"G.722 sample audio data at a rate of 16 kHz (using 14 bits), double that of traditional telephony interfaces, which results in superior audio quality and clarity." - This is unclear. Increasing sample rate above Nyquist-frequency makes for cheaper implementation, not for "superior audio quality". — Preceding unsigned comment added by 78.53.77.220 (talk) 10:10, 24 January 2013 (UTC)Reply

Human voice contains frequencies way above 4kHZ, so G.711 is way below what is required for high quality speech. Also dynamic range is superior in G.722, which further improves clarity. And I'm pretty sure higher sampling rate, especially with the higher algorithmic complexity is going to (or used to) cost more, unless you try to compensate for G.711's lower quality with expensive algorithms and then end up requiring a more expensive DSP, although in the general case I can't see an implementation of either differ in cost with today's hardware. Even the cheapest 8bit microcontroll you can buy should have no problem with G.722.