Patent ID: 9640190
Date: 2017-05-02
CPC Classifications: G10L

Claim:
1. A decoding method, comprising: a speech decoding step of obtaining a current frame of a decoded speech signal from an input code; a noise generating step of generating a noise signal that is a random signal; and a noise adding step of outputting a noise-added signal, the noise-added signal being obtained by summing said decoded speech signal and a signal obtained by performing, on said noise signal, a signal processing that is based on a spectrum envelope corresponding to the decoded speech signal for the current frame, wherein the spectrum envelope corresponding to the decoded speech signal for said current frame is a spectrum envelope obtained by dulling a spectrum envelope corresponding to a linear predictive coefficient for the current frame provided in said speech decoding step, wherein the dulling operation is an operation which operates a predetermined constant to the linear predictive coefficient for the current frame.