FIELD: data processing.
SUBSTANCE: invention relates to encoding/decoding an audio signal corresponding to a high frequency band. Encoder comprises a processor for dividing the input frequency spectrum into low and high frequency band signals, determining whether the lowband signal is coded in the LP region and in the conversion area, and encoding a high frequency band signal in the time domain or frequency domain based on the characteristic of the input frequency spectrum when it is determined that the lowband signal is encoded in the LP region.
EFFECT: expansion of the high frequency range.
12 cl, 38 dwg
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