Method for coding audio signal

PURPOSE: A method for coding audio signals is provided to be capable of reducing the number of calculation in a coding method considering an audio characteristic. CONSTITUTION: A method for coding audio signals includes a mapping unit(10) for sampling audio signals in a time region, blocking them into blocks of a given size and converting them into signals in a frequency region divided into critical bands. A bit allocation unit(12) determines the number of quantization bits of the signals in the frequency region divided into critical bands depending on an audio characteristic of human. A quantization unit(14) processes the signals of the frequency region depending on the number of allocated quantization bits. A data compression unit(16) compresses the signals of the quantized frequency region.