Patent ID: 8086446
Filing Date: 2011-12-27
Classification: G10L

Abstract:
1. A method of transforming an audio signal using an audio codec, comprising: filtering the audio signal into predetermined sample units; calculating a detected amount of change amount within each of plural sample units, of the predetermined sample units, and measuring a frame length between a frame point of a sample unit of the sample units and a frame point of another of the sample units that has a detected change amount that meets a predetermined threshold; determining an adaptive transform unit into which a corresponding portion of the audio signal is to be transformed into in a frequency domain to be a select frame type by comparing the measured frame length to a sum of lengths of two different types of frames, wherein the selected frame type has a different length than the sum of lengths of the two different types of frames; and transforming the audio signal into an audio signal in the frequency domain according to determined adaptive transform units.