Audio signal encoding method and apparatus and audio signal decoding method and apparatus using psychoacoustic-based weighted error function

An audio signal encoding method performed by an audio signal encoding apparatus to which a neural network is applied, the method comprising:

• receiving an input audio signal;
• generating a latent vector that could have a reduced dimension, of the input audio signal based on a parameter of a hidden layer learned using the neural network, wherein the neural network includes at least one hidden layer;
• and
• encoding the latent vector and outputting a bitstream.

An audio signal decoding method performed by an audio signal decoding apparatus to which a neural network is applied, the method comprising:

• receiving a bitstream obtained by encoding a latent vector that is generated by applying a parameter learned through the neural network to an input audio signal;
• restoring the latent vector from the received bitstream;
• and
• decoding an output audio signal from the restored latent vector using a hidden layer to which the learned parameter is applied, wherein the neural network includes at least one hidden layer.