SIGNAL ENCODING METHOD AND APPARATUS AND SIGNAL DECODING METHOD AND APPARATUS

摘要

A spectrum encoding method may comprise the steps of: quantizing spectrum data of the current band according to a first quantization method; generating lower bits of the current band by means of the spectrum data and quantized spectrum data; quantizing the lower bit sequence, comprising the lower bits of the current band, according to a second quantization method; and generating a bit stream on the basis of the upper bit sequence, excluding N bits (where N is 1 or greater) from among the quantized spectrum data, and quantized lower bit sequence.