The low frequency range being lower than the high frequency range, wherein said splitter applies a low-pass filter to the transmission signal to generate the low frequency signal, wherein said splitter determines a difference between the low frequency signal and the delayed transmission signal to generate the high frequency signal, a first coder for deriving a first coded signal within the first frequency range from the low frequency signal, and
a second coder for deriving a second coded signal within the high frequency
range from the high frequency signal.
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dwella