MATERIAL-B-COMPLEX TRANSFORM WITH LOW DELAY IN BANKS OF FILTERS WITH OVERLAPPING FOR PARTIAL COMPLEX PROCESSING

摘要

1. An audio processing system (600; 700) comprising a multiband filter (660; 770) to provide a partially integrated representation of a signal in the frequency domain, the multiband filter comprising: a synthesis stage (691; 710; 810, 870) receiving a first subband band the first representation of the signal in the frequency domain, the first representation in the frequency domain being segmented into time blocks and contains the first components of the spectrum representing the spectral composition of the signal in the first subband range expressed in the first subpro multidimensional space, and deriving, on the basis of the first subband range, an intermediate representation of the signal in the time domain; an analysis cascade (693; 720; 820, 880), receiving an intermediate representation of the signal in the time domain and deriving, on its basis, a second representation of the signal in the frequency domain moreover, the second representation in the frequency domain is segmented into time blocks and contains the second components of the spectrum, representing the spectral composition of the signal in the first subband range, expressed in the second subspace of multidimensional space, which includes a part of multidimensional space not included in the first subspace; a processor (640; 740; 860) that receives the first and second subband ranges of the first signal representation in the frequency domain and the second signal representation in the frequency domain and combines them to derive a partially complex representation of the signal in the frequency domain, wherein: the synthesis cascade is configured to issuing an approximate value of the intermediate representation in the time domain in the time block, p