12. The non-transitory computer-readable medium of claim 11 , wherein encoding the energy of the LTP excitation component comprises encoding a gain factor.
14. The non-transitory computer-readable medium of claim 12 , wherein the method further comprises: limiting or reducing the value of the gain factor for the first subframe or the first two subframes to be smaller than 1; and compensating for coding quality loss due to the gain factor reduction by adding one more stage of excitation component to the second excitation component for the first subframe or the first two subframes rather than the other subframes within the frame.