the sampling rate.
HD voice samples and delivers sound at 7 kHz and higher. A stock PSTN analog phone call samples/delivers sound at about 3 kHz, cutting off a lot of the upper and a bit of the lower range of sound you hear in "normal" speech.
G.722 is the baseline standard for HD voice for broadband, while AMR-WB has become the standard on mobile phones.