METHOD AND APPARATUS FOR ADAPTIVELY ENCODING AND DECODING HIGH FREQUENCY BAND

摘要

Provided are a method and apparatus for encoding and decoding an audio signal. According to the present application, a signal of a high frequency band above a preset frequency band is adaptively encoded or decoded in the time domain or in the frequency domain by using a signal of a low frequency band below the preset frequency band. As such, the sound quality of a high frequency signal is not deteriorate even when an audio signal is encoded or decoded by using a small number of bits and thus coding efficiency may be maximized.

主权项

1. A method of synthesizing an upper band, the method comprising:
reconstructing, performed by using a processor, a high band signal based on a decoded excitation signal of a low band, when it is determined that extension to a high band above a preset frequency is performed in a time domain; and reconstructing the high band signal based on an envelope obtained from a received bitstream, when it is determined that the extension to the high band is performed in a frequency domain.