Patent ID: 9135925
Filing Date: 2015-09-15
Classification: G10L,G11B,H03G

Abstract:
1. An apparatus for improving speech signal of a speech codec comprising, wherein the speech codec includes a low-band codec: an energy calculation unit configured to calculate an energy of the speech signal decoded by the low-band codec: a scaling unit configured to scale the size of the decoded speech signal by a gain that is less than 1; and wherein the gain is based on energies of current and previous frames of the low-band decoded speech signal, wherein the scaling unit determines whether to perform scaling based on the power of a low-band and high-band decoded speech signal, wherein the low-band decoded speech signal is a signal decoded by a low-band codec when a low-band enhancement mode is disabled, wherein the low-band codec uses a G.711 codec, wherein the scaling unit performs the scaling in a silent segment, and wherein the energy calculation unit calculates the energy of the low-band decoded speech signal in units of frames, an energy of one of the frames is calculated by summing energies of samples.