Encoding method, decoding method, encoder for performing encoding method, and decoder for performing decoding method

A decoding method comprising:

• outputting quantized LP coefficients, a first quantized latent signal, a second quantized latent signal, and a quantized weight vector by de-quantizing LP coefficients bitstream, a first bitstream, a second bitstream, and a weight bitstream, respectively using a de-quantization module;
• outputting a first decoded residual signal obtained by decoding the first quantized latent signal and a second decoded residual signal obtained by decoding the second quantized latent signal, using a second neural network module;
• reconstructing a residual signal using the first decoded residual signal, the second decoded residual signal, and the quantized weight vector;
• and
• synthesizing an output signal by feeding the reconstructed residual signal into an LP synthesis filter constructed by the quantized LP coefficients.

An encoder comprising:

• a processor,
• wherein the processor is configured to:
• output LP coefficients bitstream and a residual signal by performing an LP analysis on an input signal, using an LP analysis module;
• output a first latent signal obtained by encoding a periodic component of the residual signal, a second latent signal obtained by encoding a non-periodic component of the residual signal, and a weight vector for each of the first latent signal and the second latent signal, using a first neural network module;
• and
• output a first bitstream obtained by quantizing the first latent signal, a second bitstream obtained by quantizing the second latent signal, and a weight bitstream obtained by quantizing the weight vector, using a quantization module.

The encoder of claim 10, wherein the processor is configured to:

• calculate LP coefficients for the input signal, using LP coefficients calculator;
• output the LP coefficients bitstream by quantizing the LP coefficients using an LP coefficients quantizer;
• output quantized LP coefficients by de-quantizing the LP coefficients bitstream using an LP coefficients de-quantizer;
• and
• calculate the residual signal by feeding the input signal into an LP analysis filter constructed by the quantized LP coefficients.