APPARATUS AND METHOD FOR CODING AUDIO SIGNAL BY SWITHCING TRANSFORM SCHEME AMONG FREQUENCY DOMAIN TRANSFORM AND TIME DOMAIN TRANSFORM

摘要

There is provided an audio signal encoder for encoding an audio signal by switching between a time domain transform technique and a frequency domain transform technique, and an audio signal decoder for decoding a coded audio signal by switching between a defective area attack technique and a frequency domain transform technique. In case of switching from any one of the time domain transform techniques or the frequency domain transform techniques to other transform techniques, the audio signal before and after the conversion may be further encoded using the further converted audio signal, or the encoded audio signal may be decoded. Various embodiments are also provided for reducing the amount of audio signal to be additionally converted.