I'm learning a few things about codec, and now I'm confused by G.722. There's a way to calculate codec bit rate that I read here on wikipedia.

It said: bit rate = sampling rate x bit depth

G.722 has 16 kHz sampling rate and 14 bit depth. If I calculate them accurately, G.722 has 224 kbps bit rate.

16 x 14 = 224

But another wikipedia article said that G.722 has 64 kbps bit rate.

How is that possible? I've googled through this matter and got nothing.