| 摘要 |
A filter device is for use in a digital communications receiver. The filter device processes an incoming signal from a digital transmitter having a first filter response providing a first spectral pulse shape in frequency space. The filter device has a second filter response having a more rapid cut-off than the first filter response and provides when applied to the first spectral pulse shape an output signal comprising a second spectral pulse shape in frequency space selected to substantially minimize inter-symbol interference. The second spectral shape may also be selected to substantially minimize adjacent-channel noise. A receiver and a communications system incorporating the filter device and a method of filtering in a receiver are also described.
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