Patent ID: 7065491
Filing Date: 2006-06-20
Classification: G10L

Abstract:
1. A method for an inverse-modified discrete cosine transform and overlap-add for MPEG Layer3 audio signal decoding, comprising the steps of: applying an operation of the inverse-modified discrete cosine transform and overlap-add according to equation (1) to 32 sub-band samples of a compressed audio signal, wherein the equation (1) includes an inverse-modified discrete cosine transform: Wherein for I and k=0 to n−1 and an overlap-add: where X(k) is the sub-band sample, Z(i) is the sub-band sample after process, when a window type is 0, 1, 3, n equals 36, and when the window type is 2, n equals 12; providing a dynamic window inverse-modified discrete cosine transform (DWIMDGT) module, wherein a multiplier-adder of the dynamic window inverse-modified discrete cosine transform module processes an operation of the inverse-modified discrete cosine transform, and an operation result of the inverse-modified discrete cosine transform is stored in a register stack of the dynamic window inverse-modified discrete cosine transform module; and using the multiplier-adder to operate the overlap-add operation, and an operation result of the overlap-add is stored in a dynamic window inverse-modified discrete cosine transform buffer memory.