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Bitrate Reduction of High Quality Audio Signals by Modeling the Ears Masking Thresholds

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Since few years there are some different source-coding systems for high quality audio signals (CD-quality) which exploit the redundancy and irrelevancy of speech and music signals for an efficient data-reduction. Psychoacoustic research is the basis for the subband coding system MUSICAM (Masking-pattern Universal subband Integrated Coding and Multiplexing), which was developed in cooperation of french, dutch and german scientists. During the development different coding and sound analyzing strategies were used and combined to optimize this system. A combination of two analysis methods, subband and transform, seems to be the best strategy to achieve the highest reduction of the bit-rate. Subband samples are coded using a bit-allocation, which is mainly derived from the spectral values of a Fourier transform. For the synthesis in the decoder only the subband method is used.

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