1. A speech signal encoding method comprising the steps of: specifying an analysis frame in an input signal; generating a modified input based on the analysis frame; applying a window to the modified input; generating a transform coefficient by performing an MDCT (Modified Discrete Cosine Transform) on the modified input to which the window has been applied; and encoding the transform coefficient, wherein the modified input includes the analysis frame, and a self replication of all or a part of the analysis frame.