Audio encoding method and apparatus, audio decoding method and apparatus, and multimedia device employing the same

摘要

A method of encoding an audio signal includes generating a modified signal of a time domain to compensate a frequency resolution in frame units, analysis-windowing the modified signal of the time domain by using a window type which is designed to have an overlapping section less than 50%, and generating transform coefficients of a frequency domain by transforming the analysis-windowed signal of the time domain. A method of decoding an audio signal includes restoring a frequency resolution by demerging frequency bins in sub-band units for a signal in a frequency domain which is decoded from a bitstream, inverse-transforming the resolution-restored signal in the frequency domain into a signal in a time domain, and synthesis-windowing the signal in the time domain by using a window type which is designed to have an overlapping section less than 50%.