Frame error concealment method and apparatus, and audio decoding method and apparatus

A frame error concealment method comprising:

• receiving a bitstream of an audio signal;
• if it is determined that a current frame in the audio signal is an error frame, predicting, performed by at least one processor, a first parameter of a group in the current frame, based on a regression analysis on a second parameter of a corresponding group in a plurality of previous frames;
• obtaining a gain of the group in the current frame from the predicted first parameter of the group in the current frame and the second parameter of the corresponding group in the plurality of previous frames;
• generating spectral coefficients of the group in the current frame from spectral coefficients of the group in at least one previous frame among the plurality of previous frames, based on the obtained gain of the group in the current frame;
• inverse-transforming the generated spectral coefficients of the group in the current frame;
• and
• reconstructing the audio signal based on the inverse-transformed spectral coefficients of the group in the current frame,
• wherein the group in the current frame is arranged corresponding to the group in the plurality of previous frames and the group in the current frame and the corresponding group in the plurality of previous frames include an identical number of sub-bands,
• wherein the sub-bands include a plurality of spectral coefficients in a specific frequency range, respectively, and
• wherein the first parameter of the group in the current frame is an average norm value of the sub-bands included in the group in the current frame, and the second parameter of the corresponding group in the plurality of previous frames is an average norm value of the sub-bands included in the corresponding group in the plurality of previous frames.