3. The method of claim 1 , wherein each encoder mode has a predetermined bit rate.
3. The method of claim 1 , wherein each encoder mode has a predetermined bit rate. 4. The method of claim 3 , wherein said CELP encoder mode is associated with a bit rate of about 8500 bits per second, said PPP encoder mode is associated with a bit rate of about 3900 bits per second, and said NELP encoder mode is associated with a bit rate of about 1550 bits per second.