13. The apparatus of claim 12 wherein the speech coder comprises a CodeExcited Linear Prediction (CELP) coder, wherein the speech parameters include one or more excitation gain parameters and one or more linear predictive coding (LPC) coefficient parameters, and wherein the energy estimator of the one or more reference speech energy levels and the energy estimator of the target speech energy level each estimate both an excitation energy level and a LPC synthesis filter energy level.
13. The apparatus of claim 12 wherein the speech coder comprises a CodeExcited Linear Prediction (CELP) coder, wherein the speech parameters include one or more excitation gain parameters and one or more linear predictive coding (LPC) coefficient parameters, and wherein the energy estimator of the one or more reference speech energy levels and the energy estimator of the target speech energy level each estimate both an excitation energy level and a LPC synthesis filter energy level. 14. The apparatus of claim 13 wherein the CELP coder comprises an Enhanced Variable Rate Codec (EVRC).