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Another way to split the speech band would be to divide it into equal widhtsub-bands and assign to each sub-band number of bits proportional to perceptu.significance while encoding them. Instead of partitioning into equal width band-octave band splitting is often employed. As the human ear has an exponential]decreasing sensitivity to frequency, this kind of splitting is more in tune with t‘perception process.There are various methods for processing the sub-band signals. One obvous way is to make a low pass translation of the sub-band signal to zero frquency by a modulation process equivalent to single sideband modulation. Th.
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