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. An apparatus for encoding a frequency band, the apparatus comprising:
a time domain encoding unit to encode a first frequency band by using an excitation signal of a second frequency band that has a lower frequency range than a predetermined frequency band when the first frequency band is in a time domain; and a frequency domain encoding unit to encode the first frequency band by using a decoded spectrum of the second frequency band when the first frequency band is in a frequency domain.