The wideband &quot;hd audio&quot; codec was developed by telecom people in the 70s.  The problem with mobile is that the vocoder is trying to cope with a channel having 99% packet loss and latency variance 10x over the mean.  The width of the passband is the least of voice&#x27;s problems.<p>The solution to mobile voice&#x27;s problem is for the carriers to invest in a network that isn&#x27;t ludicrously oversold.