Method for determining a quantization step adaptively according to masking effect in psychoacoustics model and encoding/decoding audio signal using the quantization step, and apparatus thereof

摘要

The invention psychoacoustic model of the masking effect (masking effect) A method of determining the quantization interval is adaptively in accordance with and relates to an encoding / decoding method of an audio signal using the same, the audio for the threshold of masking effect from the input audio signal, by calculating a first ratio value representing the intensity of the signal and based on a first ratio value, by determining a quantization interval with a maximum value within the range in which the noise is masked to occur according as the quantized audio signal , while using the hearing characteristic of the person removing the quantization noise is the number of bits required for encoding is capable of reducing the effect