发明名称 |
AUDIO SIGNAL TIME SCALE MODIFICATION |
摘要 |
A method of time-scale modification processing of frame-based digital audio signals based on Synchronous Overlap Addition in which an original frame of digital audio is copied, the original and copied frames are partly overlapped to give a desired new duration to within a predetermined tolerance, the extent of overlap is adjusted within the predetermined tolerance by reference to a cross correlation determination of the best match between the overlapping portions of the original and copied frame; and a new audio frame is generated from the non-overlapping portions of the original and copied frame and by cross-fading between the overlapping portions. To reduce the computational load, a profiling procedure is applied to the original and copied frame prior to cross correlation, such as to reduce the specification of each audio frame portion (100) to a finite array of values (101-106), and the cross correlation is then performed in relation only to the pair of finite arrays of values. To further simplify computation, the values (101-106) are identified as maxima or minima for the signal and are both stored and processed as the only non-zero values in a matrix representation of the frame. A digital signal processing apparatus embodying this technique is also provided.
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申请公布号 |
WO0072310(A1) |
申请公布日期 |
2000.11.30 |
申请号 |
WO2000EP04430 |
申请日期 |
2000.05.15 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
BALLESTY, DARRAGH;GALLERY, RICHARD, D. |
分类号 |
H04N5/91;G10L21/04;G10L25/06;G11B20/10;(IPC1-7):G10L21/04;G06F17/15 |
主分类号 |
H04N5/91 |
代理机构 |
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主权项 |
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地址 |
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