Audio encoding method and apparatus audio decoding method and apparatus recoding medium and multimedia device employing the same

摘要

The audio encoding method includes obtaining an envelope in a predetermined subband unit with respect to an audio spectrum; Quantizing the envelope in units of the subbands; Obtaining a difference value between the quantized envelopes of adjacent subbands, and performing lossless encoding on the difference value of the current subband using the difference value of the previous subband as a context. According to this, the number of bits required to encode actual spectral components can be increased by reducing the number of bits required to encode envelope information of the audio spectrum in a limited bit range.