The Analogue Filters for Digital Signals

The Analogue Filters for Digital Signals

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The process of filtering an analog signal removes all frequencies above or below a corner frequency, passing only a band of frequencies, or rejecting a band of frequencies. In the design of analogue filters for the pre-processing of digital signals the filter parameters need to be chosen with respect to the spectral components of the signal being filtered. When digital signals are filtered, however, a totally different set of constraints applies. The paper points out the connection between the choice of cut-off frequency and the shape of the spectrum of processed signal. The design of a new type of filter for data transmission with 4B3T coding is shown. A computer simulation of the chosen filter is performed and the filter spectra prior and subsequent to filtering are compared.

The process of filtering an analog signal removes all frequencies above or below a corner frequency, passing only a band of frequencies, or rejecting a band of frequencies. In the design of analogue filters for the pre-processing of digital signals the filter parameters need to be chosen with respect to the spectral components of the signal being filtered. When digital signals are filtered, however, a totally different set of constraints applies. The paper points out the connection between the choice of cut-off frequency and the shape of the spectrum of processed signal. The design of a new type of filter for data transmission with 4B3T coding is shown. A computer simulation of the chosen filter is performed and the filter spectra prior and subsequent to filtering are compared.

filtering, filter, digital signal

filtering, filter, digital signal

Mišurec, J. Zeman, V.

10.09.2005

80-248-0897-8

Proceedings of international Conference Research in Telecommunication Technology

2005

63

6