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This paper addresses the combination of a low delay subband ADPCM-based audio codec with adaptive pre- and post-filtering for psychoacoustic noise shaping. We present how our basic scheme for error robust subband coding can be combined with two cascades of band shelving filters. The gain parameters of these filters are adapted by an algorithm that is based on power estimates which are obtained from...
This paper presents an extension and global optimization of a bit-allocation strategy for use in a low delay subband ADPCM-based audio coding scheme. The framework employed for the assignment of bits to subband quantizers is based on a subband level estimation of the signals used for the prediction error normalization. It is modified to reduce switching artifacts and extended to contain a mapping...
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