| 摘要 |
PCT No. PCT/EP90/01683 Sec. 371 Date Aug. 24, 1992 Sec. 102(e) Date Aug. 24, 1992 PCT Filed Oct. 8, 1990 PCT Pub. No. WO91/05412 PCT Pub. Date Apr. 18, 1991.The process disclosed enables the "time domain aliasing cancellation" method to be extended systematically to larger block overlapping. The boundary conditions which, when using various modified transforms, the analysis and synthesis windows must comply with, can thus be given. The transform series must also be included in the design of each analysis and synthesis window in order to optimize for a given application, because this changes the boundry conditions with which an analysis window function can be determined. Design for analysis and synthesis windows have shown that analysis and synthesis properties obtained by multiple block overlapping are significantly better than those obtained by convential double block overlapping. The systematic method of the invention offers numerous possibilites for optimizing windows in special applications. |
