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| An ingenious signal analysis method
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Simultaneous masking and hearing threshold in the lower audible ranges are
used for quantization noise control in the frequency domain |
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Forward masking and backward masking are used for quantization noise control
in the time sequence domain |
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| Removal of data redundancy |
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Quantized data are efficiently coded applying Entropy Coding |
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| Optimal processing is performed on signals that change over time in each sub-band by splitting input signals into 4 sub-bands. |
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| Signal compression is performed with virtually no loss in sound quality by
setting the frequency resolution at 21.5Hz. In addition, a smaller area for the
transformation and frequency resolution processing is made possible by hybrid
processing using the band division filter. |
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Tonal signal isolation |
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Efficient bit allocation is performed by isolating tonal signals such as that
of trumpet or flute sounds, which have signal components that are unevenly distributed
throughout certain frequencies. |
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Coding table |
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Simple coding is achieved with less memory by using a smaller
coding table. |
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