Abstract
Disclosed are an apparatus and a method for encoding/decoding for high-frequency bandwidth extension. The coding method comprises determining a core coding mode of a low-frequency signal of an input signal, based on characteristics of the low-frequency signal of the input signal, quantizing a linear prediction coefficient (LPC) from the low-frequency signal of the input signal. The method includes performing code excited linear prediction (CELP) coding on an LPC excitation signal of the low-frequency signal of the input signal when the core coding mode of the low-frequency signal of the input signal is determined to be a CELP coding mode. The method includes performing time-domain (TD) extension coding on a high-frequency signal of the input signal when the CELP coding is performed on the LPC excitation signal. The method includes performing audio coding on the LPC excitation signal when the core coding mode of the low-frequency signal of the input signal is determined to be an audio coding mode. The method includes performing frequency-domain (FD) extension coding on the high-frequency signal of the input signal when the audio coding is performed on the LPC excitation signal.
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