| 摘要 |
Provided are a method of adaptively determining a quantization step according to a masking effect in a psychoacoustics model and a method of encoding/decoding an audio signal by using the determined quantization step. The method of adaptively determining a quantization step includes calculating a first ratio value indicating an intensity of an input audio signal with respect to a masking threshold; and determining the maximum value of the quantization step in a range in which noise generated when the audio signal is quantized is masked, according to the first ratio value. According to the present invention, quantization noise may be removed and the number of bits required to encode an audio signal may be reduced, by using auditory characteristics of humans. |
