Encoding apparatus, decoding apparatus and methods thereof

An encoding apparatus that performs band enhancement using a low-band side spectrum and generates a high-band side spectrum, the encoding apparatus comprising:

• a band setter that inputs an input signal of a frequency domain and uses a characteristic of the input signal of the frequency domain as a basis, or inputs the input signal of the frequency domain and a coding parameter and uses at least one of the coding parameter and a characteristic of the input signal of the frequency domain as a basis, for generating band setting information that decides a first band of a high-band side set by the band enhancement;
• and
• a high-band encoder that encodes the input signal of the first band decided based on the band setting information and generates high-band part coded information,
• wherein the band setter compares energy of the input signal of a low-band side arbitrary third band within the frequency domain of the input signal and energy of the input signal of a fourth band of a higher-band side than the third band, and generates the band setting information that decides the first band based on a comparison result.

An encoding apparatus that performs band enhancement using a low-band side spectrum and generates a high-band side spectrum, the encoding apparatus comprising:

• a band setter that inputs an input signal of a frequency domain and uses a characteristic of the input signal of the frequency domain as a basis, or inputs the input signal of the frequency domain and a coding parameter and uses at least one of the coding parameter and a characteristic of the input signal of the frequency domain as a basis, for generating band setting information that decides a first band of a high-band side set by the band enhancement;
• and
• a high-band encoder that encodes the input signal of the first band decided based on the band setting information and generates high-band part coded information,
• wherein the band setter generates the band setting information that decides the first band and a low-band side second band by dividing the frequency domain into the first band and the second band,
• wherein the band setter compares energy of the input signal of a low-band side third band within the frequency domain of the input signal and energy of the input signal of a fourth band of a higher-band side than the third band, and generates the band setting information that decides the first band and the second band based on a comparison result.