[ EFR / HFR enabling and disabling ]
A Nokia 3210 is capable to switch between 2 kinds of sound quality, both have their own benefits. This include sound quality increase or battery life increase:
EFR (default)
In this mode, your phone has a sound quality near normal phone quality. You almost won't hear any 'sissing' noise and the receiver (other side) hears your voice and even background noise clearly. This is the default setting.
As you surely know (just stating this as "general info") Erbium doped fiber amplifiers are a special kind of fiber, where erbium atoms mediate transfer of energy from an optical "pump" signal to the signal that needs amplification. This is a purely optical operation, save for the state change in the erbium atoms. But shouldn't this provide as fast response as the gas laser proposed in another thread of the discussion?
"Right now I feel that I've got my feet on the ground as far as my head is concerned." -- Baseball pitcher Bo Belinsky
