| 摘要 |
According to the present invention, there is developed a proprietary technology for compressing the window tables of audio coders to 1/8 their original size (or less) without any loss of quality. This technology can be applied to all transform based audio coders, or any audio coder that uses a windowing stage. The novel technique for reducing storage requirements for the window tables of audio coders is based on multiple differentiation. Since the difference between any two adjacent samples in the first difference signal is small, so it is more efficient to store this difference. This technique can be carried out several more times, until the returns get smaller, and the computational requirements to "undo" the compression go up. The optimum number of times to differentiate is dependent on the particular application and the window shape.
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