Patent ID: 6944510
Filing Date: 2005-09-13
Classification: G10L

Abstract:
1. A method of time-scale modification processing of frame-based digital audio signals wherein, for each frame of predetermined duration comprising: the 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; characterised in that a profiling procedure is applied to the overlapping portions of the original and copied frame prior to cross correlation, which profiling procedure reduces the specification of the respective audio frame portions to respective finite arrays of containing less than 128 values, and the cross correlation is then performed in relation only to the pair of finite arrays of values.