Signal processing apparatus, signal processing method, and program

A signal processing method to be performed by a signal processing apparatus, the signal processing method comprising:

• generating, on a basis of an input signal and a prediction coefficient that is acquired by learning with, as training data, a difference signal based on a re-quantized signal for learning acquired by re-quantization of an original sound signal and the original sound signal, the difference signal corresponding to the input signal;
• and
• combining the difference signal generated and the input signal.

A program for causing a computer to perform processing comprising:

• a step of generating, on a basis of an input signal and a prediction coefficient that is acquired by learning with, as training data, a difference signal based on a re-quantized signal for learning acquired by re-quantization of an original sound signal and the original sound signal, the difference signal corresponding to the input signal;
• and
• a step of combining the difference signal generated and the input signal.