| 摘要 |
FIELD: information technology.SUBSTANCE: apparatus for encoding an audio signal includes a windower (11) for windowing a first block of the audio signal using an analysis window, the analysis window having an aliasing portion and a further portion; a processor (12) for processing a first sub-block of the audio signal associated with the aliasing portion by transforming the first sub-block from the domain to another domain, subsequent to windowing the first sub-block to obtain a processed first sub-block, and for processing a second sub-block of the audio signal associated with the further portion by transforming the second sub-block from the domain to another domain before windowing the second sub-block to obtain a processed second sub-block. The apparatus also includes a transformer (13) for converting the processed first sub-block and the processed second sub-block from the different domain into a further domain using the same block transform rule to obtain a converted first block, which is compressed using any of the known data compression algorithms. Therefore, critically sampled switching between two encoding modes is obtained since aliasing portions of the analysis window that appear in two different domains are suited to each other.EFFECT: improved concept of encoding and decoding at low transmission speed with high quality.17 cl, 20 dwg |
