Patent ID: 9508355
Filing Date: 2016-11-29
CPC Classification: G10L

Claim Text:
1. A method of encoding an audio signal, the method comprising: segmenting the audio signal into a plurality of frames, wherein each of the frames includes M samples and M is a natural number greater than one; applying a first window, a second window, and at least one third window to the frames, wherein a length of the second window is longer than a length of the first window, and a length of the at least one third window is longer than the length of the first window and shorter than the length of the second window; time-frequency transforming the frames to which the first window, the second window, and the at least one third window have been applied; and generating a bitstream including the time-frequency transformed frames, wherein each of the second window and the at least one third window includes a first zero duration and a second zero duration in which a coefficient is zero, and a first unity duration and a second unity duration in which a coefficient is one, and a length of the first zero duration, the second zero duration, the first unity duration, and the second unity duration is determined to satisfy a perfect reconstruction condition.