METHOD AND APPARATUS FOR DETERMINING ENCODING MODE OF AUDIO SIGNAL, AND METHOD AND APPARTUS FOR ENCODING/DECODING AUDIO SIGNAL USING IT

摘要

A method and an apparatus for determining a coding mode of an audio signal and a method and an apparatus for encoding/decoding the audio signal by using the same are provided to adjust a mode determination reference value of a frame for determining the coding mode according to a long-term feature of the audio signal adaptively and determine the coding mode of a current frame to enhance a hit rate for coding mode determination and signal classification. A short-term feature generating unit(120) analyzes an audio signal by a frame unit and generates a short-term feature. A long-term feature generating unit(130) generates a long-term feature by using the short-term feature. A mode determination reference value adjusting unit(180) adaptively adjusts a mode determination reference value of a frame for judging a coding mode by using the long-term feature. A coding mode determining unit(190) determines a coding mode of the frame for determining the coding mode by using the adjusted mode determination reference value.