Method and apparatus for encoding/decoding an audio signal by using audio semantic information

An audio signal decoding method comprising:

• receiving a first bitstream of an encoded audio signal and a second bitstream indicating semantic information of the audio signal;
• determining at least one sub-band of the audio signal that is variably configured in the first bitstream of the audio signal, by using the second bitstream indicating the semantic information;
• and
• calculating an inverse-quantization step size and a scale factor with respect to the at least one sub-band, and inverse-quantizing the first bitstream based on the calculated inverse-quantization step size and the calculated scale factor.

An audio signal encoding apparatus comprising:

• a transform unit which transforms an audio signal into a signal of a frequency domain;
• a semantic information generation unit which extracts semantic information from the audio signal;
• a sub-band reconfiguration unit which variably reconfigures one or more sub-bands comprised in the audio signal by segmenting or grouping the one or more sub-bands bands using the extracted semantic information;
• and
• a first encoding unit which generates a quantized first bitstream by calculating a quantization step size and a scale factor with respect to a reconfigured sub-band of the one or more sub-bands.

An audio signal decoding apparatus comprising:

• a receiving unit which receives a first bitstream of an encoded audio signal and a second bitstream indicating semantic information of the audio signal;
• a sub-band determining unit which determines at least one sub-band of the audio signal that is variably configured in the first bitstream of the audio signal, by using the second bitstream indicating the semantic information;
• and
• a decoding unit which calculates an inverse-quantization step size and a scale factor with respect to the at least one sub-band, and inverse quantizes the first bitstream based on the calculated inverse-quantization step size and the calculated scale factor.