Patent ID: 9536530
Date: 2017-01-03
CPC Classifications: G10K,G10L

Claim:
1. Information signal reconstructor configured to reconstruct, using aliasing cancellation, an information signal from a lapped transform representation of the information signal comprising, for each of consecutive, overlapping regions of the information signal, a transform of a windowed version of the respective region, wherein the information signal reconstructor is configured to reconstruct the information signal at a sample rate which changes at a border between a preceding region and a succeeding region of the information signal from a first sample rate within the preceding region to a second sample rate, different from the first sample rate, within the succeeding region, the information signal reconstructor comprises a retransformer configured to apply a retransformation on the transform of the windowed version of the preceding region so as to acquire a retransform for the preceding region, and apply a retransformation on the transform of the windowed version of the succeeding region so as to acquire a retransform for the succeeding region, wherein the retransform for the preceding region and the retransform for the succeeding region overlap at an aliasing cancellation portion at the border between the preceding and succeeding regions; a resampler configured to resample, by interpolation, the retransform for preceding region and/or the retransform for the succeeding region at the aliasing cancellation portion according to a sample rate change at the border; and a combiner configured to perform aliasing cancellation between the retransforms for the preceding and succeeding regions as acquired by the resampling at the aliasing cancellation portion so as to reconstruct the information signal in a form sampled at the first sample rate within a portion of the retransform for the preceding region, preceding the aliasing cancellation portion, and sampled at the second sample rate within a portion of the retransform for the succeeding region, succeeding the aliasing cancellation portion.