AUDIO-ENCODING METHOD AND APPARATUS, AUDIO-DECODING METHOD AND APPARATUS, RECORDING MEDIUM THEREOF, AND MULTIMEDIA DEVICE EMPLOYING SAME

摘要

According to the present invention, an audio-encoding method comprises the steps of: for an audio spectrum, acquiring an envelope on a predetermined sub-band basis; quantizing the envelope on said sub-band basis; and obtaining a difference value between quantized envelopes of an adjacent sub-band, and performing lossless encoding on the difference value of the current sub-band using, as a context, the difference value of the previous sub-band. According to the present invention, the number of bits used for encoding envelope information of an audio spectrum in a limited bit range may be reduced, thereby increasing the number of bits used for encoding actual spectrum components.